The ?-jelly roll of the Lpt system functions to
A. help translocate assembled LPS across the outer membrane of the bacterial cell.
B. help attach the O-antigen to core oligosaccharide moieties during synthesis of LPS.
C. help anchor the newly positioned LPS on the bacterial cell surface.
D. help hide lipid A from the hydrophilic periplasm during LPS transport to the membrane.
Answer: D
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Which of the following occurs in the last stage of viral replication?
a. New viral particles are released into the host organism. b. Viral RNA is used to make viral proteins, which infect the host. c. The viral envelope fuses with the cell membrane. d. The viral capsid degrades and nucleic acid is released.
During stress, ACTH is produced by the _______ and acts on target cells in the ______
a. hypothalamus; adrenals b. hypothalamus; pituitary c. pituitary; hypothalamus d. pituitary; adrenals e. adrenals; hypothalamus
What is the map distance between the pr and cn genes?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) 20 m.u.
B) 2 m.u.
C) 4 m.u.
D) 46 m.u.
E) 8 m.u.
Which of the following is (are) a subphylum(a) of
Chordata? a. Urochordata b. Hemichordata c. Cephalochordata d. Vertebrata e. Urochordata, Cephalochordata, and Vertebrata