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Nursing Question Bank

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1265 available questions

Biology · Question 161

Plasma makes up about what percentage of blood?

  1. 90%
  2. 25%
  3. 45%
  4. 55%
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Correct answer: D

55%

Plasma typically accounts for approximately 55 percent of whole-blood volume.

Biology · Question 162

The structure of the cell membrane is explained by the:

  1. Lock and key model
  2. Sliding filament model
  3. Fluid mosaic model
  4. Double helix model
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Correct answer: C

Fluid mosaic model

The fluid mosaic model describes a dynamic lipid bilayer with associated proteins.

Biology · Question 163

Which organelle contains digestive enzymes?

  1. Nucleus
  2. Ribosome
  3. Chloroplast
  4. Lysosome
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Correct answer: D

Lysosome

Lysosomes contain enzymes that digest cellular material.

Biology · Question 164

Who used the term cells for the compartments he observed in cork in 1665?

  1. Robert Hooke
  2. Louis Pasteur
  3. Robert Koch
  4. Charles Darwin
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Correct answer: A

Robert Hooke

Robert Hooke named the compartments he observed in cork cells in 1665.

Biology · Question 165

Which pair formulated the foundational cell theory for plants and animals?

  1. Schleiden and Schwann
  2. Hooke and Brown
  3. Watson and Crick
  4. Mendel and Morgan
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Correct answer: A

Schleiden and Schwann

Schleiden and Schwann established the foundational cell theory for plants and animals.

Biology · Question 166

Which mature human cell has no nucleus?

  1. Liver cell
  2. Red blood cell
  3. White blood cell
  4. Neuron
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Correct answer: B

Red blood cell

Mature human red blood cells normally lack a nucleus.

Chemistry · Question 167

Mass number is the sum of:

  1. Electrons only
  2. Protons and electrons
  3. Neutrons and electrons
  4. Protons and neutrons
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Correct answer: D

Protons and neutrons

Mass number counts protons plus neutrons in a nucleus.

Chemistry · Question 168

The electron was discovered by:

  1. J.J. Thomson
  2. Chadwick
  3. Rutherford
  4. Bohr
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Correct answer: A

J.J. Thomson

J. J. Thomson identified the electron through cathode-ray experiments.

Chemistry · Question 169

The principal bonding in solid sodium chloride is:

  1. Coordinate
  2. Covalent
  3. Metallic
  4. Ionic
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Correct answer: D

Ionic

Solid sodium chloride consists of oppositely charged ions held by electrostatic attraction.

Chemistry · Question 170

Which noble gas has only 2 electrons?

  1. Argon
  2. Helium
  3. Krypton
  4. Neon
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Correct answer: B

Helium

A neutral helium atom has atomic number 2 and two electrons.