Mucus traps pathogens that are later coughed or sneezed away. What form of body defense applies to this example?
A) first line of defense
B) second line of defense
C) third line of defense
D) antibody-mediated immunity
Answer: A) first line of defense
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Master genes in Arabidopsis thaliana encode products that ________
a. affect expression of many other genes b. are large RNAs which bind to the chromosome that expresses their gene c. all of the choices d. allow the plant to measure daylength
A viral lytic cycle is characterized by:
a. rapid infection and emergence. b. rapid infection, replication of nucleic acids and proteins, assembly of virions and release by rupture. c. a virus remaining in the host cell then being released. d. a viral nucleic acid being inserted into the host genome and possibly residing through multiple cell divisions prior to lytic.
The mutant huntingtin protein that results in Huntington disease
A. causes a decrease in production of another protein. B. leads to degeneration of cells in the brain's striatum. C. is toxic to brain cells. D. leads to degeneration of cells in the brain's striatum and is toxic to brain cells only. E. has all of these traits.
Adult cells cannot be used as the source of nuclei for cloning animals
a. True b. False