What do both the rho-dependent and rho-independent mechanisms of termination have in common?
A. Terminate transcription immediately after the stop codon
B. A sequence rich with A-U base pairs
C. Both require a helicase to separate the DNA-RNA complex
D. Formation of a stem-loop structure
D
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The pattern of wet years and dry years shown will probably move the population toward
A. all having larger beaks.
B. all having smaller beaks.
C. having intermediate size beaks.
D. having two, distinct populations.
E. maintaining abundant variation in beak depth.
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 natural selection? What other information is related to the question?
Choose Answer
Given what you now know, what information 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?
Solenoidal supercoiling is best described as:
A. observed when DNA is in solution. B. less compact than plectonemic supercoiling, though more stable. C. observed when eukaryotic DNA is wrapped around basic proteins. D. observed when bacterial or eukaryotic chromosomes are wrapped around basic proteins. E. the tertiary structure of a supercoiled telephone cord.
The reason that some individual hormones have so many different effects is that
a. they influence gene transcription. b. they trigger a second messenger system that produces a cascade effect. c. there are a great many different cells in different tissues that have specific receptors for the hormone. d. the hormone is carried throughout the body and only a small amount is needed to produce its effect. e. they are polar molecules.
Negative staining with India ink can be used to reveal the presence of capsules that surround bacterial cells.
Answer the following statement true (T) or false (F)