Evolution, viewed on a small scale, as it relates to changes in a single gene or allele frequency in a population over time, is called
A. genetic evolution.
B. macroevolution.
C. phenotypic evolution.
D. speciation.
E. microevolution.
Answer: E
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You are studying regulation of a prokaryotic operon. Experiments show that expression of the operon is increased when levels of biosynthetic product from that pathway are low. Based on this information, what is a likely mode of regulation?
A. The product binds a repressor, allowing it to bind the operator. B. The product binds an activator, helping RNA polymerase to bind the promoter. C. The product binds a repressor, preventing it from binding the operator. D. The product binds to the biosynthetic enzymes, blocking them directly. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about transcriptional regulation in prokaryotes? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
Competition among members of one sex for access to the other sex is called ____ selection
Fill in the blank with the appropriate word.
People who are lactose intolerant can often consume some products made from milk such as cheese and yogurt because microorganisms in their digestive system consume the lactose. By comparison, people with a true milk allergy, which involves an immune response to milk protein, cannot consume milk or products made from milk. Given this information, what can you conclude about milk?
A. Lactose is a carbohydrate, not a protein and is therefore not the cause of true milk allergies. B. The protein that causes a true milk allergy is lactose. C. All people who are lactose intolerant are also allergic to milk. D. Yogurt contains live and active cultures of Lactobacillus acidophilus bacteria and therefore prevents an allergic response in people with a true milk allergy.
A flexible, spiral-shaped bacterium is called a
A) spirochete. B) vibrio. C) coccobacillus. D) spirillum. E) sarcina.