RNA is believed to have been the initial genetic system because it can
a. form a stable double helix with a complementary nucleic acid strand.
b. catalyze the polymerization of nucleotides into another RNA strand.
c. form ribosomes.
d. transfer amino acids to ribosomes.
Ans: b. catalyze the polymerization of nucleotides into another RNA strand.
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The following steps refer to various stages in transmission at a chemical synapse
1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. 2. Calcium ions rush into neuron's cytoplasm. 3. An action potential depolarizes the membrane of the presynaptic axon terminal. 4. The ligand-gated ion channels open. 5. The synaptic vesicles release neurotransmitter into the synaptic cleft. Which sequence of events is correct? A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 3 ? 5 ? 4 ? 1 C) 3 ? 2 ? 5 ? 1 ? 4 D) 4 ? 3 ? 1 ? 2 ? 5 E) 5 ? 1 ? 2 ? 4 ? 3
Recent evidence suggests that most microbial communities have many individuals representing at least ________ taxa.
A. 1,000 B. 1,000,000,000 C. 10,000,000 D. 100,000
The "P" in P generation refers to
A. the recessive allele. B. All of the answer choices are correct. C. parental. D. potential offspring. E. pure breeding.
Connective tissue includes adipose tissue, tendons, bone, cartilage, and blood. What do all these tissues have in common?
A. They all consist of few cells sparsely distributed in large amounts of extracellular material. B. They all provide structural support to the body. C. They all physically bind other tissues together. D. They are all hard tissues.