An infected individual who is a potential source of infection for others and plays an important role in the epidemiology of the disease is a/an ________.
A. carrier
B. host
C. reservoir
D. index case
Answer: A
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Arrange the following steps in the pathway activated by G protein-coupled receptors. Write the letter
of the first step next to 1 and the letter of the last step next to 5.
A. Activation of effector B. Activation of protein kinases C. Receptor binds first messenger D. Production of second messenger E. Activation of G protein 1. 2. 3. 4. 5.
Cytoplasmic division (cytokinesis)
a. differs in plant and animal cells. b. usually accompanies nuclear division. c. involves microtubules and/or actin filaments. d. in plant cells utilizes an established zone marking the plane of division. e. does all of these.
Which of the following is/are TRUE regarding vasopressin?
a. vasopressin is also known as antidiuretic hormone (ADH) b. vasopressin increases water retention in the kidney c. vasopressin reduces urine production d." diabetes insipidus" is a condition caused by vasopressin deficiency that results in higher levels of urine production e. all of the above
Albinism, lack of pigmentation in humans, results from an autosomal recessive gene. Two parents with normal pigmentation have an albino child. What is the probability that their next three children will be wild type?
A) 3/8 B) 1/32 C) 0% D) 3/64 E) 1/4