Lipids are the only class of macromolecules that contain:
A. amino acids.
B. nucleotides.
C. fatty acids.
D. phosphate groups.
E. monosaccharides.
C
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You are a doctor are examining a patient whose thymus never developed because of DiGeorge syndrome
You know that this medical condition is usually due to the deletion of a section of chromosome #22 and that a single copy of shortened chromosome causes the syndrome. The patient's parents are both phenotypically normal with normal thymuses. This suggests that _____________. A. both parents are heterozygous B. both parents are homozygous recessive C. the individual inherited the trait from his grandparents. D. the deletion occurred during gamete formation and thus was not part of the parents' genome.
The common goldfish Carassius auratus has 100 chromosomes and is tetraploid. The goldfish therefore has _____ sets of chromosomes containing ______ chromosomes each
A. 4; 25 B. 2; 50 C. 4; 100 D. 1; 100
Acquired immune deficiency syndrome (AIDS) now infects about
a. 20 million people; however, the number is decreasing because of an effective vaccination campaign. b. 20 million people; however, the number is decreasing because of effective antibiotic treatments. c. 33 million people; however, the number is decreasing because of an effective vaccination campaign. d. 33 million people; however, the number is decreasing because of effective antibiotic treatments. e. 33 million people, and continues to spread.
In oxidation-reduction reactions, ____.
A. both molecules give up electrons B. both molecules gain electrons C. cells harvest energy D. the molecule that accepts electrons is reduced E. hydrogen ions are usually absorbed