A remora feeds on the scraps that escape from a shark's mouth while feeding. It has no clear positive or negative impact on the shark. This is an example of
A) competition.
B) commensalism.
C) amensalism.
D) neutral.
B
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Peroxisomes are examples of:
A. microbodies. B. ribosomes. C. chromosomes. D. nucleosomes. E. lysosomes.
If a germ-line cell from an owl contains 8 picograms of DNA during G1 of interphase, how many picograms of DNA would be present in each cell during prophase I of meiosis? (Enter the number only, not the units.)
What will be an ideal response? 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 meiosis? 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?
RNA splicing provides an opportunity for regulating gene expression because:
A. the same exons may be spliced together in different sequences to produce different proteins from the same primary transcript. B. the same introns may be spliced together in different sequences to produce different proteins from the same primary transcript. C. a spliceosome in one cell can "see" as an intron what another spliceosome in another cell "sees" as an exon, allowing different proteins to be produced from the same primary transcript. D. methylation of spliceosomes controls how rapidly primary transcripts are processed and sent to the cytoplasm. E. methylation of the polyA tail controls how rapidly the primary transcript can be broken up and spliced back together again.
By some estimates, how many species are undergoing premature extinction because of human actions?
a. 6 per day
b. 10 per day c. 1 per hour d. 6 per hour e. 10 per hour