Most scientists theorize that prokaryotic cells evolved before eukaryotic cells based on
which observation?
Eukaryotic cells are smaller.
O Prokaryotic cells are the only ones with cell walls.
Prokaryotic cells are less complex,
Eukaryotic cells have ribosomes.

Answer:

The answer is simple.

Explanation:

B, because this is the only apparent answer. It is being transported from something. I'm sure there's some scientific information to back this up.

The reason I said that is because I'm only in 7th grade, and I'm not yet learning about that in science. But you can't blame me for trying. I'm glad to help out if this is correct, but I'm sorry if this is no help.

The very first and last step to every microbiology lab exercise is washing hands and disinfecting the work area, ensuring safety and preventing contamination.

In a microbiology lab, maintaining a sterile environment is crucial to avoid cross-contamination and ensure accurate results. The first step is to wash your hands thoroughly with soap and water, followed by disinfecting the work area with a suitable disinfectant (e.g., 70% alcohol). This helps to remove any potential contaminants from your hands and workspace. Throughout the lab exercise, proper aseptic techniques must be followed.

Finally, after completing the exercise, wash your hands again and disinfect the work area to ensure that no microorganisms or contaminants remain, ensuring safety for you and others in the lab.

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The right answer is D . A question about what individuals or peoples should do cannot be answered by science.

Science is a system that uses information derived through observation, experimentation, and other techniques to attempt to comprehend natural occurrences. Because of this, it has been able to learn about practically all elements of the world and find answers to all kinds of questions, including challenging or complex ones, through research and the scientific method. Science, however, cannot provide answers to concerns about characteristics that cannot be observed, tested, or that depend on perception because it is based on experimentation and observation.

So, it cannot instruct individuals what to do or how to act, even though it is acceptable and contains all the known facts.

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The DNA polymerization takes place continuously on the template strand.

DNA polymerization is the process of synthesizing a new DNA strand from a pre-existing template. This process, as well as other processes such as DNA replication and protein synthesis, are examples of biological polymerization.Let's learn about the strand names in the DNA molecule.There are two strands in DNA, one of which is called the leading strand, and the other is called the lagging strand.

When DNA is replicated, one strand of the parent molecule serves as the template for the complementary strand that is synthesized. The parent strand that runs in the direction from 3’ to 5’ is referred to as the template strand, while the newly synthesized complementary strand that runs in the opposite direction from 5’ to 3’ is referred to as the leading strand.Therefore, DNA polymerization takes place continuously on the leading strand.

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Secondary lymph organs include Peyer patches (B), the appendix (C), adenoids (E), and the spleen (F).

Secondary lymph organs are organs that are involved in the immune system but are not the primary site of immune cell development. These organs include the spleen, tonsils, lymph nodes, and Peyer's patches in the small intestine.

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The current optogenetic method is effective at restoring the vision of the clock and the wavefront model describes a clock mechanism that is vital for somite development. The clock is provided by oscillating Notch and Wnt signals in one model report.

The wave is a nose-to-tail gradient of the FGF protein from rostral to caudal. Despite the fact that somites are transient designs, they are critical in coordinating the segmental example of vertebrate undeveloped organisms.

Blocks of mesoderm known as somites can be found on either side of the neural tube in the embryo of a vertebrate.

The unsegmented paraxial or presomitic mesoderm (PSM) gradually divides into bilaterally symmetrical epithelial somites from the anterior to the posterior direction during somitogenesis.

The neural arches come from one somite's caudal half, while the vertebral body is made up of parts of two somites that are next to each other. The normal development of the vertebral bodies and intervening discs depends on interactions between the notochord and the axial mesenchyme.

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Explanation:

Structures that have lost their use through evolution are called vestigial structures. They provide evidence for evolution because they suggest that an organism changed from using the structure to not using the structure, or using it for a different purpose..

Hope it will help :)

Answer:

1. Nutrients released into the water (from fertilizer run-off, for example)

2. Rapid growth of algae and phytoplankton

3. Rate of decomposer respiration increases as additional dead algae sink to lake bottom

4. O2 in water becomes depleted

5. Fish die of suffocation

The translocation of the dorsal protein to the ventral nucleus in Drosophila is crucial for the establishment of dorsal-ventral patterning during embryonic development.

In Drosophila embryogenesis, the dorsal-ventral axis is established through the localization and activity of the dorsal protein. The dorsal protein is initially uniformly distributed in the cytoplasm of the embryo. However, upon activation of the Toll signaling pathway, which is triggered by the interaction between the Toll receptor and ligand, the dorsal protein undergoes translocation to the ventral nucleus.

The translocation of the dorsal protein to the ventral nucleus is facilitated by the proteolytic degradation of its cytoplasmic inhibitor, known as Cactus. Upon Toll pathway activation, Cactus is phosphorylated and targeted for degradation by the proteasome. This leads to the release of the dorsal protein, allowing it to translocate to the nucleus.

