Which of the following is a distinctive component of the cell wall of gram-negative bacteria?
A. Capsule
B. Lipopolysaccharide
C. Peptidoglycan
D. Cytoplasmic membrane
Answer: B. Lipopolysaccharide
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Phenylketonuria in humans is an example of __________
A. incomplete penetrance B. codominance C. an environmentally-influenced trait D. incomplete dominance
The energy required to bring the substrates of a reaction together in the correct way to reach the transition state is called
A. free energy. B. entropy. C. activation energy. D. enthalpy.
What prevents a plant cell from bursting in a hypotonic solution?
a. plasma membrane b. transport proteins which help pump the excess water out of the cell c. cell wall d. a plant cell will not burst in a hypotonic solution because water is moving out of the cell
Which of the following thinkers argued that much of human suffering was the result of human populations increasing faster than food supply, an argument that later influenced Charles Darwin's ideas of natural selection?
A) Charles Lyell B) Thomas Malthus C) Godfrey Hardy D) Gregor Mendel