Question 1

Which type of bond between carbon and other atoms is generally the strongest, and why is this strength biologically significant?

Accepted Answer

Covalent bonds; because their strength provides stability to biological molecules such as DNA and proteins.

Question 2

A calorie is best defined as:

Accepted Answer

The amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius.

Question 3

Hydrocarbons are typically found in which part of a cell, and what is their main property?

Accepted Answer

In the plasma membrane; they are hydrophobic and contribute to membrane structure.

Question 4

Which of the following is NOT a common functional group found in biological molecules?

Accepted Answer

Nitride group ($$\mathrm{-N$$^{3-}$$})$$

Question 5

Polarity in a molecule refers to:

Accepted Answer

The unequal sharing of electrons between atoms, resulting in partial charges.

Question 6

Why is water's high specific heat biologically important?

Accepted Answer

It allows organisms to maintain stable internal temperatures despite external fluctuations.

Question 7

Which property of water is most directly responsible for the movement of water from roots to leaves in plants?

Accepted Answer

Cohesion and adhesion

Question 8

A solution is separated from pure water by a membrane that only allows water to pass. If the solution contains a high concentration of solute, what will happen?

Accepted Answer

Water will move into the solution by osmosis.

Question 9

What is the primary function of an aquaporin in a cell membrane?

Accepted Answer

To facilitate the rapid movement of water molecules across the membrane.

Question 10

A molecule described as amphipathic would:

Accepted Answer

Have both hydrophilic and hydrophobic regions.

Question 11

Which of the following best explains why hydrocarbons are generally insoluble in water?

Accepted Answer

They are nonpolar and cannot form hydrogen bonds with water.

Question 12

Which of the following functional groups is most likely to act as a base in a biological molecule?

Accepted Answer

Amino group ($$\mathrm{-NH_2$})$$

Question 13

A patient is given an intravenous solution that is hypotonic relative to their blood plasma. What is the most likely cellular response?

Accepted Answer

Cells will swell as water enters by osmosis.

Question 14

Which property of water allows insects to walk on its surface?

Accepted Answer

High surface tension

Question 15

Which of the following best describes the role of hydrogen bonds in the structure of water?

Accepted Answer

They allow water molecules to stick together, giving water its cohesive properties.

Question 16

If a molecule contains both a carboxyl group and an amino group, it is most likely:

Accepted Answer

An amino acid

Question 17

Which of the following equations best represents the process of osmosis?

Accepted Answer

$$\mathrm{H_2O}$$ moves from an area of low solute concentration to an area of high solute concentration across a semipermeable membrane.

Question 18

Which of the following is NOT one of the five key properties of water relevant to biology?

Accepted Answer

High compressibility

Question 19

A cell membrane is primarily composed of phospholipids. Which property of phospholipids is most important for membrane formation?

Accepted Answer

They are amphipathic, with both hydrophilic heads and hydrophobic tails.

Question 20

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds in ice create a lattice that is less dense than liquid water.

Fundamental Chemical Principles in Cell Biology

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