In the human eye, what provides the greatest visual acuity (the precise discrimination between adjacent
points in space)?
a. photoreceptors in the sclera
b. photoreceptors in the fovea
c. protein filaments in the lens
d. photoreceptors in the optic nerve
e. photoreceptors throughout the retina
B
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Which is a likely biotic factor limiting songbird distribution in Hawaii to alpine habitats?
A) temperature B) oxygen content C) moisture D) insects causing fatal diseases in songbirds at lower altitudes
When a steroid hormone and a peptide hormone exert similar effects on a population of target cells, then _____
A) the steroid and peptide hormones must use the same biochemical mechanisms B) the steroid and peptide hormones must bind to the same receptor protein C) the steroid hormones affect the synthesis of effector proteins, whereas peptide hormones activate effector proteins already present in the cell D) the steroid hormones affect the activity of certain proteins within the cell, whereas peptide hormones directly affect the processing of mRNA E) the steroid hormones affect only the release of proteins from the target cell, whereas peptide hormones affect only the synthesis of proteins that remain in the target cell
Which process exchanges alleles between homologous chromosomes?
a. mitosis b. genetic recombination c. asexual reproduction d. independent assortment e. anaphase
The __________ is a sedimentary cycle; Earth's crust is the largest reservoir, and there is no major gaseous form.
Fill in the blank(s) with the appropriate word(s).