2025 BIO 251 Exam 3 New Latest Version Best Studying
Material with All Questions from Actual Past Exam and
100% Correct Answers
Which of the following would be most likely to be detected by a Rig-like receptor (RLR)
A. Double stranded RNA
B. Helminth proteins
C. Bacterial DNA
D. LPS ---------- Correct Answer ------------ A. Double stranded RNA
Which of the following cells would likely have Toll-like receptors (TLRs)(choose all that apply)
A. Neutrophils
B. Dendritic cells
C. Mast cells
D. Hepatocytes
E. T-lymphocytes ---------- Correct Answer ------------ B. Dendritic cells
C. Mast cells
What chamber empties into the aorta?
A) right atrium
B) left ventricle
C) left atrium
D) right ventricle
E) AV bundle (bundle of His) ---------- Correct Answer ----------- B
What chamber has the thickest myocardium?
A) right atrium
B) left ventricle
C) left atrium
D) right ventricle
E) AV bundle (bundle of His) ---------- Correct Answer ----------- B
During isovolumetric contraction, which chamber has the greatest pressure?
A) right atrium
B) left ventricle
C) left atrium
D) right ventricle
E) AV bundle (bundle of His) ---------- Correct Answer ----------- B
Which chamber is connected to the pulmonary arteries?
A) right atrium
B) left ventricle
C) left atrium
D) right ventricle
,E) AV bundle (bundle of His) ---------- Correct Answer ----------- D
Which channel type allows sodium movement into the cell during the early spontaneous
depolarization in autorhythmic cells?
A) potassium channels
B) T-type calcium channels
C) funny channels
D) L-type calcium channels
E) voltage- gated sodium channels ---------- Correct Answer ----------- C
Which channel type allows calcium movement into the cell during the late spontaneous
depolarization in autorhythmic cells?
A) potassium channels
B) T-type calcium channels
C) funny channels
D) L-type calcium channels
E) voltage- gated sodium channels ---------- Correct Answer ----------- B
Which channel type allows ion movement out of the cell during repolarization of the
autorhythmim cells?
A) potassium channels
B) T-type calcium channels
C) funny channels
D) L-type calcium channels
E) voltage- gated sodium channels ---------- Correct Answer ----------- A
Which channel type is responsible for ion movement during the depolarization phase of the
autorhythmic cell action potential?
A) potassium channels
B) T-type calcium channels
C) funny channels
D) L-type calcium channels
E) voltage- gated sodium channels ---------- Correct Answer ----------- D
What channels open during the plateau phase of the cardiac contractile cell action potential?
A) potassium channels
B) T-type calcium channels
C) funny channels
D) L-type calcium channels
E) voltage- gated sodium channels ---------- Correct Answer ----------- D
Opening of what channels is responsible for the depolarization phase of the cardiac contractile
cell action potential?
A) potassium channels
B) T-type calcium channels
C) funny channels
Which component of an ECG represents ventricular depolarization?
A) P waVE
B) P-R interval
C) T wave
D) Q-T interval
E) QRS complex ---------- Correct Answer ----------- E
Which component of an ECG represents atrial depolarization?
A) P wave
B) P-R interval
C) T wave
D) Q-T interval
E) QRS complex ---------- Correct Answer ----------- A
Which component of an ECG represents ventricular repolarization?
A) P wave
B) P-R interval
C) T wave
D) Q-T interval
E) QRS complex ---------- Correct Answer ----------- C
Which component of an ECG represents ventricular systole?
A) P wave
B) P-R interval
C) T wave
D) Q-T interval
E) QRS complex ---------- Correct Answer ----------- D
Which of the following statements is FALSE?
A. The Fc region determines the class of an antibody
B. Helper T-cells secrete cytokines to support B-cell production
C. Once activated, a person will continue to produce IgG for the rest of their life
D. The goal of vaccination is to prime you to have a secondary response when exposed to the
pathogen ---------- Correct Answer ------------ C. Once activated, a person will continue to
produce IgG for the rest of their life
Which of the following would display antigens on an MHC I but not an MHC II?
A. Macrophage
B. Monocyte
C. Red Blood Cell
D. Neutrophil ---------- Correct Answer ------------ D. Neutrophil
In the thymus, T-cell that bind self antigens are:
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