Which of the following is/are FALSE about the cell membrane, which is made largely of a selectively permeable lipid bilayer?
a.
BOTH “Nothing can move (“net” movement) through the membrane against its concentration gradient unless an appropriate transport protein is present” AND “Everything can pass directly through the lipid bilayer.” ARE FALSE STATEMENTS
b.
Everything can pass directly (without any protein assistance) through the lipid bilayer
c.
Some materials can pass through the lipid bilayer portion of the cell membrane without a specific transport protein.
d.
Small ions cannot pass directly (without any protein assistance) through the lipid bilayer
e.
Nothing can move (“net” movement) through the membrane against its concentration gradient unless an appropriate transport protein is present.
Answers
The FALSE statement is, "Everything can pass directly (without any protein assistance) through the lipid bilayer." Option b is correct.
The cell membrane is a selectively permeable barrier that surrounds the cell, regulating the movement of substances in and out of the cell. The membrane is primarily composed of a lipid bilayer, which creates a hydrophobic barrier to polar or charged substances, making it difficult for them to cross the membrane without the help of transport proteins.
While small non-polar molecules, such as oxygen and carbon dioxide, can pass directly through the lipid bilayer, larger or charged molecules require transport proteins to facilitate their movement. It is also true that nothing can move against its concentration gradient without an appropriate transport protein, while some materials can pass through the lipid bilayer without a specific transport protein. Option b is correct.
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Related Questions
Do acids increase the proportion of hydrogen ions
Answers
Answer: Yes
Explanation:
Acids are substances that release hydrogen ions when dissolved in water. The concentration of hydrogen ions can vary significantly, and acidity is expressed on a logarithmic scale called the pH scale. A low pH value indicates a high concentration of hydrogen ions, making the solution acidic, while a high pH value indicates a low concentration of hydrogen ions, making the solution basic or alkaline.
The strength of an acid depends on how readily it donates hydrogen ions. For example, when hydrochloric acid (HCl) is dissolved in water, it completely dissociates into hydrogen and chloride ions. In contrast, weak acids, such as carbonic acid (H2CO3), only partially dissociate, with some hydrogen ions remaining bound within the acid molecule.
When an acid is added to a solution, the balance between hydrogen ions and hydroxide ions (OH-) shifts, resulting in an increase in hydrogen ion concentration and a decrease in pH. This increase in hydrogen ions makes the solution more reactive and acidic.
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What is a substrate? a molecule that acts as a catalyst a place where the reaction occurs a place on the product where the enzyme fits a reactant that is catalyzed by an enzyme
Answers
Answer:
a reactant that is catalyzed by an enzyme
Explanation:
Reactants are often referrred to as substrates as those are what enzymes mostly act upon to create products or some desired consequence
Option (d). a reactant that is catalyzed by an enzyme is called the substrate.
SubstrateA substrate exists as a molecule on which an enzyme acts. Enzymes catalyze chemical reactions that concern substrate, where the substrate binds to the enzyme's active site, and an enzyme-substrate complex is created. By action of the enzyme, the substrate exists transformed into a product, released from the active site, and free to obtain another substrate.
Enzyme catalysis exists as the increase in the rate of a process by a biological molecule, an "enzyme". Most enzymes exist in proteins, and most such processes are chemical reactions. Within the enzyme, naturally, catalysis happens at a localized site, called the active site.
The reactant in an enzyme-catalyzed reaction is named a substrate.
Because enzymes can expand reaction rates by enormous factors (up to 1017 times the uncatalyzed rate) and tend to be very precise, typically producing only a single product in quantitative yield, they exist the focus of active research.
Hence, Option (d). a reactant that is catalyzed by an enzyme is called the substrate.
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In the northern hemisphere, in what direction do the planetary wind belts shift towards in the winter?
Answers
Answer:
the wind belts would usaully shift counter clockwise in the norther hemishphere.
Explanation:
this is because the earth rotates making the coriolis effect
the meaning of photosynthesis in paragraph
Answers
Photosynthesis is a biological process that occurs in plants, algae, and some bacteria. It is the process by which these organisms convert light energy from the sun into chemical energy in the form of glucose (a type of sugar).
please help to know this question
Answers
Answer:
spontaneous generation is the correct answer
Explanation:
Check all that are true of the following scenario.
