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
ANSWER: d
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The rate of a reaction catalyzed by an enzymes usually ________ with temperature; however, at temperatures above the optimum range ________
A) increases; protein denaturation occurs B) increases; the reaction proceeds without the enzyme C) decreases; the reaction proceeds without the enzyme D) increases; the direction of the reaction reverses E) decreases; prosthetic groups are necessary
After RNA polymerase binds to the promoter sequence and causes the adjacent double-strand DNA to
unwind, only one strand can be used as the template for RNA formation. Indicate whether the statement is true or false.
Linnaeus simplified scientific classification by developing:a
clades. b. kingdoms. c. supergroups. d. phylogenetic trees. e. binomial system of nomenclature
Which of the following has NOT been a basis for classification of the protozoa?
A) means of locomotion B) genetic sequences C) photosynthetic ability D) habitat E) ability to form a dormant stage