What two enzymes do DNA researchers need
to cut and paste DNA from different sources?
a. restriction and ligases
b. restriction and polymerases
c. ligases and polymerases
d. restriction and helicases
e. helicases and polymerases
A
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Which of the following is NOT true of small effector molecules?
A. They can cause a conformational change in a regulatory protein. B. They can prevent a repressor from binding a gene region. C. They can regulate gene transcription by binding to DNA. D. They can regulate gene transcription by binding a regulatory protein.
One of Mendel's major contributions to the study of heredity was the application of
____________________ in analyzing results of crosses. Fill in the blank(s) with the appropriate word(s).
You have been advised to check your pulse during exercise in order to monitor your heart rate. What is happening in your heart as your pulse is produced?
A) ventricular diastole B) atrial diastole C) the aortic valve and pulmonary valves are closing D) ventricular systole E) atrial systole
Which of the following is a major category of animal tissue?
A) epithelium B) heart C) lymph D) biceps