An archer strings an arrow on a bow and draws the string back. Aiming the bow
upwards at a 45 degree angle, the archer pauses with arms locked into position and
then releases the string. The arrow flies upwards making an arc and then sticks into
the trunk of a tree with an audible thud.
At least four different types of energy are illustrated in this example.
The first energy transformation in the scenario is chemical energy to kinetic.
From the time the archer draws the bow until the thud us heard, entropy increases in
the universe.
The energy of the arrow at the end of the scenario is equal to the energy exerted by the
muscles of the archer.
When the arrow sticks into the tree the original energy has all been used up.
Answers
Statements 1 and 3 are true, while statements 2 and 4 are false.The first energy transformation in the scenario is chemical energy to kinetic. - True.
The archer converts chemical energy stored in their muscles into kinetic energy when they release the string and propel the arrow forward.From the time the archer draws the bow until the thud is heard, entropy increases in the universe. - False. Entropy is a measure of disorder or randomness in a system. In this scenario, the archer's actions do not necessarily lead to an increase in entropy.
The energy of the arrow at the end of the scenario is equal to the energy exerted by the muscles of the archer. - False. Energy is conserved in a closed system, but some energy is lost as heat and sound during the process. Therefore, the energy of the arrow at the end may be less than the energy exerted by the archer's muscles.
When the arrow sticks into the tree, the original energy has all been used up. - False. Energy is not created or destroyed but rather transformed from one form to another. Some of the initial energy from the archer's muscles is transferred to the arrow's kinetic energy, but it is not entirely used up.In summary, statements 1 and 3 are true, while statements 2 and 4 are false.
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The nucleus contains which of the following?
Answers
Answer:
DNA
Explanation:
The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes.
The Drosophila genes for white eyes (w), cut wings (ct), and tan body (t) lie at map positions 2.00, 15.0, and 21.0, respectively. Of 1000 progeny, 7 are double crossovers. What is the degree of interference
Answers
Answer:
The coefficient of interference, I, is 0.1 (10% expressed as a percent)
Explanation:
Available data:
genes for white eyes (w), cut wings (ct), and tan body (t) lie at map positions 2.00, 15.0, and 21.0, respectivelyOf 1000 progeny, 7 are double crossovers.The coefficient of interference, I, is complementary with CC.
I = 1 - CC
To calculate the coefficient of coincidence, CC, we must use the next formula:
CC= observed double recombinant frequency/expected double recombinant frequency
Note:
observed double recombinant frequency=total number of observed double recombinant individuals/total number of individuals expected double recombinant frequency: recombination frequency in region I x recombination frequency in region II.By knowing the positions of genes, we can estimate the distances in MU between them per region.
The distance between w and ct genes is 15 - 2 = 13 MUThe distance between ct and t genes is 21 - 15 = 6 MUNow that we know the distances, we can estimate the recombination frequencies by dividing each distance by 100.
recombination frequency of w-ct region = 13MU / 100 = 0.13recombination frequency of ct-t region = 6MU / 100 = 0.06Now that we know the recombination frequencies in each region, we can calculate the expected double recombinant frequency, EDRF, like this:
EDRF = recombination frequency in region I x recombination frequency in region II.
EDRF = 0.13 x 0.06 = 0.0078
Now, by knowing the total number of individuals in the progeny (1000) and the number of double crossovers (7), we can calculate the observed double recombinant frequency, ODRF:
ODRF = number of double crossovers / total number of individuals
ODRF = 7/1000 = 0.007
Finally, with the values of EDRF and ODRF, we can calculate the coefficient of coincidence, CC.
CC = ODRF/EDRF
CC = 0.007 / 0.0078
CC = 0.9
And by knowing the CC we can also get the coefficient of interference, I.
I = 1 - CC
I = 1 - 0.9
I = 0.1 = 10% (expressed as a percent)
An amino acid's unique characteristics is defined by the ________.
