Which of the following is NOT one of the four
major intervals in the geologic time scale?
a. Mesozoic
b. Proterozoic
c. Carboniferozoic
d. Cenozoic
e. Paleozoic
C
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What are the ecological consequences of acidification of rain and oceans?
A. They improve the health of ecosystems. B. Acid rain damages ecosystems, but ocean acidification improves the health of oceans. C. They damage the health of ecosystems. D. They do not have any consequences on ecosystems.
This cellular structure lacks a membrane:
A. microbody B. nucleus C. nucleoid D. endoplasmic reticulum E. Golgi body
Garrod first proposed that:a
metabolic defects were due to the lack of an enzyme. b. metabolic defects were due to excess enzyme production. c. metabolic defects were due to chromosomal changes. d. mutations were heritable. e. metabolic defects did not occur in humans.
Which of the following events occurs directly after a DNA molecule is unzipped?
A.) Mismatched nucleotide bases are identified and replaced. B.) Free-floating nucleotides pair up with exposed bases. C.) Identical double-stranded DNA molecules are formed. D.) Enzymes break hydrogen bonds between base pairs.