A molecule that is organic is primarily composed of:
a. water
b. oxygen
c. hydrogen only
d. carbon only
e. hydrogen and carbon
e
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You modify the primary sequence of an enzyme in a region that will be the active site when the protein
is properly folded. What is the predicted outcome of this change?
a. The enzyme will not properly bind to the substrate. b. The enzyme will not be able to bind an allosteric inhibitor. c. The enzyme will have an increased rate of activity. d. There will be no change in the enzyme's function. e. The enzyme will bind the substrate but not be able to release the products.
Sometimes when I have my morning coffee, which I drink black with no cream or sugar, I notice a thin film floating on top of the coffee
Since I have just read Chapter 3 of the text, I now realize the nature of this substance and so I run to my friend screaming, "Look at this ________ in my coffee!" A) hydrophilic substance B) hydrophobic substance C) disaccharide D) polysaccharide
Diffusion of materials from outside to the middle of a cell depends upon
A. the thickness of the cell membrane. B. the distance from the surface to the middle of the cell. C. the age of the cell. D. osmosis.
Signaling by cadherins is an example of _______ signaling.
a. autocrine b. endocrine c. paracrine d. direct cell-to-cell