Which of the following is(are) true regarding
whale sensory systems?
a. Like fishes, they use lateral line systems for
navigation.
b. Their jaws pick up sound vibrations in the
water and transmit them to their middle
ears.
c. They collect sound waves using external
ears.
d. All whales have auditory canals leading to
their middle ears.
e. All of these are true
B
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Stop codons are also called ________ codons
A) nonsense B) release factor C) degeneracy D) conversion
In his analysis of rII in phage, Benzer assayed complementation
Suppose you try your hand at this with several mutants and get the following results (+ = complementation): 42 and 62 + 42 and 83 – 62 and 63 – 62 and 74 + 42 and 74 – 42 and 75 + 62 and 75 – Mutation 42 has previously been shown to be in a different gene than mutation 62. What can you conclude? A) Mutations 42 and 75 are in the same gene. B) Mutations 62 and 74 are in the same gene. C) Mutations 62, 63, and 74 are in the same gene. D) Mutations 42 and 74 are in the same gene. E) Mutation 63 is not in the same gene as either 62 or 42.
Essential fatty acids are those that are not produced by the body and are necessary in the diet.
a. true b. false
When comparing the sequences of a homologous gene in four different species, one pair of species shows a 1% difference, whereas the other pair shows a 3% difference. Which pair diverged longer ago from their common ancestor and why?
A. The pair with a 1% difference? a smaller difference (1% instead of 3%) indicates that there has been more time to accumulate mutations. B. The pair with a 3% difference? a larger difference (3% instead of 1%) indicates that there has been more time to accumulate mutations. C. The pair with a 3% difference? A larger difference (3% instead of 1%) indicates that there has been less time to accumulate mutations. D. The pair with a 1% difference? a smaller difference (1% instead of 3%) indicates that there has been less time to accumulate mutations.