The gene encoding apolipoprotein B exists in two isoforms, APOB100 and APOB48. These two forms are produced as a result of
A. alternative splicing.
B. tissue-specific expression.
C. a gene mutation that results in a stop codon.
D. RNA editing.
Answer: D
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a. descent with modification b. genetic mutations c. genetic variation d. differences in allele frequencies e. differences in genotype frequencies
This arthropod is a filter feeder, a
hermaphrodite, and the only arthropod that secretes an external shell. This arthropod is ___.
a. an isopod b. a barnacle c. a centipede d. a krill e. more than one of these
Tissue whose cells are striated and fused at the ends
by adhering junctions so that the cells contract as a unit is __________ muscle. a. smooth b. skeletal c. visceral d. cardiac e. none of these
Which of the following techniques involves using tiny DNA-covered spheres of gold or other metals to deliver transgenes into plant or animal cells?
A) Retrovirus-mediated transfer B) Pronuclear microinjection C) Electroporation D) Gene gun E) Calcium chloride transformation