Visual accommodation involves the ability to ____.
A. change the sensitivity of the rods and cones by means of neurotransmitters
B. change the position of the retina
C. change the thickness of the lens by contracting or relaxing certain muscles
D. protect the eyeball from foreign matter
E. prevent eye strain
Answer: C
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One of the reasons that pufferfish are a good species to compare to humans is because
A. it is so easy to hybridize the two and investigate the consequences. B. they are so distantly related that it's easy to distinguish mutually conserved sequences. C. the introns are often identical. D. of the rapid response time in pufferfish to artificial selection. E. they have been separated for so many millions of years and yet the gene sequence is almost identical.
In the image above, the substance indicated as
"B" is a(n) a. inhibitor. b. activator. c. substrate. d. coenzyme. e. cofactor
The outer nuclear membrane is contiguous with
a. the endoplasmic reticulum. b. the nuclear lamina. c. the Golgi apparatus. d. the plasma membrane.
The phylum that shows the greatest diversity, or the greatest number of species, is
A. Echinodermata. B. Chordata. C. Arthropoda. D. Mollusca.