At one end of a tRNA molecule is a sequence of 3 nucleotides called an anticodon that ____
a. signals the production of a ribosome
b. signals the unwinding of the DNA coils
c. initiates the movement of mRNA out of the cell nucleus and into the cytoplasm
d. binds to its anti-complementary tRNA codon
e. binds to its complementary mRNA codon
e
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Which animals have a gut with two openings, a mouth, and an anus?
a. cnidarians b. annelids c. flatworms d. sponges e. tapeworms
Which of the following is not true of the earliest life on Earth?
1.It arose by chemical evolution. 2.It used RNA as its genetic material. 3.It used organic molecules that were produced naturally. 4.It was dependent on oxygen for metabolism.
Intermediate filaments are typically _______ in diameter.
a. 5-7 nm b. 8-11 nm c. 16-22 nm d. 24-26 nm e. 32-36 nm
Why have legumes been planted as a cover crop to improve the soil fertility of a field?
A) Legumes have nitrogen-fixing bacteria in their root nodules. B) The leaves of legumes absorb more nitrogen than other plants. C) Legumes have carbon-fixing bacteria in their root nodules. D) Legumes aid organic decomposition. E) Legumes need about 100 times less nitrogen than other plants.