What is one reason why the classification of protists is difficult?
a) some protists are unicellular while other protists are multicellular
b) all of the other answer choices
c) protists more closely resemble members of other eukaryotic kingdoms than they do other protists
d) protists may be funguslike, plantlike, or animal-like, but they do not have characteristics of more than one of these groups
Answer: b) all of the other answer choices
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What caused the ‘Dust bowl' region in the United States in the 1930s?
a. deforestation b. acid rain c. overgrazing on grasslands d. plowing of grasslands exposed topsoil to wind e. drought in undisturbed grasslands
A short segment of an mRNA molecule is shown below. The polypeptide it codes for is also shown:
5'-AUGGUGCUGAAG : methionine-valine-leucine-lysine Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5' end) of the messenger RNA now reads A rather than G. What sequence of amino acids will the mRNA now code for? (You do not need a copy of the genetic code to answer the question.) A) methionine-valine-methionine-lysine B) methionine-lysine-leucine-lysine C) methionine-leucine-leucine-lysine D) methionine-methionine-leucine-lysine E) methionine-valine-leucine-lysine
Hyperpolarization of the postsynaptic nerve terminal
A) decreases the chance that an action potential will be initiated. B) increases the chance that an action potential will be initiated. C) has no effect on the initiation of an action potential. D) is stimulated by an influx of calcium ions. E) sensitizes receptors to activation by lower levels of neurotransmitter.
An analysis of a lipid shows that it is made up of two fatty acids and a phosphate group, each bonded to a glycerol molecule. The molecule has a hydrophobic end and a hydrophilic end. Based on this information, what conclusion can you draw regarding this lipid?
What will be an ideal response?