Which of the following statements about stratified temperate zone lakes is NOT true?
A. Temperature gradients change from summer to winter.
B. Solar radiation warms the surface layers in summer.
C. Rich nutrients from the continual production of detritus accumulate near the surface of the lake.
D. Populations of plankton and zooplankton depend on both sunlight and nutrient levels.
E. Wind aids in the circulation of water.
Answer: C
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Which of the following statements about DNA is (are) true?
A) DNA contains thymine but not uracil. B) DNA molecules contain deoxyribose. C) In a double-stranded DNA molecule, adenine on one strand will be connected to thymine on the complementary strand by two hydrogen bonds. D) All of the above statements are true.
Lysosomal enzymes function best at a pH of about ____
a. 7 b. 6.5 c. 3 d. 5 e. 8.5
Which of the following is true in the moss life cycle?
a. Gametophytes originate within and are dependent upon sporophytes. b. Sporophytes originate within and are dependent upon gametophytes. c. Both gametophytes and sporophytes are totally independent from each other and are equally dominant. d. Gametophytes are free-living and photosynthetic, but are replaced by a dominant sporophyte generation. e. Gametophytes are photosynthetic and partially independent from the sporophytes.
All gametes contain
a. two chromosomes. b. two identical sets of chromosomes. c. two different sets of chromosomes. d. one chromosome. e. one set of chromosomes.