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Nursing Question Bank

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1265 available questions

Biology · Question 331

Which is commonly described as the smallest self-replicating cellular organism?

  1. Adenovirus
  2. Mycoplasma
  3. Yeast
  4. Amoeba
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Correct answer: B

Mycoplasma

Mycoplasmas are among the smallest organisms capable of independent cellular growth and reproduction.

Biology · Question 332

At a resting heart rate of about 75 beats per minute, one complete cardiac cycle lasts approximately:

  1. 0.2 seconds
  2. 0.5 seconds
  3. 0.8 seconds
  4. 1.5 seconds
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Correct answer: C

0.8 seconds

Sixty seconds divided by 75 beats gives about 0.8 seconds per cardiac cycle.

Biology · Question 333

Hydrochloric acid in the stomach is secreted by which cells?

  1. Chief cells
  2. Parietal cells
  3. Goblet cells
  4. Beta cells
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Correct answer: B

Parietal cells

Parietal cells of the gastric glands secrete hydrochloric acid and intrinsic factor.

Biology · Question 334

Which pituitary hormone triggers ovulation?

  1. FSH
  2. Prolactin
  3. LH
  4. Growth hormone
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Correct answer: C

LH

A mid-cycle surge in luteinising hormone triggers ovulation.

Biology · Question 335

Which sphincter lies at the junction of the ileum and the large intestine?

  1. Pyloric sphincter
  2. Cardiac sphincter
  3. Anal sphincter
  4. Ileocecal sphincter
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Correct answer: D

Ileocecal sphincter

The ileocecal valve or sphincter controls passage from the ileum into the cecum.

Biology · Question 336

Which organelles are traditionally called the 'suicidal bags' of the cell?

  1. Lysosomes
  2. Ribosomes
  3. Centrioles
  4. Nucleoli
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Correct answer: A

Lysosomes

Lysosomes contain hydrolytic enzymes capable of digesting cellular material.

Biology · Question 337

Uremia refers to an abnormally high concentration of which waste substance in the blood?

  1. Glucose
  2. Bilirubin
  3. Urea
  4. Cholesterol
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Correct answer: C

Urea

Uremia is the clinical state associated with retention of urea and other nitrogenous wastes when kidney function is severely reduced.

Biology · Question 338

Receptors for steroid hormones are generally located:

  1. Only on the outer cell wall
  2. Inside lysosomes
  3. Only in blood plasma
  4. Inside target cells in the cytoplasm or nucleus
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Correct answer: D

Inside target cells in the cytoplasm or nucleus

Lipid-soluble steroid hormones cross the plasma membrane and bind intracellular receptors.

Biology · Question 339

Which endogenous substances help reduce pain perception in the central nervous system?

  1. Histamines
  2. Endorphins
  3. Insulins
  4. Thyroxines
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Correct answer: B

Endorphins

Endorphins are endogenous opioid peptides that reduce the perception of pain.

Biology · Question 340

Which chamber of the heart has the thickest myocardium?

  1. Right atrium
  2. Left atrium
  3. Right ventricle
  4. Left ventricle
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Correct answer: D

Left ventricle

The left ventricle pumps blood through systemic circulation and therefore has the thickest muscular wall.