The activation of the SOS system in a bacterium infected with a prophage results in
A. destruction of the viral genes.
B. complete lysis of the bacterial culture.
C. mutation of the DNA.
D. destruction of the viral repressor through host protease activity.
E. complete lysis of the bacterial culture AND destruction of the viral repressor through host protease activity.
E
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Cann's studies involving mitochondrial DNA showed that the two deepest branches of the human family tree are African. Which of the following observations explains this statement?
A. that all humans evolved in Africa and only later migrated to other places B. that our closest ancestors moved out of Africa and then evolved into humans C. that our closest ancestors migrated to two other continents D. that all the humans that evolved in Africa only migrated to two continents E. None of the answer options is correct.
Which of the following gives the most accurate measure of relative economic prosperity?
A) purchasing power parity B) GDP per capita C) GNP per capita D) national income
The bladder lies within the ___ cavity
a. abdominal b. thoracic c. pelvic d. cranial e. spinal
Triiodothyronine (T3) is secreted by
a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the adrenal medulla. e. the adrenal cortex