Transformation in bacteria results from the uptake of which molecule?
A) RNA
B) DNA
C) lipid
D) protein
E) polysaccharide
B) DNA
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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?
Which of these ecosystems has the lowest productivity?
A. tropical forest B. temperate forest C. savanna D. open ocean E. lakes
__________ are asymmetrical and do not have
tissues or organs. Fill in the blank(s) with the appropriate word(s).
In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.1. What is the frequency of individuals with AA genotype?
A) 0.20 B) 0.32 C) 0.42 D) 0.81