In RNA molecules, adenine is complementary to
A.) cytosine.
B.) guanine.
C.) thymine.
D.) uracil.
Ans: D.) uracil.
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If damaged DNA is detected and cannot be repaired, which protein can trigger apoptosis?
a. retinoblastoma proteins (Rb) b. cyclin-dependent kinase (Cdk) c. p53 d. p21
Which of the following elements is not particularly abundant in living cells?
a. carbon b. hydrogen c. helium d. nitrogen e. oxygen
Which of the following statements is NOT true?
a. All chordates have a notochord. b. All chordates have pharyngeal pouches or gill slits. c. All chordates have a dorsal nerve cord. d. All chordates are vertebrates. e. Chordates are deuterostomes.
Scanning tunneling electron microscopes create a three-dimensional image of specimens at atomic level resolution.
Answer the following statement true (T) or false (F)