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 due to a non-functional enzyme. Which type of macromolecule is this enzyme?

Accepted Answer

Protein

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 target enzyme?

Accepted Answer

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

Question 6

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

Accepted Answer

$$3'-TAGCCAT-5'$$

Question 7

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

Accepted Answer

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

Question 8

Which of the following statements correctly contrasts DNA and RNA?

Accepted Answer

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

Question 9

Which type of chemical bond is most responsible for maintaining the tertiary structure of a protein?

Accepted Answer

Disulfide bridges and hydrophobic interactions among side chains

Question 10

A phospholipid molecule has both hydrophilic and hydrophobic regions. What is the term for this property, and why is it important for cell membranes?

Accepted Answer

Amphipathic; it allows phospholipids to form bilayers that separate aqueous environments

Question 11

Which process is responsible for breaking down polymers into monomers, such as during digestion?

Accepted Answer

Hydrolysis

Question 12

Which of the following best explains why hydrocarbons are a major energy source in fats?

Accepted Answer

Hydrocarbons have many nonpolar covalent bonds, which release energy when broken.

Question 13

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

Accepted Answer

Energy storage

Question 14

A mutation causes a change in the primary structure of a protein. Which of the following is most likely to occur?

Accepted Answer

The secondary, tertiary, and quaternary structures may also be altered, affecting protein function.

Question 15

Which of the following best describes the role of carbon skeleton variations in biological molecules?

Accepted Answer

They enable the diversity of organic molecules by varying length, branching, double bonds, and rings.

Question 16

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

Accepted Answer

It synthesizes polymers from monomers by removing a water molecule.

Question 17

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

Accepted Answer

Phosphate group ($$-PO_4$^{2-}$$): involved in energy transfer (e.g., ATP)

Question 18

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

Accepted Answer

A change in the enzyme's primary structure alters its shape and active site.

Question 19

Which of the following is a correct statement about the structure of nucleotides?

Accepted Answer

A nucleotide consists of a sugar, a phosphate group, and a nitrogenous base.

Question 20

Which of the following is a real-world application of understanding protein structure in medicine?

Accepted Answer

Designing drugs that bind to specific protein shapes to treat diseases

Carbon Compounds and Biological Macromolecules: Structure and Function

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