What is the most common reason that new mutations are lost from a population?
A) Most mutations are caused by exposure to environmental mutagens that result in many mutations in the same individual, leading to death.
B) Most mutations are silent.
C) All new mutations result in lower reproductive fitness.
D) Populations are of a finite size and new mutations can be lost by chance.
D) Populations are of a finite size and new mutations can be lost by chance.
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Why do chemical reactions tend to speed up when the concentration of the reactants is increased?
A) The reactants move faster. B) The reactants collide more often. C) The reactants have greater energy. D) All of the listed responses are correct.
Plasma membranes and some internal membranes have which of the following proteins, which trigger a change in the cell's activities in response to a stimulus?
A. Receptor proteins B. Transport proteins C. Adhesion proteins D. Transmembrane proteins E. Peripheral proteins
Scientists unearth a Wooly Mammoth from the Siberian Ice Sheath and discover that a eukaryotic "amoeba"-like cell is still alive. Which component of the cell membrane might contribute to maintaining the fluidity of plasma membranes under freezing conditions?
A. high levels of saturated phospholipid tails within the lipid bilayer B. high levels of long phospholipid tails within the lipid bilayer C. absence of cholesterol D. high levels of unsaturated phospholipid tails within the lipid bilayer E. peripheral proteins
Which of the following disinfectants acts by disrupting the plasma membrane?
A) soaps B) aldehydes C) bisphenols D) halogens E) heavy metals