An unscrupulous dog breeder has been selecting for dogs that have very large litters, with the goal of maximizing profits. Why might this strategy be counterproductive?
A. Intrauterine cannibalism will reduce the number of puppies.
B. It will cost too much money to feed all those puppies.
C. The puppies from large litters are likely to be malnourished, and the mother will have few resources to devote to future litters.
D. Litter size is not influenced by genetics.
Answer: C
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The study of antigen-antibody reactions is known as
A) serology. B) immunology. C) toxicology. D) epidemiology.
Which two antibiotics affect nucleic acids of bacteria?
A. Penicillin and vancomycin B. Tetracycline and amphotericin B C. Trimethoprim and sulfonamides D. Rifampin and quinolones E. Tetracycline and bacitracin
Goblet cells are critical to the movement of food in the body because they
A) secrete mucus in the digestive tract. B) produce basement membrane for epithelial tissues. C) synthesize cholesterol. D) form gap junctions. E) produce sodium-potassium pumps.
What molecule is responsible for translation of the four-letter "nucleic acid language" (A, T, G, and C nucleotides) into the 20 "amino acid language" of proteins by bringing in amino acids to the ribosome?
A) Messenger RNA B) Ribosomal RNA C) Transfer RNA D) DNA