Which of the following is a neurotransmitter that triggers a contraction of a voluntary muscle?
A) synapse
B) action potential
C) sodium
D) acetylcholine
D
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Which statement is true?
a. Antibodies are bound to plasma cells. b. Antibody neutralization kills cells that have already been infected. c. Temporary immunity can be transferred between individuals. d. Complement activation occurs within neutrophils.
Recombinant strains of ________ are released to colonize plant roots to produce an insecticide to destroy invading insects.
A. Saccharomyces cerevisiae B. Pseudomonas syringae C. Escherichia coli D. Pseudomonas fluorescens E. Thermus aquaticus
A pregnant woman was told by her doctor that while she is pregnant she might want to let someone else care for her cats so she would not contract toxoplasmosis through which mechanism?
a. Cats may have fleas that transmit toxoplasmosis b. Scratches from infected claws c. Exposure to infected cat feces d. Infection from saliva e. Infection from mice the cat may bring into the house
In comparing the chromosomes of humans, chimpanzees, gorillas, and orangutans, what type of genomic evolution has occurred in chromosome 2 in the human, as compared with the other three species?
A. fusion. B. duplication. C. inversion. D. inversion followed by duplication. E. fragmentation.