Which of the following protists is the cause of "beaver fever"?
a. Physarum polycephalum
b. Plasmodium falciparum
c. Giardia lamblia
d. Pseudomonas aeruginosa
Ans: c. Giardia lamblia
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Which of the following is NOT an adaptation of mosses for living on land?
A. delayed meiosis B. enclosure of gametes in gametangia C. enclosure of zygotes in the gametophyte D. wind dispersal of gametes E. wind dispersal of spores
In order to cause vasodilation of most muscular smooth muscle,
A. Acetylcholine combines with nicotinic receptors B. Norepinephrine combines with alpha receptors C. Norepinephrine combines with beta 1 receptors D. Acetylcholine combines with muscarinic receptors E. Sympathetic stimulation is removed
The fragments of chromosomes split by restriction
enzymes a. have fused ends. b. have specific sequences of nucleotides and often have sticky ends. c. each have the same number of nucleotides as the original chromosome. d. form a circle. e. have modified DNA nucleotides.
Which of the following sulfur species is highly toxic?
a. hydrogen sulfide b. dimethylsulfide c. elemental sulfur d. calcium sulfate