Question 1

Which of the following best describes the process of dehydration synthesis as illustrated in the first image?

Accepted Answer

Two monomers are joined by removing a water molecule, forming a covalent bond.

Question 2

Which type of bond is formed between amino acids during protein synthesis, as shown in the peptide bond diagram?

Accepted Answer

Peptide bond

Question 3

In the secondary structure of proteins, which type of interaction stabilizes the α-helix and β-pleated sheet?

Accepted Answer

Hydrogen bonds

Question 4

Which of the following statements about DNA and RNA is correct based on the third image?

Accepted Answer

DNA is double-stranded and contains thymine, while RNA is single-stranded and contains uracil.

Question 5

Which carbohydrate polymer is the main structural component of plant cell walls, as shown in the fourth image?

Accepted Answer

Cellulose

Question 6

The molecule shown in the fifth image is a monosaccharide. Which functional group is present in this molecule?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 7

Which of the following statements about saturated and unsaturated fatty acids, as shown in the sixth image, is correct?

Accepted Answer

Unsaturated fatty acids contain at least one double bond between carbon atoms.

Question 8

Which of the following best describes the function of the molecule shown in the seventh image (micelle structure)?

Accepted Answer

It aids in the transport and absorption of lipids in aqueous environments.

Question 9

The eighth image shows the structure of a nucleotide. Which components are present in a nucleotide?

Accepted Answer

Phosphate group, five-carbon sugar, nitrogen-containing base

Question 10

The sterol backbone shown in the ninth image is characteristic of which class of biological molecules?

Accepted Answer

Steroids

Question 11

Which of the following is a correct description of the relationship between structure and function in biological molecules?

Accepted Answer

Structure determines function; changes in structure can alter biological activity.

Question 12

Which of the following equations correctly represents the calculation of pH?

Accepted Answer

$$	ext{pH} = -\log [H^+]$$

Question 13

Which of the following is NOT a function of proteins?

Accepted Answer

Information storage

Question 14

Which functional group is ionizing and acidic, commonly found in fatty acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 15

Which of the following statements about the denaturation of proteins is correct?

Accepted Answer

Denaturation can be caused by changes in pH, temperature, or salt concentration.

Question 16

Which of the following is a correct example of a redox reaction?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 17

Which of the following molecules is amphipathic, containing both hydrophobic and hydrophilic regions?

Accepted Answer

Phospholipid

Question 18

Which of the following is a polymer formed by glycosidic covalent bonds?

Accepted Answer

Polysaccharide

Question 19

Which of the following is a correct description of a buffer?

Accepted Answer

A buffer can act as both a proton donor and acceptor, helping maintain pH.

Question 20

Which of the following is true about the elements commonly found in living organisms?

Accepted Answer

CHNOPS are the most common elements in living organisms.

Biochemistry Foundations for Microbiology: Structure and Function of Biological Molecules

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