Which extraembryonic membrane produces early blood cells and portions of the digestive tract?
a. yolk sac
b. amnion
c. chorion
d. allantois
e. umbilical cord
ANSWER: a
Biology & Microbiology
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a. biological molecules. b. organ systems. c. tissues. d. cells. e. organisms.
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Temperature ________ the final equilibrium concentration of a diffusing molecule
a. does not alter b. substantially alters c. always alters d. slightly alters
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Drugs that insert on the ________ ribosomal subunit prevent peptide bond formation or inhibit translocation of the subunit during translation.
A. 30S B. 60S C. 40S D. 50S E. 70S
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