Which of the following statements is false?
a. Whales use their jaws to hear.
b. Whales lack a pair of middle ears.
c. Killer whales use echolocation and have ears
that are sensitive to high-frequency sounds.
d. Humpback whales emit very low-pitched sounds
that travel long distances underwater.
e. Sound waves are transmitted through a layer of
fat before being transduced in whales.
Answer: b
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The base analog 5-bromouracil can tautomerize. One tautomer behaves like thymine and the other behaves like cytosine. If 5-bromouracil is used as a mutagen, what is the minimum number of times replication must occur to mutate the codon for proline (CCC) into the codon for alanine (GCC)?
A) one generation B) two generations C) three generations D) 5-bromouracil cannot induce this mutation
A simple reflex arc is made up of a sensory receptor and
a. a sensory neuron. b. a motor neuron. c. an effector. d. all of the above.
In a genotype with complete penetrance, less than 100% of individuals with a particular genotype exhibit the expected phenotype
Indicate whether the statement is true or false
The way the pill works is by
A. preventing ovulation, not preventing a birth. B. acting as a barrier to prevent the sperm from reaching the egg. C. causing premature release of the egg. D. creating irritation in the uterus that prevents implantation.