Changes in heritable traits result from adaptation to environmental influences
Indicate whether the statement is true or false
FALSE
Explanation: Changes in heritable traits result from random mutations.
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Which of the following pairs of career descriptions and work tasks is not correctly matched?
A. Medical microbiologist -- identify the cause of a bladder infection at a hospital lab B. Industrial microbiologist -- manipulate bacterial strains to be less pathogenic C. Public health microbiologist -- track the incidence of AIDS in a population D. Agricultural microbiologist -- identify bacterial causes of crop disease
The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?
A. Animal tissue contains about 10 times as much nitrogen as plant tissue. B. Animals are able to "fix" nitrogen much more effectively than plants. C. Herbivores prefer plants with lower nitrogen content. D. High nitrogen levels are a key part of plant chemical defenses. E. Plant tissue contains about 10 times as much nitrogen as animal tissue.
Unequal distribution of yolk and other components in a mature egg is termed ____
a. cleavage b. gastrulation c. involution d. neurulation e. polarity
How many different kinds of naturally occurring amino acids are specified by the genetic code?
A. 3 B. 6 C. 12 D. 20 E. 28