What mechanism leads to changes in allele frequencies due to random chance?
A. Genetic drift
B. Natural selection
C. Sexual selection
D. Neutral variation
E. inbreeding
A. Genetic drift
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Bioluminescence is a social behavior of bacterial cells that causes luminescence to occur when a dense cell population has been attained
Indicate whether the statement is true or false.
Which of the following is a characteristic of active transport?
A. Use of ATP or a proton gradient as a source of metabolic energy B. Saturable uptake rate C. Can move materials against a concentration gradient D. All of the choices are correct.
Which tissue system of the plant body is largely responsible for photosynthesis?
a. ground tissue system
b. vascular tissue system c. dermal tissue system d. primary tissue system e. secondary tissue system
The degeneracy of the genetic code refers to the fact that
a. the code has some codons that do not specify an amino acid. b. the code has most amino acids represented by more than one codon. c. the code varies considerably between different organisms. d. the code is commaless, with no indicators of spaces between codons. e. the code varies considerably between different cell types within a multicellular organism.