Birds are the only modern amniotes with
a. wings.
b. feathers.
c. a four-chambered heart.
d. ectothermic metabolism.
e. more than one of these.
B
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In rabbits, spotted coat (S) is dominant to solid color (s) and black (B) is dominant to brown (b). A true-breeding black spotted rabbit is mated to a true-breeding brown solid rabbit to produce a heterozygous F1 generation. Two F1 individuals are mated, and you do not see a 9:3:3:1 (black spotted: black solid: brown spotted: brown solid) ratio of offspring, but instead see that almost all offspring are a non-recombinant phenotype. This tells you that
A. that the genes for fur pattern (spotted vs. non-spotted) and fur color assort independently. B. that the genes for fur pattern (spotted vs. non-spotted) and fur color are on the same chromosomes. C. that the genes for fur pattern (spotted vs. non-spotted) and fur color are on different chromosomes. D. that the genes for fur pattern (spotted vs. non-spotted) and fur color are epistatic. E. that fur pattern (spotted vs. non-spotted) and fur color are maternally inherited.
Spicy is not a basic taste category identified in humans
1.True 2.False
What do scientists who support the Miller and Urey model of the formation of the first organic molecules on Earth have in common with those scientists who support the hypothesis that organic molecules arrived on early Earth carried in a meteorite?
A) Both support the idea that the first organic molecules on Earth had their origins in outer space. B) Both support the idea that conditions on early Earth led to the formation of organic molecules in the atmosphere. C) Both support the idea that the first organic molecules on Earth were formed from inorganic molecules. D) Both support the idea that only living things can produce organic molecules.
AMP-PNP is a non-hydrolyzable analog of ATP that can bind to proteins in a similar manner as ATP but is no longer hydrolyzed. Predict what would happen to helicase activity if AMP-PNP were added to a DNA replication reaction.
A. Helicase would no longer function, since the AMP-PNP is not hydrolyzed. ATP binding and hydrolysis induce the conformational changes that facilitate DNA unwinding by helicase. B. Helicase would function normally, since AMP-PNP is not the same as ATP and would not bind to helicase. C. Helicase would function faster than normal, since the AMP-PNP is not hydrolyzed. ATP binding induces conformational changes, but hydrolysis slows DNA unwinding by helicase. D. Helicase would function normally, since AMP-PNP is an analog of ATP and would function in the place of ATP.