The gene encoding apolipoprotein B exists in two isoforms, APOB100 and APOB48. These two forms are produced as a result of
A. tissue-specific expression.
B. a gene mutation that results in a stop codon.
C. RNA editing.
D. alternative splicing.
C. RNA editing.
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Bacterial isolates from post surgical infections of several patients on the same hospital floor demonstrate an increase in resistance to similar antibiotics. The pattern of antibiotic resistance in these cases is most likely due to vertical gene transfer among bacteria that carry resistance genes to bacteria that lack those genes.
Answer the following statement true (T) or false (F)
Gastrulation produces
a. hollow balls of cells. b. embryos with primary tissue layers. c. solid balls of cells. d. maternal messages. e. all of these.
Infections, stress or factors that speed up peristalsis may cause
a. diarrhea. b. constipation. c. impaction. d. Crohn's disease. e. Salmonellosis.
Four of the five answers listed below are correctly paired. Select the exception
a. A ? C b. C ? G c. A ? T d. T ? A e. A ? U