The giant squid axon has been used extensively in research to determine the mechanisms by which neurons generate electrical signals. Scientists used microelectrodes to measure the resting membrane potential (inside relative to outside) and discovered a difference of
A. -70 mV.
B. 300 mV.
C. -300 mV.
D. 70 mV.
E. 0 mV.
A. -70 mV.
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Fungi exhibit certain characteristics. One of these characteristics is that they
a. reproduce using seeds and pollen. b. are prokaryotes. c. lack cell nuclei. d. are capable of carrying on photosynthesis. e. reproduce using spores.
A breeder of cattle has a herd of white cows and a roan bull. Hair color in this breed is controlled by an
incompletely dominant gene. The two homozygous forms are either red or white, and the heterozygous is roan. (a) What color of calves are expected and in what proportions? (b) Outline a procedure to develop an all-red herd. What will be an ideal response?
If tyrosine and isoleucine undergo condensation, the new bond that is formed is between the:a
oxygen of the R group and the hydrogen of the amino group. b. carbon of the R group and the nitrogen of the amino group. c. carbon of the carboxyl group and the hydrogen of the R group. d. carbon of the carboxyl group and the hydrogen of the amino group. e. carbon of the carboxyl group and the nitrogen of the amino group.
Suppose that your mother and father are both healthy but carry the allele for cystic fibrosis, which is caused by a recessive allele. What are the odds of you having at least one allele for the disorder?
a. 1 in 4 b. 1 in 2 c. 3 in 4 d. 1