T-independent antigens
A) may be polysaccharides or proteins, and are not able to bind multiple B cell receptors on a given B cell.
B) are usually polysaccharides and able to bind multiple B cell receptors on a given B cell.
C) are able to bind multiple B cell receptors on a given B cell.
D) are usually proteins.
E) are usually polysaccharides.
Answer: B
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A human cell has a mutation in the gene that encodes the enzyme that generates lactate from pyruvate, rendering that enzyme completely non-functional. Assuming that there is ample glucose present, how would this cell generate energy in the presence of oxygen?
A. Glycolysis coupled with ethanol fermentation B. Aerobic respiration C. Primarily through the break down of proteins into amino acids D. This cell would have no way to generate energy under these conditions because it cannot carry out the reactions needed for glycolysis Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about how cells use multiple fuels to generate energy? How does this relate to the inability of the cell to convert pyruvate into lactate? What other information is related to the question? Choose Answer Do you have all necessary information to determine which products would affect cellular respiration? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ l+ b+ b+) and (l+ l- b+ b-) flies are normal, but ( l- l- b- b-) flies don't move around very much and cannot detect the location of a light source. You perform a testcross and get the following results:
listless, sighted 100 listless, blind 400 normal activity, sighted 400 normal activity, blind 100 What is the distance between these two genes on the chromosome? A. They are on different chromosomes. B. They are 10 map units apart. C. They are 20 map units apart. D. They are 40 map units apart. E. They are 80 map units apart.
The pRB protein associated with retinoblastoma, if normal and present,
A. prevents the cell from moving from G1 to S. B. causes the cell to move from G1 to S. C. prevents the cell from moving from G2 to M. D. causes the cell to move from G2 to M. E. causes the cell to move from S to G2.
equilibrium water vapor potential
What will be an ideal response?