Once in the ventral nucleus, the dorsal protein acts as a transcription factor, regulating the expression of various target genes involved in dorsal-ventral patterning. Its presence in the ventral nucleus is essential for the correct specification of cell fates along the dorsal-ventral axis of the developing embryo.

Overall, the translocation of the dorsal protein to the ventral nucleus is a critical step in the signaling cascade that establishes the dorsal-ventral axis during Drosophila embryogenesis.

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Answer:

a

Explanation:

a

Answer:

C

Explanation:

When rust forms on something, a chemical change is occurring.

Answer:

Compounds => carbon dioxide, water

Element => Carbon (C), Oxygen (H), and Hydrogen (H)

Chemical formula: \( CO_2 \), \( H_2O \)

Explanation:

Compound is the combination of two or more atoms of different elements.

The compounds in the models are: carbon dioxide and water

The Elements in the models combine to form the compounds:

They are:

Carbon (C), Oxygen (H), and Hydrogen (H).

Chemical formula that shows the proportion in which the atoms of each element are combined to form the compounds in the models are:

\( CO_2 \) for carbon dioxide, and

\( H_2O \) for water.

Answer:

acetyl CoA

Explanation:

Pyruvate and fatty acids enter the mitochondrion (bottom) and are broken down to acetyl CoA.

Answer: the canine parvovirus infection is digestive

giardiasis is also digestive

tracheobronchitis is respitory

feline viral rhinotracheitis respitory

coccidios im pretty sure that is digestive

Explanation:

Answer:

Explanation:

The role of rainforests in the water cycle is to add water to the atmosphere through the process of transpiration (in which plants release water from their leaves during photosynthesis). This moisture contributes to the formation of rain clouds, which release the water back onto the rainforest.

Ebola viruses make many copies of themselves by combining host and virally encoded enzymes with host cell architecture rather than by any type of cell division.

The virus completes a set of steps when infecting each individual cell.

The following are the steps during the replication of Ebola Viruses:

The several steps in the life cycle of the Ebola virus, such as host cell attachment and entrance utilizing glycoproteins, absorption by endocytosis, replication of the RNA genome by the viral polymerase enzyme, transcription and translation of the Ebola genes, and finally viral release.

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Suppose that a mutant form of GAL80 protein lacks the domain that binds to GAL4 protein. Yeast cells with this mutant GAL80 will always activate the genes needed for galactose metabolism even in the absence of galactose. The correct option is c.

The GAL80 protein in yeast is a negative regulator of gene expression involved in galactose metabolism. It functions by binding to the GAL4 protein, which is a transcriptional activator that promotes the expression of genes involved in galactose metabolism.

The binding of GAL80 to GAL4 inhibits GAL4's activity, thereby preventing the activation of these genes.

If a mutant form of GAL80 lacks the domain that binds to GAL4 protein, it means that the mutant GAL80 cannot interact with GAL4 and inhibit its activity. In this scenario, the yeast cells with the mutant GAL80 will be unable to repress the genes needed for galactose metabolism, even in the absence of galactose.

Therefore, the correct answer is option c. The yeast cells with the mutant GAL80 will always activate the genes needed for galactose metabolism, even in the absence of galactose.

This is because the lack of interaction between GAL80 and GAL4 prevents the repression of gene expression, leading to constitutive activation of the galactose metabolism genes.

It's important to note that the presence of galactose can still further enhance the activation of these genes, as GAL4 can function synergistically with galactose to increase gene expression. However, even in the absence of galactose, the mutant GAL80 will result in the continuous activation of the genes needed for galactose metabolism.

The correct answer is c. always activate the genes needed for galactose metabolism even in the absence of galactose.

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Answer:The elements in the compound are represented by their chemical symbols in a chemical formula and ratios of different elements are represented as subscripts on each chemical symbol.

Explanation:

Autotrophs such as plants or algae use carbon dioxide from the air to make organic compounds such as glucose.

This process is called photosynthesis, which is the conversion of light energy from the sun into chemical energy stored in organic compounds. During photosynthesis, plants and algae use the energy from sunlight to convert carbon dioxide and water into glucose and oxygen. The process involves the absorption of light energy by pigments called chlorophyll, which is found in the chloroplasts of plant cells. Carbon dioxide diffuses into the leaf through small pores called stomata, and then it is used by the plant to make glucose through a series of chemical reactions. The oxygen produced during photosynthesis is released into the atmosphere as a byproduct.

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Factors that enhance an organism's ability to adhere to host tissues include adherence enzymes and fimbriae. The correct option is b and c.

Adherence enzymes help the organism to break down the host's tissues, allowing it to gain access and colonize the area. Fimbriae are hair-like structures on the surface of the organism, which assist in attaching to the host's tissues. These factors play a critical role in the success of the organism's infection and its ability to survive within the host.

