Practice Exam (Exam 1)

Question 1

1. Physiological changes that occur in anticipation of a future change to a homeostatic variable are called ____ processes
   a) Negative Feedback
   b) Forward Feedback
   c) Feedforward Regulation
   d) Dynamic Constancy
   e) Positive Feedback

Answer 1

C) feedforward regulation

Question 2

4. Which ONE of the following statements is TRUE?
   a) Cystic fibrosis is caused by defective aquaporins
   b) A lack of vasopressin will increase the volume of extracellular fluid (ECF)
   c) The Na+/K+ pump is powered by cAMP
   d) Iron uptake by cells depends on phagocytosis
   e) Cholesterol increases the viscosity of a membrane

Answer 2

cholesterol increases the viscosity of a membrane

Question 3

21. Preventing the interaction of glucose-6-phosphate back on hexokinase will result in _____
    a) inhibition of the Krebs cycle
    b) cell lysis
    c) decreased PKA activation
    d) proteolysis
    e) glycogen synthase activation

Answer 3

B) cell lysis

Question 4

22. For one cycle of beta-oxidation, __________ goes in and _________ comes out
    a) Pyruvate; 3 NADH, 1 FADH, 1 ATP
    b) 1 Carbon; 6 NAHD, 1 Acetyl CoA, 2 ATP
    c) 2 Pyruvate; 1 NADH, 1 FADH, 1 Acetyl CoA
    d) 2 Carbons; 6 NADH, 2 FADH, 2 Acetyl CoA
    e) 2 Carbons; 1 NADH, 1 FADH, 1 Acetyl CoA

Answer 4

e) 2 carbons, 1 nadh, 1 fadh, 1 acetyl coa

Question 5

24. Which ONE of the following statements is FALSE?
    An Action Potential ___________
    a) Can be generated in the axon hillock
    b) Does not occur in the dendrites of most neurons
    c) Involves a two-gated voltage-dependent Na+ channel
    d) Can be depolarizing or hyperpolarizing
    e) Can involves salutatory conduction

Answer 5

d) can be depolarizing or hyperpolarizing

Question 6

25. Which one of the following is rich at the axon hillock?
    a) Leak K+ channel
    b) Leak Na+ channel
    c) Voltage-gated Na+ channel
    d) Mechanically-gated Na+ channel
    e) Ligand-gated Na+ channel

Answer 6

c) VG Na+ channel

Question 7

if someone has diabetes insipidus, they have a ____ hydration state

Answer 7

hypertonic dehydration

Question 8

if someone is excreting excessive ADH (aldesterone) they have a ____ hydration state

Answer 8

isotonic overhydration