Answers
First, you introduce to the parents the importance of karyotype test, by describing its ability to detect two broad categories of abnormalities in chromosomes, (1)______________________ and (2)_______________________. You provide a few examples of genetic disorders that can be caused by chromosomal abnormalities, such as (3)_________________________ and (4)_____________________. Some parents would like to know what is the main cause of these genetic disorders. Without going into too much detail, you explain to them that chromosomal abnormalities are usually caused by (5) ____________________ in meiosis I and meiosis II, when the homologous chromosomes or sister chromatids fail to separate during meiotic cell division.
Answers
Answer:
Abnormalities in Chromosomes
1. Numerical
2. Structural
3. Down Syndrome
4. Turner Syndrome
5. Disorder or Error
Explanation:
Numerical chromosome abnormalities occur due to extra or missing chromosomes. Structural chromosome abnormalities occur due to the irregular formation or rearrangement of the chromosomal DNA, normally called translocation. Down syndrome occurs with extra chromosomes, more than 46. Turnover syndrome results from partial or missing X chromosomes, less than 46.
Your mom has started complaining to you about her varicose veins and is thinking about surgery. What true information could you tell about varicose veins?
Answers
Answer:
One very true and essential information to know about varicose veins is that there is often re-occurrence following after surgery.
Explanation:
Varicose veins are a group of large, benign, twisted, and superficial veins on the skin surface. They may come with no side effect in some sufferer (asides from the physical appearance), and can cause chronic pain and discomfort in others, usually pointing to an underlying circulatory problem. Varicose veins are caused by damaged or weak valves in the veins, and complications like bleeding might occur. Some people with the risk of developing this disease are obese people, people with genetic tendencies, and usually pregnant women. Treatment methods includes compression stocking, a lifestyle change, and some medical procedures like surgery. After surgery, there is usually re-occurrence.
The cells of the cheek become blue when the stain methylene blue is added which property of the cell membrane does this show
Answers
Answer:
So methylene blue when brought to a slide of human cheek cells the nucleus and phone membrane and so forth turns into genuinely visible to facilitate gazing the slide under the compound microscope.
Why do you think we should study air quality and who benefits from the data found?
Answers
poor air quality is.bad for people so we need to study it. everyone benifits in the area
What is the Polymer name for unsaturated fat?
Answers
please help!!!!
¡¡¡¡★✰✯Ill give brainliest✯✰★!!!!
Answers
which one exactly do you need help with?
In soreflies (a hypothetical insect), the dominant allele, L, is responsible for resistance to a common insecticide called Loritol. Another dominant allele, M, is responsible for the ability of soreflies to sing like birds. A true-breeding mute, Loritol-resistant sorefly was mated to a true-breeding singing, Loritolsensitive sorefly, and the singing, Loritol-resistant female progeny were testcrossed with true-breeding wild-type (i.e., mute, Loritol-sensitive) males. Of the 400 total progeny produced, 119 were mute and Loritol-resistant, 114 could sing and were Loritol-sensitive, 81 could sing and were Loritol-resistant, and 86 were mute and Loritol-sensitive. Do you think the (L) and (M) gene loci are linked or unlinked? Justify your answer
Answers
Answer
The (L) and (M) gene loci are linked.
Explanation:
Due to some technical problems, you will find the complete explanation in the attached file named Linked genes.
which is a density dependent factor
A water supplies
B flood
c forest fire
d volcanic eruption
Answers
A density dependent factor is a variable that influences the population size and growth rate of a species based on the population's density or number of individuals per unit area.
Out of the options given, the density dependent factor is A) water supplies. The availability of water can influence the growth rate and population size of organisms living in that area. As the population size increases, the demand for water increases, which can lead to competition for limited resources, decreased reproduction, and increased mortality.
B) Flood, C) forest fire, and D) volcanic eruption are examples of density-independent factors because they affect the population size and growth rate irrespective of the population density. These factors can cause widespread damage, decrease the carrying capacity, and cause population declines regardless of the number of individuals present in the area.
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Is phrenology an example of science or
pseudoscience? Explain your answer.
