Extinct glyptodont and living nine-banded armadillo were related according to Darwin. In what way are they related?
a. They were/are both living.
b. They are both animals.
c. Glyptodont is an ancestor and armadillo is a descendant.
d. Glyptodont is a descendant and armadillo is an ancestor,
Answer: c. Glyptodont is an ancestor and armadillo is a descendant.
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The plant hormone that prevents seed germination even if conditions of temperature and moisture conditions are appropriate would be:
A. auxins B. gibberellins C. ethylene D. abscisic acid E. brassinosteroids
The parts of the brain where addiction arises are
A) the suprachiasmatic nuclei, the ventricles, and the cerebral cortex. B) the nucleus accumbens, the ventral tegmental area, and the prefrontal cortex. C) the frontal medulla, the cerebellum, and the hypothalamus. D) the presynaptic neuron, postsynaptic neuron, and synapse.
In Mendel’s hybridization experiments, the ratio of plants expressing dominant traits in the F2 generation was nearly 3:1, but never exactly the correct ratio. Ignoring any external confounding factors, what effect would you expect a larger sample size to have on the ratio of dominant to recessive traits expressed?
a. Larger sample sizes would have no effect on the ratio. b. The results would drift further from the expected ratio. c. The results would become more precise with more samples. d. Larger sample sizes would increase the risk of cross-contamination.
How do large polar and charged molecules cross biological membranes?
A) Large polar and charged molecules can't cross biological membranes. B) Large polar and charged molecules cross biological membranes via diffusion through the hydrophilic core of the membrane. C) Large polar and charged molecules must be hydrolyzed before they can cross a biological membrane. D) Large polar and charged molecules cross biological membranes via transport proteins that form hydrophilic channels through the membrane. E) Both A and C