One way to regulate gene expression is through the production of different sigma factors. These cause RNA polymerase to bind to different sets of promoters, thereby altering the pattern of gene expression.
Answer the following statement true (T) or false (F)
True
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Postreplication repair is a system that responds after damaged DNA has escaped repair and failed to be completely replicated
Indicate whether the statement is true or false
Newly synthesized membrane lipids are found in both halves of membrane bilayers because they are
a. synthesized on both surfaces. b. removed and transported to these locations by lipid transport proteins. c. synthesized on one surface and flip spontaneously to the other surface. d. synthesized on one surface and flipped to the other surface by proteins called flippases.
In a 3-point test cross, the least common offspring phenotypes always result from the ____________
a) non-recombinant gametes b) recombinant gametes from a single cross over between the first and middle gene c) recombinant gametes from a single cross over between the middle and last gene d) gametes from double crossovers
Why is it difficult for protons (H+) to move across phospholipid bilayer membranes?
A. Protons are too hydrophobic to pass through membranes. B. Protons are too large to pass through the membrane. C. There are no proteins in membranes to allow protons through. D. The positive charge on protons prevents them from passing through the hydrophobic interior of membranes.