Glycoprotein spikes protruding from the outer surface of viral envelopes function as
A. toxins.
B. cell lysis factors.
C. factors that bind to host cells.
D. factors needed for site specific recombination.
Answer: C
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Yeast cannot convert grain to alcohol
Indicate whether this statement is TRUE or FALSE.
Which animal phylum lacks a network of nerve cells for gathering information from the environment?
A. Porifera - sponges B. Cnidaria - jellyfish, sea anenomes C. Platyhelminthes -- flatworms D. Nematoda - roundworms E. Mollusca - octopus, squid, clams, snails, and other mollusks
Which of the following statements is false regarding RSV?
A. RSV infects infants aged 6 months and younger; it is unlikely that a 4-year-old would develop a respiratory disease as a result of this virus. B. While RSV is most prevalent in infants 6 months of age and younger, the highest mortality rate is in those children with underlying risk factors such as prematurity. C. Infants aged 6 months and younger are the most susceptible to infection by RSV; however, adults and older children can also become infected with this virus. D. Although RSV is most prevalent in infants aged 6 months and younger, usually by age 2 most children have been exposed to this virus.
Four of the five answers listed below are bound by membranes. Select the exception.
a. mitochondria
b. ribosome
c. peroxisome
d. nucleus
e. lysosome