Which is incorrect about the bases in nucleic acids?
A. Purines always pair with pyrimidines.
B. The large bases are the purines.
C. A = T and G = C.
D. Hydrogen bonds form between base pairs.
E. The purines are thymine and cytosine.
Answer: E
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Bryophytes, like ferns and certain other tracheophyte plants, require
A. air to reproduce sexually. B. water to reproduce sexually. C. soil to reproduce sexually. D. shade to reproduce sexually. E. sunlight to reproduce sexually.
If an animal has an open circulatory system, it will not have
a. a heart. b. respiratory organs. c. oxygen-carrying pigments. d. transport of nutrients. e. capillaries.
How many chromosomes in a normal human cell?
a. 46 b. 11 c. 20 d. 23 e. 46+1
A liger is an offspring produced from a mating between a male lion and a female tiger. Male ligers cannot produce offspring. This is an example of
A. a prezygotic mechanism. B. a prezygotic mechanism and hybrid sterility are correct. C. hybrid sterility. D. hybrid breakdown. E. hybrid inviability.