To remove noncoding sequences in the pre-mRNA of eukaryotes, multiple snRNPs combine with proteins to form a larger complex called the ___________ .
A. 5' cap
B. introsome
C. ribosome
D. spliceosome
E. 3' poly-A tail
D. spliceosome
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Which one of the following nitrogenous bases is not found in an RNA molecule?
A) adenine B) guanine C) thymine D) uracil
In humans, nitric oxide is an important gaseous neurotransmitter. Nitric oxide is synthesized by three isoforms of nitric oxide synthase (NOS). What would be a likely effect if a male were missing the gene that codes for one of the NOS isoforms?
A. He would be unable to produce all the liquid components of semen. B. He would have a low sperm count due to decreased spermatogenesis. C. He would have high levels of mutation within his mature sperm. D. He would have difficulty getting and/or sustaining an erection.
Which of the following enzymes digests starch?
a. carboxypeptidase b. amylase c. trypsin d. chymotrypsin e. pepsin
Which of the following procedures would be used to introduce DNA into a single mouse cell?
A) Southern blotting B) electroporation C) gene gun D) microinjection E) protoplast fusion