How do HIV and Influenza viruses differ?
A. HIV does not require a living cell as a host in order to survive.
B. Influenza changes using rapid mutation.
C. They evade the immune system in different ways.
D. They experience the effects of an antigenic shift in different ways.
Ans: C. They evade the immune system in different ways.
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The human body's arterial blood pH is tightly maintained around 7.4 by buffering agents that bind hydrogen ions to stop any change in pH. If an acid-base imbalance overcomes the buffer system, the body changes the ventilation rate, or the rate at which gas enters or leaves the lungs. Changing the ventilation rate changes the concentration of CO2 in the blood, which alters the pH of the blood. In this case, pH 7.4 is the:
A. homeostatic challenge. B. sensor. C. effector. D. integrator. E. set point.
The amount of energy released from a glucose
molecule is dependent on what happens to
a. carbon atoms. b. oxygen atoms. c. hydrogen atoms. d. phosphorus atoms. e. water molecules
The major difference between the smooth and rough ER is that ____
a. smooth ER is isolated to the nucleus b. vesicles are found only in the smooth ER c. rough ER contains ribosomes d. smooth ER is the site of polypeptide synthesis e. rough ER is the site of lipid synthesis
Which of the following statements characterizes PCR?
a. PCR can be performed with any DNA polymerase. b. PCR is only useful for amplifying large quantities of DNA in vitro. c. PCR replicates specific DNA sequences. d. PCR has not been successful for archaeological and crime scene analyses. e. PCR utilizes Taq polymerase, which active only at low temperatures