Growing bacteria that degrade an environmental pollutant, which is also toxic to the cells at artificially high concentrations, might require ________ to obtain a sufficient population for biochemistry studies
A) a continuous batch culture
B) a second growth substrate to keep the culture in exponential growth phase
C) steady state growth kinetics
D) the use of a chemostat
Answer: D
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Which of the following is true of plasmodesmata?
A. They are holes in the cell wall through which the plasma membrane and endoplasmic reticulum of adjacent cells are connected. B. They are channels in the plasma membrane of plant cells made of transmembrane proteins that allow ions and small molecules to pass between adjacent cells. C. They are channels in the plasma membrane of animal cells made of transmembrane proteins that allow ions and small molecules to pass between adjacent cells. D. They provide points of structural support between adjacent plant cells. E. They provide points of structural support between adjacent animal cells.
Which of the following differentiates marshes and swamps from bogs?
a. Marshes and swamps have no moving water. b. Bogs are devoid of plant life. c. Bogs have very little or no moving water. d. Marshes and swamps have more insect life than bogs.
HIV-positive people track their progression of their disease with blood tests that measure the number of
A. blood platelets. B. B cells. C. helper T cells. D. cytotoxic T cells. E. plasma cells.
At an underdominant locus, how will allele frequencies change through time?
a. The homozygote with the greatest fitness advantage will have its allele fixed. b. A balanced polymorphism of both alleles will be maintained at a stable equilibrium. c. The homozygote with the lowest fitness advantage will have its allele lost. d. One or the other allele will be lost depending on their initial frequencies. e. Both alleles will be lost.