The human immunodeficiency virus mounts a direct attack on TH cells by recognizing the ________ proteins in the plasma membrane of these cells.
A. CD4
B. cytokine receptor
C. CD8
D. major histocompatibility class I
E. Toll-like receptor
Answer: A
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Mechanoreceptors for touch and pressure are located in numerous locations in the vertebrate body
Which of the following is NOT a location of such mechanoreceptors in vertebrates?
a. skin b. skeletal muscles c. internal organs d. walls of blood vessels e. bones
The most common vector-borne bacterial disease in the United States is:
a. Lyme disease b. West Nile virus c. tuberculosis d. cholera e. MRSA
What signals the end of germination?
a. cracking of seed coat b. root breaks out of the seed coat c. emergence of shoot d. shoot rises above ground e. cotyledon falls off
One of the first steps in obtaining a karyotype (such as that shown below of a cancer cell) is treating cells with a drug that stalls cells in mitosis. Why must cells arrest in mitosis for karyotype analysis?
A. Only mitotic chromosome DNA is separated into single strands, allowing for staining by dyes. B. Only in mitosis are homologous chromosomes paired up. C. Only mitotic chromosomes are highly condensed and visible with a light microscope. D. Only mitotic cells contain homologous chromosomes, because mitosis happens after DNA replication.