In your classroom aquarium you notice that the fish tend to stay around the rock piles and plants instead of swimming around the open water. Which statement below best explains your observations?
A) The fish are seeking shelter from strong currents.
B) Fish use structures in their environment for protection and cover.
C) Fish store uneaten food around structures.
D) Structures capture heat so the fish use these locations to warm their bodies.
Ans: D) Structures capture heat so the fish use these locations to warm their bodies.
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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.
Which part of the central nervous system is located within the vertebral canal?
A. brain B. spinal cord C. ganglion D. cerebellum
How many genes does a human X chromosome carry?
a. 100 b. 1,400 c. 2,800 d. 14,000 e. 28,000
The carotenoid pigments of some phototrophs interact with ________ to reduce its toxicity.
A. singlet oxygen (1O2) B. hydroxyl radical (HO-) C. peroxide anion (O22-) D. superoxide radical (O2-) E. molecular oxygen (O2)