25. A cell that has 2n + 1 chromosomes is
(A) trisomic
(B) polyploid
(C) aneuploid
(D) monosomic
(E) both A and C

26. Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and allowed to replicate for 1 generation. The DNA is subsequently isolated and centrifuged in a CsC12 gradient to yield what type of gradient band(s)? (A) one heavy band (B) one light band (C) one half-heavy (intermediate to heavy and light) band (D) one heavy and one half-heavy band (E) one heavy and one light band

27. Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and allowed to replicate for 2 generations. The DNA is subsequently isolated and centrifuged in a CsC12 gradient to yield what type of gradient band(s)? (A) one heavy band (B) one light band (C) one half-heavy (intermediate to heavy and light) band (D) one heavy and one half-heavy band (E) one light and one half-heavy band

28. The mechanism of DNA replication is (A) conservative. (B) intermediate. (C) semiconservative. (D) dispersive. (E) complementary.

29. __ enables a single gene to encode two or more polypeptides that are different in their amino acid sequence. (A) Reverse transcription (B) Self-splicing (C) Capping (D) Alternative splicing (E) Regulatory splicing

30. Which one of the following structures belongs to connective tissues? (A) Sweat gland (B) Cardiac muscle (C) Blood (D) Trachea (E) Neuron

31. Which of the following statements regarding the lipid digestion and absorption is not correct? (A) The rate of digestion is increased by the process of emulsification. (B) The digested triglyceride will be resynthesized in the small intestine epithelial cells. (C) Before they are actively absorbed into epithelial cells, the fatty acids and monoglyceride will form micelles along with bile salt and vitamins. (D) The major digestive enzyme is pancreatic lipase. (E) The chylomicrons are too large to diffuse into blood capillaries, but can diffuse into lacteals.

32. There are several mechanisms to maintain the blood glucose concentration during the postabsorptive state. Which one is not correct? (A) Glycogenolysis (B) Gluconeogenesis (C) Glucose sparing (D) Cells use fatty acid as an alternate energy source. (E) The liver will convert glycerol into ketones, which are released into the blood during prolonged fasting.

33. What causes the animal heart to beat so steadily? (A) Heart center of the brain (B) Sinoatrial node (C) Atrioventricular node (D) Purkinje fiber (E) Hypothalamus

34. CO2 is transported from inner tissues to lung mainly by which of the following ways? (A) Dissolved in the plasma (B) Attached to the hemoglobin (C) As carbonic acid (D) As bicarbonate ions (E) As carbon dioxide

35. Which of the following statements regarding the functions of your kidney is not correct? (A) Filtration of blood (B) Water reabsorption (C) Excretion of nitrogenous waste (D) Production of urea as a waste product of protein (E) Regulation of salt balance

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