Q: Which equation correctly represents the calculation of osmolarity?

$$\text{Osmolarity} = \frac{\text{Number of osmoles}}{\text{Liters of solution}}$$

Question 1

Which of the following best describes the difference between organic and inorganic compounds in biochemistry?

Accepted Answer

Organic compounds always contain carbon and hydrogen atoms bonded together, while inorganic compounds generally do not contain carbon (with some exceptions like CO$$_2$$ and CO).

Question 2

Water is considered an excellent solvent in biological systems. Which property of water allows it to dissolve hydrophilic molecules easily?

Accepted Answer

Its polarity, which enables it to interact with charged and polar substances.

Question 3

A patient is experiencing muscle spasms and cardiac arrhythmias. Blood tests reveal low potassium levels. Which electrolyte imbalance is most likely responsible?

Accepted Answer

Hypokalemia (low K$$^+)$$

Question 4

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

Accepted Answer

Ice is less dense than liquid water due to the arrangement of water molecules in a solid state.

Question 5

Osmosis is defined as:

Accepted Answer

The movement of water from an area of low osmolarity to an area of high osmolarity across a semipermeable membrane.

Question 6

A red blood cell is placed in a hypertonic saline solution. What will happen to the cell?

Accepted Answer

Water will leave the cell, causing it to shrink (crenate).

Question 7

Which equation correctly represents the calculation of osmolarity?

Accepted Answer

$$	ext{Osmolarity} = \frac{	ext{Number of osmoles}}{	ext{Liters of solution}}$$

Question 8

Which of the following is NOT a function of salts (electrolytes) in the human body?

Accepted Answer

Providing genetic information for protein synthesis.

Question 9

A patient with diabetes develops ketoacidosis. Which of the following best describes the change in blood pH?

Accepted Answer

Decrease in pH, leading to acidosis.

Question 10

Which of the following statements about the pH scale is correct?

Accepted Answer

It measures the concentration of H$$^+$$ ions in a solution on a logarithmic scale.

Question 11

Which of the following is a correct example of a monosaccharide?

Accepted Answer

Glucose

Question 12

Which of the following best describes the structure of a phospholipid?

Accepted Answer

A molecule with a hydrophilic (polar) head and two hydrophobic (non-polar) tails.

Question 13

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Storing genetic information.

Question 14

Which level of protein structure is primarily determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 15

Which of the following is a function of nucleic acids in living cells?

Accepted Answer

Carrying genetic information and directing protein synthesis.

Question 16

A solution has a pH of 3. Which of the following statements is true?

Accepted Answer

The solution is acidic and has a high concentration of H$$^+$$ ions.

Question 17

Which of the following best describes ATP (adenosine triphosphate)?

Accepted Answer

It is the primary energy-transferring molecule in the body.

Question 18

Which of the following scenarios would most likely result in metabolic alkalosis?

Accepted Answer

Excessive vomiting leading to loss of HCl from the stomach.

Question 19

Which of the following is a correct statement about cellulose?

Accepted Answer

It is a polysaccharide that cannot be digested by the human GI tract.

Question 20

Which of the following is a steroid hormone?

Accepted Answer

Testosterone

Biochemistry Foundations for Psychology: Organic and Inorganic Compounds in Human Health

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