Which of the following things are made (in part) of carbon? Select all that apply
A. the shells of clams and other mollusks
B. the glucose/sugars in fruits
C. limestone at the bottom of the sea
D. certain gases in the atmosphere
A,B,C,D
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Transition mutations can result from
A. chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base. B. a small insertion or deletion. C. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces and chemical modification of an existing base in the DNA so that in the next round of replication it will pair differently from the unmodified base. D. incorporation of a base analog that exhibits different base-pairing properties from the base it replaces.
Which statement best describes fertilization in the moss life cycle?
a. Pollen is blown by the wind to a female cone, where it forms a pollen tube that grows toward where the egg will form. b. Flagellated sperm swim in a film of water on the surface of the plant to reach an egg. c. Flagellated sperm are blown by the wind to a location near an egg, and then swim through plant fluids to reach the egg. d. Flagellated sperm swim through plant fluids to reach an egg. e. Flagellated sperm attach to the moist skin of certain animals and are transferred to the surface of the plant to
One function of the developing follicle is to ____
a. stimulate ovulation b. secrete progesterone c. secrete estrogens d. secrete gonadotropin-releasing hormone (GnRH) e. secrete glycoproteins, which promote sperm motility
A breeder of cattle has a herd of white cows and a roan bull. Hair color in this breed is controlled by an
incompletely dominant gene. The two homozygous forms are either red or white, and the heterozygous is roan. (a) What color of calves are expected and in what proportions? (b) Outline a procedure to develop an all-red herd. What will be an ideal response?