The most common type of molecule found on the surface of animal viruses for interacting with host cell receptors is a ________.
A. phosphoprotein
B. glycoprotein
C. teichoic acid
D. lipoprotein
Answer: B
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Why don't steroid hormones bind to transmembrane cell-surface receptors?
A. Steroid hormones don't require receptors because they bind directly to the cell's DNA. B. Steroid hormones are not signaling molecules. C. Steroid hormones are nonpolar and therefore cannot bind to receptors. D. Steroid hormones are nonpolar and cross the cell's plasma membrane, binding to receptors inside the cell.
Answer the following statements true (T) or false (F)
1. Sweat has a higher salt concentration than the blood does in humans. 2. Animals that do not control internal water concentration also typically do not control the concentrations of ions like sodium and potassium. 3. An animal that exhibits broad tolerance for changes in the salinity of its environment is said to be "euryhaline." 4. The materials in urine are ONLY those that are filtered from the blood or hemolymph and not reabsorbed by the body following filtration.
At which stage of mitosis are chromosomes photographed in the preparation of a karyotype?
A) prophase B) metaphase C) anaphase D) telophase E) interphase
Which of the following nervous system diseases is treated with both passive and active immunization?
A) arboviral encephalitis B) botulism C) primary amebic meningoencephalopathy D) rabies E) West Nile encephalitis