Normally, only one sperm fertilizes an egg. What role do other sperm play?
A. They assist the fertilizing sperm in penetrating the egg.
B. They trigger chemical changes in the egg.
C. They dissolve the outer barriers surrounding the oocyte.
D. They assist the fertilizing sperm in penetrating the egg and trigger chemical changes in the
egg.
E. They trigger chemical changes in the egg and dissolve the outer barriers surrounding the
oocyte.
E
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Most Swiss starlings produce four to five eggs in each clutch. Starlings producing fewer or more than this have reduced fitness. Which of the following terms best describes this situation?
A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection
Buchnera aphidicola provides ________ to its aphid host that are essential to the survival of the insect.
A. carbohydrates B. cellulases C. vitamins D. amino acids
Early cell division in an embryo is called
A. cleavage. B. implantation. C. fertilization. D. meiosis.
Joseph went to a copy center and used a copy machine to make a duplicate set of 46 pages. Joseph then stapled every copied sheet to its original. This is similar to how a cell replicates its chromosomes in mitosis. For what reason would a cell do something similar during mitosis?
a) to keep the cell from dividing too early b) to keep the cell from making too many copies of a particular chromosome c) to allow the cell to move onward into Gap 1 phase d) to keep the copies and originals organized for later separation e) to introduce helpful mutations that make mitosis more successful