Which of the following is correct with respect to the amino acid composition of proteins?
A) Larger proteins have a more uniform distribution of amino acids than smaller proteins.
B) Proteins contain at least one each of the 20 different standard amino acids.
C) Proteins with different functions usually differ significantly in their amino acid composition.
D) Proteins with the same molecular weight have the same amino acid composition.
E) The average molecular weight of an amino acid in a protein increases with the size of the protein.
Ans: C) Proteins with different functions usually differ significantly in their amino acid composition.
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Mammals have opposing groups of muscles at a joint; for example, the ________ flexes the forearm and the ________ extends it
a. biceps / triceps b. triceps / deltoid c. deltoid / pectoralis d. pectoralis / triceps
Hominids are characterized by
a. further expansion and elaboration of the brain. b. bipedalism. c. omnivorous feeding behavior. d. further expansion and elaboration of the brain and bipedalism. e. further expansion and elaboration of the brain, bipedalism, and omnivorous feeding behavior.
Which statement describes the greenhouse effect?
A) Most life on Earth relies upon the hospitable temperatures resulting from the greenhouse effect. B) The greenhouse effect is a dangerous phenomenon that should be stopped as soon as possible. C) The greenhouse effect results from the presence of oxygen in the atmosphere. D) Global warming is likely the result of a lessening of the greenhouse effect.
Which statement best describes the difference between therapeutic and reproductive cloning?
A) Therapeutic cloning involves producing medications, whereas reproductive cloning is used for in vitro fertilization procedures. B) Therapeutic cloning is used to produce stem cells that can be coerced into differentiating into a specific cell type, whereas reproductive cloning is used to produce organisms identical to what they were cloned from. C) Therapeutic cloning produces cells that are not genetically identical to their source, whereas reproductive cloning produces cells that are genetically identical to their source. D) There really aren't any differences between therapeutic and reproductive cloning.