What is NOT a viable explanation for the lack of fossil records for more species?
a. Movement of Earth’s crust have destroyed fossils.
b. Many species have not been preserved.
c. Population density is too small to produce fossils that survive.
d. Certain environments do not produce fossils as well as others.
e. Body sizes are too large to become fossilized.
ANSWER: e
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In the absence of evidence from fossils, systematists frequently use a technique called ____ to identify ancestral and
derived character states.
a. outgroup comparison b. ingroup analysis c. gel electrophoresis d. microarray analysis e. homology comparison
Respond to the following statements with reference to the five vitamins listed below.
A. This vitamin functions in carbohydrate metabolism. B. A deficiency of this vitamin causes Beri beri. C. D. This vitamin is a component of the coenzyme NAD. E. This vitamin is a coenzyme involved in protein metabolism and immune function. F. A deficiency of this vitamin causes anemia and neurological disorders and is a coenzyme important in amino acid synthesis.
Septic shock is typically associated with
A) superantigens. B) exotoxins. C) exotoxins or endotoxin. D) either Gram-negative or Gram-positive infections. E) Gram-negative infections.
One potential consequence of protein denaturation is that the:
A) protein becomes more tightly folded. B) protein adds another polypeptide to its folded shape. C) protein loses its functionality. D) protein performs more efficiently than it did before. E) protein's primary structure changes.