The Golgi apparatus is not
A. involved with secretion of cellular substances.
B. an organelle.
C. studded with ribosomes.
D. a processing center.
E. a stack of membrane-enclosed sacs.
C. studded with ribosomes.
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A plasmid vector typically has all of the following features except:
A. origin of replication B. selectable marker C. unique restriction sites D. a size range from 4–15 kbp E. par genes
Which repair mechanism identifies daughter strands by methylation?
A. Recombinational repair B. Direct repair C. Base excision repair D. Mismatch repair E. Nucleotide excision repair F. Nonhomologous end joining (NHEJ)
If many human genes differ in about 10% of their bases from another species' same genes and substitutions occur at an estimated rate of 2% per one million years then
A. approximately 5 million years have passed since the two species diverged. B. approximately 3 million years have passed since the two species diverged. C. approximately 10 million years have passed since the two species diverged. D. approximately 20 million years have passed since the two species diverged. E. approximately 200,000 years have passed since the two species diverged.
What is the advantage of play?
A) Play keeps the young close to the parents for longer. B) Play is a chance to practice skills such as hunting, fleeing, and social behaviors. C) Play slows the development of adult behaviors. D) Play decreases competition within the group. E) Play decreases the risk of injury to the young.