The most likely cells to be lysed when treated with anti-CD4 antibody and complement are
A. Cytotoxic t cells
B. Macrophages
C. Helper T cells
D. B cells
Ans: C. Helper T cells
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The Hershey and Chase experiments, in which radioactive phosphorus (32P) and radioactive sulfur (35S) were used,
demonstrated that ____.
a. DNA labeled with 35S and proteins labeled with 32P can be traced over the course of an experiment b. DNA labeled with 32P is transferred from the bacteriophage to the virus c. proteins labeled with 35S become deactivated and unable to be transferred d. bacteriophages transfer their DNA, not their coat proteins, into their hosts e. DNA may be the hereditary material, although bacteriophages transfer both DNA and proteins into their hosts
The amount of observable variation due to the environment can be measured by comparing the
number, frequency and kinds of alleles in both parents and offspring. _________ Indicate whether the statement is true or false.
The type of body cavity seen in the roundworms that develops between mesoderm and endoderm layers is a
A. pseudocoelom. B. mantle. C. coelom. D. acoelom.
Lead toxicity effects include all of the following except
Select one: a. anemia. b. abnormal reproduction. c. kidney disease. d. reduced learning capacity.