Chromosomes decondense into chromatin at which point in the cell cycle?
a. at the beginning of S phase
b. at the end of interphase
c. at the beginning of prophase
d. at the beginning of metaphase
e. at the end of telophase
ANSWER: e
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Microorganisms do not generally reproduce sexually; therefore, species are usually defined by phenotypic and genotypic similarities.
Answer the following statement true (T) or false (F)
Sodium concentrations are higher outside and glucose concentrations are higher inside the cell. Using the same membrane protein for Na+ and glucose transport, what is it called when a Na+ electrochemical gradient is used to drive glucose transport into the cell against its concentration gradient?
A. primary active transport B. secondary active transport C. primary facilitated diffusion D. secondary facilitated diffusion E. passive diffusion
If allele W has a frequency of 0.6, and allele w has a frequency of 0.4, what is the predicted frequency of heterozygous offspring?
a. 0.36 b. 0.24 c. 0.48 d. 0.16
Which of the following is NOT true about enzymes?
a) They lower the activation energy of chemical reactions. b) They are consumed by the reactions they catalyze. c) Each one is specific to the particular substrate(s) to which it binds. d) They are usually made of amino acids.