What does a mutagen cause?
A. problems with mitosis
B. a reduction in the number of tRNA molecules available for protein synthesis
C. decreased permeability of the nuclear envelope
D. a change in the sequence of DNA
E. decreased enzyme activity throughout the cell
Ans: D. a change in the sequence of DNA
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When you are jogging, your muscles are using more oxygen and releasing more carbon dioxide into the blood than when you are at home on the couch. Which of the following would occur during your jog?
A) Blood pH would become more basic. B) The concentration of bicarbonate ions (HCO3-) in the blood would decrease. C) The medullary respiratory center would detect rising carbon dioxide levels. D) The volume of the dead air space would decrease.
Lysogeny is unique to bacteriophages; similar relationships have not been found among the animal viruses
Indicate whether the statement is true or false.
Which of the following is not involved in vasodilation or vasoconstriction?
a. hot or cold temperatures b. hormones c. oxygen supply d. nitric oxide e. angiotensin
Suppose that the allele for brown eyes (B) is dominant to the allele for hazel eyes (b). If both parents have brown eyes
and are heterozygous (Bb), what are the chances that their first child will have hazel eyes? Brown eyes? What are the chances that if they have two children, both will have hazel eyes? What will be an ideal response?