Isotype switching occurs when
A) an antibody changes which class it is.
B) an antibody changes epitope it can recognize.
C) a B cell changes which antibody class it is producing.
D) a B cell switches which epitope it recognizes.
E) activated B cells differentiate into either plasma or memory cells.
Answer: C
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A pathogenic bacterial species has mutated and is no longer able to synthesize a capsule. Which outcome would you predict?
A. The mutated bacteria will be more virulent. B. The mutated bacteria will be protected from plasmolysis in hypertonic environments. C. The mutated bacteria will not be able to cause disease as readily. D. The mutated bacteria will undergo osmotic lysis in hypotonic environments.
Why isn't the endometrium shed during a pregnancy?
What will be an ideal response?
The tRNA shown in the figure above has its end projecting beyond its end. What will occur at this end?
A) The amino acid binds covalently. B) The excess nucleotides (ACCA) will be cleaved off at the ribosome. C) The small and large subunits of the ribosome will attach to it. D) The cap of the mRNA will become covalently bound.
Of the following combination of statements about protostomes and deuterostomes, which choice is correct?
A. Protostomes are animals in which the anus develops from the blastopore, and the mouth develops from the second opening. Deuterostomes are animals in which the anus develops from the blastopore, and the mouth develops secondarily later in their development. B. Protostomes are animals in which the mouth develops from the blastopore, and the anus or anal pore develops from the second opening. Deuterostomes are animals in which the mouth develops from the blastopore, and the anus develops secondarily later in their development. C. Protostomes are animals in which the mouth or anus develops from the blastopore, depending on the species. Deuterostomes are animals in which the mouth and anus develops from the blastopore, depending on the species. D. Protostomes are animals in which the mouth develops from the blastopore, and the anus or anal pore develops from the second opening. Deuterostomes are animals in which the anus develops from the blastopore, and the mouth develops secondarily later in their development.