The diagram shows a cell in metaphase. What process occurs in the next phase?
a. A cleavage furrow forms, separating the cells.
b. Chromosomes reach their maximum density.
c. Polar microtubules extend, elongating the cell.
d. Nuclear envelopes form around the chromosomes.
c. Polar microtubules extend, elongating the cell.
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In house sparrows (Passer domesticus) it is generally found that both males and females care for the eggs and young
However, some male house sparrows do not provide parental care. In addition, it is known that young that receive parental care from both the male and female are more likely to survive to fledging (leaving the nest). Which of the following activities by males that do not provide parental care would represent the most beneficial trade-off for the reduced survival of their offspring? A) attacking the nests of neighboring males B) mating with additional females and fathering more eggs C) eating to build up energy stores for migration D) grooming to eliminate parasites from their feathers
The term "fluid mosaic model" refers to the:a
solubility of water in the membrane. b. method of substance transport across the membrane. c. movement of surface proteins through the membrane. d. diffusion of lipid-soluble substances through the lipid bilayer. e. movement of lipids and integral proteins within the lipid bilayer.
The concentration of the pesticide DDT is likely lowest in which of the following?
A. a seagull B. a minnow C. a mosquito larvae D. algae E. plankton
If you were making artificial blood plasma, you wouldn't need
A. proteins. B. salts and ions. C. metabolites and wastes. D. hemoglobin.