A differentiated cell ____
a. has only the genes required for that cell type
b. is found in the zygote
c. is not found after gastrulation
d. has all the genes that came from fertilization
e. has 23 chromosomes
ANSWER: d
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The function of the secretory component of the IgA molecule is
A. to protect IgA from being destroyed by proteolytic enzymes. B. to coat the antigen. C. opsonization. D. to fix IgA to the antigen.
A mosquito becomes infected with West Nile virus and then it bites a human and transfers West Nile virus into the human's bloodstream. Which organism(s) is the vector in this case?
a. human b. mosquito c. bird d. mosquito and bird e. mosquito and human
In knockout experiments,
a. genes are added to chromosomes. b. normal genes are replaced physically by mutated genes. c. genes are mutated or deleted to prevent their expression. d. mRNAs are prevented from attaching to ribosomes. e. the protein products of specific genes are inactivated.
The science of comparative genomics to study human gene function is possible because much of the human genome is
conserved among other closely related species. Indicate whether the statement is true or false.