Which of the following facts did Hershey and Chase make use of in trying to determine whether DNA or protein is the genetic material?
a) DNA contains phosphorus, whereas protein does not
b) DNA contains nitrogen, whereas protein does not
c) DNA contains purines, whereas protein includes pyrimidines
d) DNA contains sulfur, whereas protein does not
Ans: a) DNA contains phosphorus, whereas protein does not
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Which of the following occurs in the collecting ducts?
A. regulation of final urine concentration B. filtration C. reabsorption of key electrolytes and solutes D. secretion of additional wastes E. All of these answer options are correct.
The clonal selection theory is an explanation for
A. how a single type of stem cell can produce both red blood cells and white blood cells. B. how antibody proteins can be molded to fit antigens after the antigen interacts with the antibody-producing type of cell. C. how an antigen can induce the multiplication of very few cells to result in production of high levels of specific antibodies. D. how HIV can disrupt the immune system. E. how macrophages can recognize specific T cells and B cells.
In the human body, alcohol dehydrogenase (ADH) converts alcohol to ________
a. CO2 and H20 b. pyruvate c. acetaldehyde d. acetate
The sour flavor in some fermented foods is usually the result of (acetic/benzoic/lactic) acid production
What will be an ideal response?