Which of the following contributes to the continued development and maintenance of the uterus during pregnancy?
A) inhibin
B) testosterone
C) oxytocin
D) prolactin
E) progesterone
Answer: E
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Place the following events of mitosis in the correct order.
I. Sister chromatids align on the metaphase plate. II. The cleavage furrow forms. III. The nuclear membrane breaks up. IV. Sister chromatids condense. V. Sister chromatids separate. A. I, II, III, IV, V B. III, IV, I, V, II C. IV, III, I, V, II D. III, II, I, IV, V E. IV, I, III, V, II
To test the hydrogen-bond hypothesis for reduced affinity of the heme group for carbon monoxide
when the heme is associated with polypeptide chains, the researchers used which of the following model systems?
a. Mutated rat myoglobin. b. Mutated rat hemoglobin. c. Myglobin gene isolated from a bacteria and introduced into sperm whale. d. Myglobin gene isolated from a sperm whale and introduced into a bacteria. e. Hemoglobin gene isolated from a sperm whale and introduced into a bacteria.
A testcross consists of
a. a cross of two pure-breeding forms to find out which form of a gene is dominant. b. a cross between two unknown forms to determine their genotypes. c. a cross between an offspring and its parent. d. a cross of an F1 hybrid to an individual that is homozygous recessive. e. a cross of two F2 individuals to produce an F3 generation.
The "one-gene/one-enzyme" hypothesis was proposed by
A. Beadle and Tatum. B. Watson and Crick. C. Garrod. D. Franklin. E. Griffith.