Question 1

Which chemical group is responsible for the acidic properties of amino acids and is commonly found in organic acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

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 describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids have one or more double bonds, causing kinks in their structure.

Question 4

Which level of protein structure is primarily stabilized by hydrogen bonds between backbone atoms, resulting in alpha helices and beta sheets?

Accepted Answer

Secondary structure

Question 5

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

Accepted Answer

The drug's ability to form hydrogen bonds with the enzyme's active site

Question 6

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids have a hydrophilic head and two hydrophobic tails.

Question 7

Which of the following best explains why carbon is able to form such a wide variety of molecules in living organisms?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for chains, rings, and branching structures.

Question 8

Which of the following is a correct complementary DNA sequence for the strand $$5'-ATCGGTA-3'$$?

Accepted Answer

$$3'-TAGCCAT-5'$$

Question 9

Which chemical group is found in both nucleic acids and phospholipids, and is essential for energy transfer in cells?

Accepted Answer

Phosphate group ($$-PO_4$^{2-})$$

Question 10

Which of the following is a correct description of the difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 11

Which type of chemical bond is primarily responsible for maintaining the primary structure of a protein?

Accepted Answer

Peptide (covalent) bonds

Question 12

A triglyceride is formed by joining three fatty acids to a glycerol molecule. What type of reaction is responsible for this synthesis?

Accepted Answer

Dehydration synthesis

Question 13

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

Accepted Answer

They create kinks in the fatty acid chain, preventing tight packing and making the fat liquid at room temperature.

Question 14

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 15

Which of the following best explains why enzymes may become non-functional in individuals with Galactosemia?

Accepted Answer

The enzyme's primary structure is altered due to a genetic mutation, affecting its ability to catalyze reactions.

Question 16

Which of the following is a correct example of a carbohydrate polymer and its function?

Accepted Answer

Starch; energy storage in plants

Question 17

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

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogenous base

Question 18

Which of the following bonds is most influential in maintaining the tertiary structure of a protein?

Accepted Answer

Hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges

Question 19

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

Accepted Answer

The two strands run in opposite directions: one 5' to 3', the other 3' to 5'.

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

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