Every amino acid contains
A) an amino group and a hydroxyl group.
B) an amino group and an acetyl group.
C) a hydroxyl group and a carboxyl group.
D) a carboxyl group and an amino group.
E) a carboxyl group and a hydroxyl group.
D
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Which of the following statements reflects the second law of thermodynamics?
A. The energy of the starting materials for a reaction will equal the sum of energies of the products plus energy released as heat and disorder. B. The amount of useable energy resulting from a reaction will always be less than the total energy available in the starting materials. C. The entropy of the products of a reaction will always be greater than the entropy of the starting materials. D. The entropy of the starting materials for a reaction will always be greater than the entropy of the products
How did researchers explain the smaller size of sexual maturity for guppies in some Trinidad streams?
a. Some low-quality streams have small carrying capacities, which forces guppies to reach sexual maturity more quickly b. Smaller streams require that individual fish be smaller at sexual maturity. c. Smaller sexually mature guppies were those that had hybridized with killifish, another small fish found in Trinidad. d. When predators select larger fish, the smaller fish reaching sexual maturity will experience increased fitness.
What type of cells keep neurons positioned where they should be, and provide them with metabolic support?
a. other neurons b. loose connective tissue c. neuroglia d. fibroblasts and their collagen secretions e. simple cuboidal epithelium
What type of chromosome structure is commonly found in hyperthermophiles?
What will be an ideal response?