The ?-jelly roll of the Lpt system functions to ________.
A. help anchor the newly positioned LPS on the bacterial cell surface
B. help translocate assembled LPS across the outer membrane of the bacterial cell
C. help attach the O-antigen to core oligosaccharide moieties during synthesis of LPS
D. help hide lipid A from the hydrophilic periplasm during LPS transport to the membrane
Answer: D
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In insects, the level of ____ controls the formation of a pupa
a. molt-inhibiting hormone b. juvenile hormone c. prothoracicotropic hormone d. ecdysone e. insulin-like hormone
Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Researchers discover that guard cells of the lady slipper orchid lack chloroplasts; yet the guard cells regularly open and close.
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.
One surprising finding in the Human Genome Project was that what percentage of the genome encodes a functional product?
A. 98% B. 50% C. 2% D. It varies based on the individual.
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Figure 31.8A
The accompanying figure is a micrograph of what kind of tissue?
A. Cardiac muscle B. Skeletal muscle C. Smooth muscle D. Cartilage E. Dense connective