Peptidoglycan and lipopolysaccharide, on the other hand, are components of the bacterial cell wall and outer membrane, respectively, but they do not directly contribute to adherence to host tissues. The correct option is b and c.

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Answer:

C: Both

Explanation:

Both plant and animal cells uses energy through cellular respiration.

Both animal and plant cells use energy to carry out their life processes. Details about use of energy can be found below.

Chemical energy in form of adenosine triphosphate (ATP) is used by every living organism to perform certain tasks.

This chemical energy is obtained by the process of cellular respiration, which is the process whereby food molecules are broken down to synthesize energy.

Therefore, both animal and plant cells as living cells use energy to carry out their life processes.

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Answer:

Typically, scientists communicate their work within the scientific community by writing and publishing research articles and presenting posters and oral communication of scientific conferences.

Answer:

Scientists often communicate their research results in three general ways. One is to publish their results in peer-reviewed journals that can be ready by other scientists. Two is to present their results at national and international conferences where other scientists can listen to presentations.

Answer:

I don't know

Explanation:

I don't know

Answer:

The answer is Scientific thoeries are a culmination of many scientific investigations drawing together all current evidence.

Explanation:

Answer:

A few of the positive particles aimed at a gold foil seemed to bounce back.

Explanation:

Some of the positive particles aimed at a gold foil seemed to bounce back which gives information to the scientists that some heavy particles present in the center of the atom which bounce back the positive particles. so from this evidence the scientists says that atom is divisible and having subatomic particles such as proton, electron and neutron. Proton and neutron is present in the center whereas electron is revolving around the nucleus of an atom.

Answer:

I don't have an exact answer.

Explanation:

Anyone who bothers to use the answer above me, DON'T! It's an inncorrect answer. I lost my 100% in my class for that answer alone so it is either                    (A.                                                                                                                                      (C.                                                                                                                                    (D.

Techniques that would not be suitable for determining the presence of a specific mRNA in a tissue sample are : RNA interference, RNA-seq, or microarray.

The most sensitive technique for detecting and quantifying mRNA is RT- PCR. Using RT-PCR, even small sample sizes can be used in the quantification of mRNA and the technique can do this using just a single cell.

A number of widely used procedures exist for detecting and determining the abundance of a particular mRNA in RNA sample. But four popular methods are: Northern blot analysis, nuclease protection assays (NPA), in situ hybridization and reverse transcription-polymerase chain reaction (RT-PCR).

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Floods and flash flooding Now is the time to determine your area's flood risk. ... Flash floods have a rapid hydrological response in catchments with short lag times, ... Two different types of flood hazard assessment methods were tested: (i) a ... elongation ratio and roughness index can be used to explain the flash flood types.

Answer:

Flooding is an overflowing of water onto land that is normally dry. Floods can happen during heavy rains, when ocean waves come on shore, when snow melts quickly, or when dams or levees break. Damaging flooding may happen with only a few inches of water, or it may cover a house to the rooftop. A flash flood is = A flood caused by heavy or excessive rainfall in a short period of time, generally less than 6 hours. Flash floods are usually characterized by raging torrents after heavy rains that rip through river beds, urban streets, or mountain canyons sweeping everything before them.

Explanation:

i new the first on the top of my head but the second on was on google mabye  this would help.

Increasing carbon dioxide in the atmosphere threatens marine life by a. acidifying the ocean.

Increasing carbon dioxide in the atmosphere threatens marine life by acidifying the ocean. This phenomenon, known as ocean acidification, occurs when excess carbon dioxide dissolves in seawater, leading to a decrease in pH levels.

As the ocean becomes more acidic, it poses a significant threat to various forms of marine life, including shell-forming organisms like coral reefs, oysters, and other shellfish. The acidic conditions make it difficult for these organisms to build and maintain their calcium carbonate structures, essential for their survival and growth.

Additionally, acidification can also impact the food chain by affecting the development and survival of small planktonic organisms that serve as a crucial food source for many marine species.

As a result, the overall ecosystem balance and biodiversity of marine environments are at risk.

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Answer:

it needs somewhere comforatible

Explanation:

When they circle around they need to get that space soft and then they will lay down

Answer:

Dioxins.

Explanation:

Dioxin is a type of water pollution caused by leaded gas, the production of some pesticides, and burning garbage.

Water pollution may be defined as any undesirable or contaminated substance presents in water bodies that definitely harms the life of aquatic organisms.

Dioxins are highly toxic to the environment as they are responsible for causing cancer, a threat to the immune system, etc.

They are persistent organic pollutants that take a long time in the degradation process which involves breakdown into simpler substances.

Therefore, Dioxin is a type of water pollution caused by leaded gas, the production of some pesticides, and burning garbage.

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