Which of the following describes a "knock-out" organism?
A) An organism that is capable of out-competing another organism.
B) An organism that is negative for alleles coding a gene of interest.
C) An organism that is positive for alleles coding a gene of interest.
D) An organism that loses consciousness randomly.
Answer: B
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Which of the following is a likely mechanism for gene dosage compensation?
A. One X chromosome of the female (XX) is inactivated. B. Two X chromosomes of a hermaphradite (XX) are transcribed at one-half the level of the single X chromosome of the male (XO). C. The single X chromosome of the male (XY) is transcribed at twice the level of the X chromosomes of the female (XX). D. All of the choices are correct.
Which of the following statements about the interactions between the hypothalamus and pituitary is false?
a. Most hypothalamic hormones that act on the anterior pituitary are releasers that encourage secretion of hormones by target cells b. The hypothalamus has some neurons whose axons extend into the pituitary's posterior lobe. c. The posterior lobe of the pituitary secretes hormones made in the hypothalamus. d. Antidiuretic hormone (ADH) and oxytocin are synthesized in the cell bodies of neurons in the anterior pituitary.
A malfunction in one of the lysosomal
enzymes responsible for breaking down gangliosides leads to a. cystic fibrosis. b. Huntington’s disease. c. cretinism. d. muscular dystrophy. e. Tay-Sachs disease
Which of the following is unique to archaea?
A) hypotonic B) hypertonic C) isotonic D) fluid mosaic E) passive