Which of the following statements is most true regarding X-inactivation?
A) When a cell divides, the inactive X-chromosome remains inactive in the newly formed cell.
B) X-chromosomes that remain active are called Barr bodies.
C) X-inactivation is more common in males than females.
D) X-inactivation results in repressing the expression of approximately 75% of the genes on the X-chromosome.
E) X-inactivation is caused primarily by the expression of several small noncoding RNAs (sncRNA).
Answer: A
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A somatic cell from a corn plant normally contains 20 chromosomes. How many sister chromatids would that cell contain during G2 of the cell cycle?
A. 0 B. 10 C. 20 D. 40 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 know about sister chromatids? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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 one of the following correctly pairs the structure with its major function(s)?
A) hypothalamus–regulates body temperature, blood pressure, and hunger B) cerebellum–regulates memory, learning, and speech C) brainstem–is the input center for sensory data going to the cerebrum D) thalamus–coordinates balance
The light reactions occur in the ________, while the Calvin cycle occurs in the ________
A) stroma; thylakoid membranes B) stroma; nucleus C) cytoplasm; thylakoid membrane D) thylakoid membranes; stroma
Different transport systems for the same nutrient that are part of the same organism are usually regulated in different ways.
Answer the following statement true (T) or false (F)