The specific white blood cells that HIV attaches to are the ____________ cells.
A. CD4+
B. gp120 -T
C. CCR5-T
D. CXCR4-T
E. CD8-T
A. CD4+
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Insects are currently thought to have evolved from
a. myriapods. b. animals. c. algae. d. crustaceans. e. all of these.
The first genetic material on Earth was probably _____
A) DNA produced by reverse transcriptase from abiotically produced RNA B) DNA molecules whose information was transcribed to RNA and later translated in polypeptides C) self-replicating RNA molecules D) oligopeptides located within protobionts
Oxygen-poor blood becomes oxygen-rich blood in the capillary beds of the
A. alveoli. B. bronchioles. C. larynx. D. bronchi. E. trachea.
Which option incorrectly pairs a class of sensory receptor with one of the stimuli it detects?
A) electromagnetic receptors—light B) chemoreceptors—molecular structure C) mechanoreceptors—sound D) thermoreceptors—touch