Which of the following is found in DNA but not in RNA?
A. ribose
B. nucleotides
C. adenine
D. thymine
E. uracil
Answer: D
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A vein is a blood vessel that always carries
a. blood toward the heart. b. blood away from the heart. c. oxygen-rich blood. d. oxygen-poor blood.
Two cells that contain similar steroid receptors may nevertheless respond differently to the steroid if they:
A) contain different DNA strands B) make different steroid receptor cofactors C) have been exocised D) lack lipid nuclei
A phenotypically normal prospective couple seeks genetic counseling because the man knows that he has a translocation of a portion of his chromosome 4 that has been exchanged with a portion of his chromosome 12
Although his translocation is balanced, he and his wife want to know the probability that his sperm will be abnormal. What is your prognosis regarding his sperm? A) 1/4 will carry the two normal chromosomes, 4 and 12, 1/4 will have only the two translocation chromosomes and no normal chromosomes 4 and 12, and 1/2 will have both normal and translocated chromosomes. B) All will carry the same translocation as the father. C) None will carry the translocation. D) 1/2 will be normal and the rest will have the father's translocation.
Among the fungi, which feature is uniquely present in the chytrids?
A. Polysaccharide capsule B. Pellicle C. Cell wall composed of mannans D. Flagella