Which of the following occurs first during an action
potential?
a. Many sodium ions flow into the neuron.
b. Voltage-gated sodium channels open.
c. A local disturbance triggers the resting voltage
to reach the threshold level.
d. The interior of the neuron becomes positive.
e. The interior of the neuron becomes negative.
Answer: c
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What structures are found along lymphatic vessels and are heavily clustered in the armpit, groin, and neck?
A. Lymph nodes B. Thymus C. Spleen D. GALT E. Tonsils
Distinguish the functions of DNA and RNA in a eukaryote
What will be an ideal response?
Many plants propagate themselves when new shoots grow from a parent plant or pieces of it. This is known as:
a. self-fertilization b. sexual reproduction c. asexual reproduction d. genetic recombination e. diploid reproduction
The Ames test is used to identify potential carcinogens on the basis of their ability to
A) relocate genes from one section of the genome to another. B) cause back-mutations in bacteria. C) cause replication. D) induce excision repairs