In a hypothetical environment, fishes called pike-cichlids are visual predators of large, adult algae-eating fish (in other words, they locate their prey by sight). The population of algae-eaters experiences predatory pressure from pike-cichlids
Which of the following is least likely to result in the algae-eater population in future generations? A) selection for drab coloration of the algae-eaters
B) selection for nocturnal algae-eaters (active only at night)
C) selection for larger female algae-eaters, bearing broods composed of more, and larger, young
D) selection for algae-eaters that become sexually mature at smaller overall body sizes
C
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Which of the following statements about con transport of solutes across a membrane is correct?
a. cotransport proteins allow a single ATP-powered pump to drive the active transport of many different solutes b. in cotransport, both solutes that are being transported are moving down their chemical gradients c. The sodium-potassium pump is an example of a cotransport protein d. cotransport involves the hydrolysis of ATP by the transporting protein e. a cotransport protein is most c
In receptor-mediated endocytosis the proper sequence of event is:
a) primary lysosome exocytoses, digests food outside cell, food units absorbed by channels in plasma membrane. b) ligand-receptor binding, capping, fuse with endosome, secondary lysosome, digestion, absorption. c) capping, ligand-receptor binding, fuse with endosome, secondary lysosome, digestion, absorption. d) ligand-receptor binding, capping, secondary lysosome, digestion, absorption, tertiary lysosome. e) none of the above.
The total number of observed links in the food web divided by the total number of species is the
A) connectance. B) Simpson index. C) linkage density. D) mean chain length.
The body uses atoms in different ways to accomplish different tasks. For example, one portion of the body's calcium supply strengthens bones, whereas another portion combines with proteins to stimulate blood clotting after tissue injury. Which of the
following statements provides the most logical chemical explanation of calcium's ability to perform such different functions? A) The bone contains calcium salts, which are less reactive than the calcium ions found in the blood. B) The calcium in blood is a more reactive form of the atom and therefore has fewer protons than the calcium in bone. C) There are many different isotopes of calcium, and the most reactive isotope is found in the bone. D) The calcium in blood has a lighter atomic mass than the calcium in bone and is in a more reactive form.