The seminal vesicles (“sperm vessels”) are
misnamed. Sperm are actually stored in the
a. vas deferens.
b. epididymis.
c. prostate.
d. scrotum.
e. urethra.
Answer: b
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In E. coli, the adenine in the sequence GATC is methylated by the Dam enzyme. In the same cells a restriction endonuclease recognizes and cleaves dsDNA with GATC on either strand. Why does E. coli have these two enzymes?
A) The enzymes cut the E. coli genome into pieces that bind to viral particles and inhibit viral replication. B) The enzymes increase the rate of mutation and genome rearrangement, thus increasing the likelihood that E. coli cells will mutate and become resistant to viral infection. C) The enzymes encourage lysogeny because the cleavage sites are recognized by viral integrases. D) The enzymes protect E. coli from infection by preferentially degrading viral or other exogenous DNA that is not methylated.
A scientist makes three artificial mRNA strands: (x) 5' AAAUUUAAAUUUAAAUUUAAAUUUAAA 3'(y) 5' UUUCCCUUUCCCUUUCCCUUUCCCUUU 3'(z) 5' AUAUAUAUAUAUAUAUAUAUAUAUAU 3'When he analyzes the polypeptides produced, he finds that:x produces a polypeptide that is 50% phenylalanine and 50%lysine.y produces a polypeptide that is 50% phenylalanine and 50% proline.z produces a polypeptide that is 50% isoleucine and 50% tyrosine.Based on these results only, the best conclusion to make is that
A. AAA codes for phenylalanine and AUA codes for isoleucine B. AUA codes for isoleucine C. AAA codes for phenylalanine D. AAA codes for lysine and AUA codes for isoleucine E. AAA codes for lysine
Gamma globulin can be given as immunotherapy to confer artificial passive immunity.
Answer the following statement true (T) or false (F)
A vesicle can be best compared to a:
A. micelle. B. lipid raft. C. liposome. D. bilayer.