22. Which of the following helps to stabilize mRNA by inhibiting its degradation?
(A) TATA box
(B) Spliceosomes
(C) 5' cap
(D) poly-A tail
(E) both C and D

36. Which of the following helps stabilize mRNA by inhibiting its degradation?(A)TATA box(B)spliceosomes(C)5ʹ cap and poly ( A ) tail(D)introns

23. If the recombination frequency between gene A and B is 10 out of 100 offspring, gene A and C is 30 out of 100 offspring, and gene B and C is 40 out of 100 offspring. What is the genetic map of these genes on a chromosome? (A) ABC (B) BCA (C) BAC (D) CAB (E) either C or D

24. The inheritance pattern where two or more genes do not assort independently because they are close together on the same chromosome is called (A) epistasis (B) linkage (C) genomic imprinting (D) dominance (E) Mendelian inheritance

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.

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