In the TCA cycle, two carbons are removed from citric acid in the form of ________, thereby regenerating oxaloacetate to complete the cycle.
A. ethanol
B. methanol
C. carbon dioxide
D. acetyl-CoA
Answer: C
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DNA and RNA contain functional units known as:
A. peptides. B. enzymes. C. amino acids. D. nucleotides. E. fatty acids.
In which structure do cilia covered in mucus trap foreign particles?
a. urinary tract b. reproductive tract c. arteries d. respiratory tract e. digestive tract
A(n) __________ is an organ that allows exchange of nutrients between an embryo and its mother.
Fill in the blank(s) with the appropriate word(s).
Cows can derive nutrients from cellulose because
A) they produce the enzymes that break down cellulose. B) they chew their food so thoroughly that cellulose fibers are broken down. C) their intestinal tract contains cellulose-hydrolyzing microorganisms. D) they convert cellulose into starch, which is easily broken down in the intestinal tract.