A coding region of DNA, found between a start signal and a stop signal, is also known as a/an _____.
A) mRNA
B) gene
C) protein
D) ribosome
Answer: B) gene
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See the provided genetic code table. A change in a single base pair could cause which missense mutation?
a. glutamic acid to threonine b. glycine to proline c. threonine to glutamine d. glutamic acid to methionine e. valine to methionine
Sharks have a number of fleshy gill slits instead of a bony gill cover. How does this affect their behavior?
A. Their movements are slow due to low oxygen. B. They live only in highly oxygenated water. C. They keep swimming to move water across their gills. D. They do not maintain neutral buoyancy. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the operculum? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Given the structure of the anti-HIV drug azidothymidine (AZT), how do you think it blocks viral replication?
a. It blocks RNA synthesis b. It inhibits host T cells from replicating c. It inhibits the assembly of new viruses in the cell d. It blocks DNA synthesis e. It prevents HIV from entering the cell
Which one of the following is an example of osmosis?
A. Glucose is transported from our blood stream across cell membranes and into the cytoplasm. B. Sodium is pumped across a cell to increase its concentration on one side of the cell membrane. C. A broken bottle of perfume is able to be smelled throughout the department store. D. Cells of our kidneys reabsorb water to prevent it from all leaving through our urine. E. A bacterium in the blood stream is engulfed by a white blood cell.