Question 1

Which of the following statements best describes the difference between a cation and an anion?

Accepted Answer

A cation has lost electrons and has a positive charge, while an anion has gained electrons and has a negative charge.

Question 2

Which of the following best explains why water is an excellent solvent for polar substances?

Accepted Answer

Water molecules have polar covalent bonds, allowing them to interact with other polar molecules through hydrogen bonding.

Question 3

A solution is made by dissolving 5 grams of NaCl in 500 mL of water. What is the weight-volume proportion of this solution?

Accepted Answer

$$0.01\, \mathrm{g/mL}$$\ or\ 1\%$

Question 4

Which of the following functional groups is represented by the formula $$\mathrm{R-COOH}$$?

Accepted Answer

Carboxyl group

Question 5

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction that removes water to form a covalent bond between monomers.

Question 6

Which of the following is true regarding isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 7

Which of the following molecules is amphipathic and forms the basis of biological membranes?

Accepted Answer

Phospholipids

Question 8

A patient’s arterial blood pH is measured at 7.25. Which condition does this indicate?

Accepted Answer

Acidosis

Question 9

Which of the following best describes the primary structure of a protein?

Accepted Answer

The linear sequence of amino acids joined by peptide bonds.

Question 10

Which of the following statements about DNA and RNA is correct?

Accepted Answer

Both DNA and RNA are made of nucleotides connected by phosphodiester bonds.

Question 11

Which of the following best explains why saturated fats are solid at room temperature?

Accepted Answer

They lack double bonds, allowing the fatty acid chains to pack tightly together.

Question 12

Which of the following is a function of carbohydrates in cells?

Accepted Answer

Serving as structural biomolecules in cell walls

Question 13

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases more energy than is spent to start the reaction, with products having lower energy than reactants.

Question 14

Which of the following is a correct example of a synthesis (dehydration) reaction?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + \mathrm{C_6H_{12}O_6$} \rightarrow \mathrm{C$$_{12}$$H_{22}O$$_{11}} + \mathrm{H_2O}$

Question 15

Which of the following best describes the role of ATP in cells?

Accepted Answer

ATP stores and releases energy when its phosphate bonds are broken.

Question 16

Which of the following statements about protein folding is correct?

Accepted Answer

Protein folding can be complex and sometimes requires chaperones to mediate the process.

Question 17

Which of the following is a property of amphipathic molecules?

Accepted Answer

They have both hydrophilic and hydrophobic regions.

Question 18

Which of the following best describes the difference between a monosaccharide and a disaccharide?

Accepted Answer

A monosaccharide is a single sugar unit, while a disaccharide consists of two monosaccharides linked by a glycosidic bond.

Question 19

Which of the following best explains why enzymes are important in biochemical reactions?

Accepted Answer

They lower the activation energy, increasing the rate of reactions.

Biochemistry Basics for Microbiology Students

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