In a resting neuron, which ion is leaking out of the cell?

a. potassium only
b. sodium only
c. chloride only
d. calcium only
e. both sodium and potassium


ANSWER: a

Biology & Microbiology

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A triploid plant is usually ____ because chromosomes cannot segregate properly during ____

a. not viable; mitosis b. sterile; meiosis c. sterile; mitosis d. not viable; meiosis e. not viable; spore formation

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Which of the following is mismatched?

a. cytokinin; retards aging b. auxin; promotes cell elongation c. gibberellin; involved in phototropism and gravitropism d. abscisic acid; promotes stomatal closure e. ethylene; promotes leaf abscission

Biology & Microbiology

The tongue length of an animal is controlled by two alternative alleles at a single locus, L (long) and l (short). If an individual has parents that are both homozygous dominant, it will be

A) homozygous dominant with a long tongue. B) heterozygous with a long tongue. C) heterozygous with a short tongue. D) homozygous recessive with a long tongue.

Biology & Microbiology

Genetics studies of human populations have revealed that

A) it is nearly impossible to determine the relatedness of human populations. B) Homo sapiens probably did not evolve from primates. C) humans have very little genetic variation compared to other mammals. D) all humans are virtually identical. E) human populations vary tremendously at the level of DNA sequences.

Biology & Microbiology