#Question id: 2237
#Unit 2. Cellular Organization
Glucose enters erythrocytes via a GLUT-1 uniporter. As the levels of glucose in the bloodstream decrease between meals, what happens to the glucose in the cells?
#Question id: 10826
#Unit 10. Ecological Principles
Gause's principle of competitive exclusion is, essentially,
#Question id: 931
#Unit 1. Molecules and their Interaction Relevant to Biology
The major site of formation of acetoacetate from fatty acids is the:
#Question id: 6967
#Unit 5. Developmental Biology
Gastrulation in sea urchins, Drosophila, and Xenopus all begin with a change in cell shape, in which the apical surface of an epithelial sheet contracts. This process is called:
#Question id: 4456
#Unit 3. Fundamental Processes
Correct statement about two striking structural changes are seen in the enzyme upon isomerization from the closed to the open complex;
A. First, the pincers at the front of the enzyme clamp down tightly on the downstream DNA.
B. Second, there is a major shift in the position of the amino-terminal region of s. When not bound to DNA, s region 3.2 lies within the active center cleft of the holoenzyme, blocking the path that, in the open complex, is followed by the template DNA strand.
C. In the open complex, region 1.1 shifts some 50 A˚ and is now found on the outside of the enzyme, allowing the DNA access to the cleft.
D. Region 1.1 of s is highly negatively charged ( just like DNA).