Which of the following groups were first to
have an amniotic egg?
a. birds
b. reptiles
c. amphibians
d. bony fishes
e. mammals
B
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What class of neurons in the central nervous system sends commands to muscles?
A. afferent neurons B. efferent neurons C. peripheral neurons D. interneurons
Which of the following processes does notcontribute to the formation of a biologically active form of a protein?
A. posttranslational modification of amino acids B. degradation of mRNA C. removal of one or more amino acid residues D. formation of intrachain or interchain disulfide bonds
If an injection to the mouse contains live S strain Streptococcus pneumonia, ____
a. the mouse will die b. live R strain will be detected in the mouse's blood
c. the mouse will live d. no live S strain will be detected in the mouse's blood e. the live S strain bacteria will lose their pathogenicity
Which of the following is an inherited disorder in which skeletal muscle fibers break down?
a. sclerosis b. dystrophy c. atrophy d. sarcoma e. tetanus