Answers
Answer:
Pseudoscience
Explanation:
Phrenology is an example of pseudoscience. It is the belief that studying the conformation of the skull reveals the character traits and mental faculties of an individual, a conclusion not at all rooted in fact but nevertheless studied and pursued as such thereby giving a false sense of being based in scientific methods.
Answer:
Pseudoscience
Explanation:
Phrenology is an example of pseudoscience because Gall held beliefs and ignored any information that didn't align with his beliefs. This is a direct example of Gall using pseudoscience and testing his hypothesis with bias through his belief.
Order the steps in the process of fertilization.
Answers
Answer:
The stages of fertilization can be divided into four processes:
1) sperm preparation,
2) sperm-egg recognition and binding,
3) sperm-egg fusion and
4) fusion of sperm and egg pronuclei and activation of the zygote.
5. While bones may provide important clues about the remains, they cannot answer all the questions that a forensic scientist might have about a scene and a deceased person. What other questions might a crime scene investigator have about the remains that cannot be answered by bones alone?
Answers
Answer:
dna finger printing , clothes
A Crime Scene Investigator (CSI) is in charge of extracting every possible piece of evidence from a particular crime scene. More often than not, they are employed by state or federal law enforcement, but civilians with a background in science may also be qualified for this position.
Other questions a crime scene investigator might hve about the remains that cannot be answered by bones alone?Crime scene investigators could also ask other questions and collect evidence such as:
Fingerprints, Footprints, Tire tracks, Blood And other body fluids, hairs, fibers and fire debris. Identification of blood and other body fluids at the scene.Field detection of drugs and explosives.The criminalist must answer the following questions when examining dried blood:
(1) Is it blood?
(2) From what species did the blood originate?
(3) If the blood is human, how closely can it be associated with a particular individual? The determination of blood is best made by means of a preliminary color test.
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PLEASE HELP 10 POINTS! ASAP
Please select the word from the list that best fits the definition
The temperature at which water condenses from a gaseous to a liquid form
A) dew point
B) relative humidity
C) Clouds
D) precipitation
Answers
Answer:
A dew point
Explanation:
is the answer
hopefully this helps :)
Six white-tailed deer and six sika deer were enclosed in a pasture for observation during an eight-year study in central Texas. White-tailed deer are a native species to central Texas, while sika deer are a nonnative species to central Texas. White-tailed deer feed on flowering plants and the tips of trees and shrubs but do not eat grass. Sika deer feed on flowering plants, the tips of trees and shrubs, and grass. All other grazing animals were kept out of the pasture during the study. The number of sika deer more than doubled after the eight years, while the population of white-tailed deer decreased by 50 percent. Which of the following statements best supports the results from the study?
Answers
The sika deer out competed the white-tailed deer in consuming flowering plants and shrubs.
This statement best supports the results from the study.
In an ecosystem, organisms need homes and resources like nutrients to develop, reproduce, and survive. In a habitat, there are scarce resources for which all organisms contend. An ecosystem supports a wide range of species and holds thousands of them.
Competition can be divided into two primary categories: intraspecific and interspecific. While intraspecific competition refers to competition inside a species, interspecific competition is the competition for resources among individuals of different species. Similar species fight for resources and have similar needs.
When two species fight for the same resources, interspecific competition results in one of two outcomes: either the weaker species becomes extinct or occupies a different niche.
Specialists are what?
Animals classified as specialists are those that efficiently utilise their resources and have few rivals as a result.
Except for option (b), none of the other possibilities are true.
White-tailed deer are not specialists since their diets are nearly identical to that of sika deer.
The white-tailed deer population will be impacted if parasites had an impact on the sika deer population.
All animals will be impacted if local climate changes have an impact on plant resources.
Therefore, choice b is the right choice.
