Question 1

Which chemical group is responsible for making amino acids behave as bases in aqueous solutions?

Accepted Answer

Amino group ($$-\mathrm{NH}_2)$$

Question 2

A patient with Galactosemia cannot metabolize galactose properly. Which type of macromolecule is directly responsible for catalyzing the breakdown of galactose?

Accepted Answer

Proteins (enzymes)

Question 3

Which of the following best explains why unsaturated fatty acids are liquid at room temperature?

Accepted Answer

They contain double bonds that create kinks, preventing tight packing.

Question 4

Which level of protein structure is primarily stabilized by hydrogen bonds between backbone atoms?

Accepted Answer

Secondary structure

Question 5

A DNA strand has the sequence 5'-ATCGGTA-3'. What is the complementary sequence, including polarity?

Accepted Answer

3'-TAGCCAT-5'

Question 6

Which of the following is a major structural difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 7

Which of the following best describes the role of carbon-carbon double bonds ($$C=C) in $$fatty acids?

Accepted Answer

They create kinks in the hydrocarbon chain, affecting membrane fluidity.

Question 8

Which of the following is NOT a function of phospholipids in biological systems?

Accepted Answer

Serving as major energy storage molecules

Question 9

A mutation causes a change in the primary structure of a protein. Which of the following is most likely to be affected as a result?

Accepted Answer

All higher levels of protein structure (secondary, tertiary, quaternary)

Question 10

Which chemical group is found in all nucleotides and is essential for linking them together in nucleic acids?

Accepted Answer

Phosphate group ($$-\mathrm{PO}_4$$^{2-}$$)

Question 11

Which of the following best explains why cellulose is not digestible by humans?

Accepted Answer

Humans lack the enzyme to break the $$\beta-$$glycosidic bonds in cellulose.

Question 12

Which of the following is a correct description of a dehydration reaction?

Accepted Answer

It synthesizes polymers from monomers by removing water.

Question 13

A pharmacologist is designing a drug to treat Galactosemia. Which property of the drug is most important for it to interact with the enzyme responsible for galactose breakdown?

Accepted Answer

The drug must have a complementary shape to the enzyme's active site.

Question 14

Which of the following statements about steroids is correct?

Accepted Answer

Steroids have a structure of four fused carbon rings.

Question 15

Which of the following best describes the difference between starch and glycogen?

Accepted Answer

Glycogen is more highly branched than starch.

Question 16

Which of the following is a correct pairing of a chemical group and its function?

Accepted Answer

Carboxyl group: acts as an acid

Question 17

Which of the following is true about the quaternary structure of proteins?

Accepted Answer

It involves the assembly of multiple polypeptide subunits.

Question 18

Which of the following is a correct statement about the polarity of DNA strands?

Accepted Answer

The two strands run in opposite directions (antiparallel).

Question 19

Which of the following is a real-world consequence of a non-functional enzyme involved in carbohydrate metabolism?

Accepted Answer

Accumulation of undigested carbohydrates leading to organ damage

Question 20

Which of the following best explains why fats are efficient energy storage molecules?

Accepted Answer

They contain many nonpolar covalent bonds that store energy.

Macromolecules and Carbon Compounds in Biology: Structure, Function, and Diversity

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