Select the option that best finishes the following statement: "Evolution is a process __________."
(a) that can be understood based on the principles of mutation and selection.
(b) that results from repeated cycles of adaptation over billions of years.
(c) by which all present-day cells arose from 4–5 different ancestral cells.
(d) that requires hundreds of thousands of years.
(a)
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Which of the following statements regarding vision is NOT true?
A. Vertebrate rods and cones hyperpolarize in response to light. B. Insects and birds can often see into the ultraviolet range. C. Bright light will often produce action potentials in both rods and cones. D. Rhodopsin is found in the membrane of rods.
What is a hypothesis?
a. a report of the findings of scientific experiments b. a specific conclusion of an experiment in an "if . . . then" format c. a way of using isolated facts to reach a general idea that may explain a phenomenon d. the summary of the outcomes of scientific findings e. a testable explanation of a natural phenomenon
Blood is carried away from the glomerulus by
a. an efferent arteriole. b. peritubular capillaries. c. a renal capsule. d. an afferent arteriole. e. proximal tubules.
Helicobacter pylori can grow in the stomach because it
A) hides in macrophages. B) makes a capsule. C) possesses an enzyme that neutralizes HCl. D) makes HCl. E) invades epithelial cells.