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Six white-tailed deer and six sika deer were enclosed in a pasture for observation during an eight-year study in central Texas. White-tailed deer are a native species to central Texas, while sika deer are a nonnative species to central Texas. White-tailed deer feed on flowering plants and the tips of trees and shrubs but do not eat grass. Sika deer feed on flowering plants, the tips of trees and shrubs, and grass. All other grazing animals were kept out of the pasture during the study. The number of sika deer more than doubled after the eight years, while the population of white-tailed deer decreased by 50 percent.
a. The sika deer are generalists, while the white-tailed deer are specialists.
b. The sika deer out competed the white-tailed deer in consuming flowering plants and shrubs.
c. Parasites infected the sika deer population but did not infect the white-tailed deer population.
d. Change in the local climate reduced the availability of food resources for the white-tailed deer population
Helppppppppppppp
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Answers
Answer:
A triangleeeeeeeeeeeeeeeeeeeeeeeee
what does it mean if my bowl movements are neon green and shiny? I have a normal diet so I'm not sure please help!
Answers
Answer:
Green stool often occurs with diarrhea, so drink plenty of fluids and seek immediate medical attention if you or your child becomes dehydrated. So this means that you have diarrhea. Call a doctor, if you have green poop more than a few days.
Explanation: Hope this help and hope you fell better!
If I had two rocks and I wanted to see which one was bigger how would I measure it? (think before you answer)
Question 1 options:
A. length
B. temperature
C.volume
D. mass
Answers
Answer:
C.
Explanation:
Volume makes up the entire object, so the object (rock) with the most volume would be bigger.
Which correctly lists the three types of rock particles that make up soil?
Answers
The three types of rock particles that make up soil are sand, silt, and clay.
Sand particles are the largest, with a diameter of 0.05 to 2 millimeters.
Silt particles are intermediate in size, with a diameter of 0.002 to 0.05 millimeters.
Clay particles are the smallest, with a diameter of less than 0.002 millimeters.
The relative proportions of these three types of particles in soil determine its texture. Soils with a high sand content are coarse-textured, while soils with a high clay content are fine-textured. Soils with a balanced mix of sand, silt, and clay are loam soils, which are considered to be the most fertile.
Soil particles are constantly being weathered and eroded, and new particles are being formed. This process of weathering and erosion is what creates soil. Soil is essential for life on Earth, as it provides plants with the nutrients they need to grow.
Why is it important that psychologists understand biology in their efforts to better understand behavior and mental processes?
Answers
Answer: By looking at the biological bases of human behavior, psychologists are better able to understand how the brain and physiological processes might influence the way people think, act, and feel.
When writing a hypothesis, what type
of statement does it need to be?
A. if and then statement
B. conclusion of what happens
C. reason of liking the science subject
D. data statement
Answers
Answer: A is the answer
Explanation: After you carry out the experiment you will see if your hypothesis was correct.
Hope this helps.
PLEASE HELP ME ON THIS ITS REALLY IMPORTANT THAT I FINISH IT NOW BECAUSE ITS 1:08 AND I HAVE SCHOOL AT 6:00
Answers
Answer:
not sure but you could do these
Explanation:
what was the last thing you ate?
where did you eat?
what was the last place you went? (as in maybe you touched something that had a bacteria)
hope these are helpful :)
How do you prepare a buffer that has a ph of 7. 4 that is needed to maintain our blood cells in culture?.
Answers
Explanation:
To prepare a buffer that has a pH of 7.4 for maintaining blood cells in culture, you can use a combination of two components: a weak acid and its conjugate base. The most commonly used buffer for this purpose is called HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid). Here are the steps to prepare a HEPES buffer with a pH of 7.4:
Calculate the amount of HEPES and its conjugate base needed to make the buffer. The ratio of the acid to its conjugate base should be around 1:10 to ensure that the pH remains stable.
Dissolve the appropriate amounts of HEPES and its conjugate base in distilled water. The total amount of the buffer you prepare will depend on how much you need for your experiment.
Adjust the pH of the solution to 7.4 using a strong acid or base, such as hydrochloric acid (HCl) or sodium hydroxide (NaOH), while monitoring the pH using a pH meter or indicator strips.
Once the pH has been adjusted to 7.4, check the final pH of the buffer to ensure it is still within the desired range.
Sterilize the buffer by passing it through a 0.22 µm filter, if necessary, and store it at 4°C until ready to use.
It is important to note that the exact composition of the buffer may vary depending on the specific culture conditions and experimental setup, and it is recommended to consult the literature or a specialist for specific buffer preparation instructions.