It is hypothesized that viroids evolved from
a) viruses.
b) exons.
c) introns.
d) prions.
Answer: c) introns.
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Many antibiotics kill bacteria because they hinder translation by prokaryotic _____.
A. ribosomes B. capsules C. cytoskeleton D. cytoplasm E. nucleoids 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 translation? 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?
The term N-terminus refers to the presence of a(n) ________ at the 5? end of a polypeptide.
A. oxygen atom B. carboxyl group C. amino group D. carbonyl group E. sulfate group
A specific type of cell is being studied by a scientist. She notices the cell contains a nucleus, lysosomes, a cell membrane and cell wall. What is the correct classification of this cell?
A. A prokaryotic animal cell B. A prokaryotic plant cell C. A eukaryotic animal cell D. A eukaryotic plant cell
Many scientists believe that we are in a global mass extinction caused by human activity. What is conclusive evidence for this assessment?
a. Current estimated extinction rates on islands are 10,000 times greater than background extinc-tion rates. b. Current estimated extinction rates on continents are 10,000 times greater than background ex-tinction rates. c. One genus of tropical butterflies lost 90% of its species during the past 30 years. d. Converting old-growth forest into agricultural fields causes dramatic losses in songbird diver-sity in the converted areas.