In the following gene sequence, the original sequence is ABC* DEFGH. It now reads ABC* DGFEH. The * indicates the centromere. This type of mutation is a(n)
A) nonsense mutation.
B) inversion.
C) translocation.
D) duplication.
E) point mutation.
B) inversion.
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The blood vessels of the umbilical cord are formed by which extraembryonic membrane?
a. yolk sac b. chorion c. allantois d. amnion e. placenta
Four of the five answers listed below are
related by a similar effectiveness. Select the EXCEPTION.
a. the Pill b. tubal ligation c. vasectomy d. douching e. IUD
F. acidarmanus, a species of bacteria that lives in California copper mines, has adapted to its environment by altering
the ____ at which its enzymes function.
a. temperature b. pH c. light levels d. substrate concentration e. salt concentration
The membrane attack stage of the complement cascade involves
A. C1q binds to surface receptors on a membrane. B. cleaving of C3 to yield C3a and C3b. C. initiation of the cascade. D. production of inflammatory cytokines. E. the assembly of a ring-shaped protein that forms holes in bacterial cell membranes and virus envelopes.