Question 1

Which of the following statements best explains why carbon is the backbone of most organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a variety of stable structures such as chains, branches, and rings.

Question 2

Which functional group is hydrophobic and primarily contributes to the structural properties of organic molecules?

Accepted Answer

Methyl group

Question 3

A patient is diagnosed with atherosclerosis due to high cholesterol levels. Which type of biomolecule is directly involved in this condition, and what is its structural characteristic?

Accepted Answer

Steroid; characterized by a ringed carbon skeleton

Question 4

Which process is responsible for breaking down a polysaccharide into its monosaccharide units, and what molecule is required for this reaction?

Accepted Answer

Hydrolysis; water ($$\mathrm{H_2O})$$

Question 5

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 6

A scientist is studying a molecule with the formula $$\mathrm{C_4H_{10}}. $$She finds that it can exist as both butane and isobutane. What property of these molecules allows this?

Accepted Answer

They are isomers, having the same molecular formula but different structural arrangements.

Question 7

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, allowing them to form bilayers that separate the cell from its environment.

Question 8

Which of the following is a correct pairing of a nucleotide base in DNA and its complementary base?

Accepted Answer

Adenine ($$A) $$pairs with Thymine ($$T)$$

Question 9

A protein loses its three-dimensional structure after being exposed to high heat. Which term best describes this process, and what is the consequence for the protein's function?

Accepted Answer

Denaturation; the protein loses its biological activity

Question 10

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

Accepted Answer

A linear sequence of amino acids linked by peptide bonds

Question 11

Which of the following is a real-life consequence of consuming large amounts of trans fats?

Accepted Answer

Increased risk of cardiovascular diseases due to plaque buildup in arteries

Question 12

Which of the following best explains why enzymes are considered biological catalysts?

Accepted Answer

They speed up chemical reactions without being consumed in the process

Question 13

A dehydration reaction between two glucose molecules results in the formation of which disaccharide and what byproduct?

Accepted Answer

Maltose and water ($$\mathrm{H_2O})$$

Question 14

Which of the following statements about nucleic acids is correct?

Accepted Answer

DNA and RNA are polymers made from nucleotide monomers joined by dehydration reactions

Question 15

Which of the following best describes the role of the R group in an amino acid?

Accepted Answer

It determines the chemical properties and classification (hydrophilic or hydrophobic) of the amino acid

Question 16

A researcher is analyzing a sample and finds it contains a large amount of chitin. Which type of biomolecule is chitin, and where is it commonly found?

Accepted Answer

Polysaccharide; found in the exoskeletons of arthropods

Question 17

Which of the following best explains why anabolic steroids are banned in sports?

Accepted Answer

They mimic testosterone, enhancing muscle mass and performance, but cause harmful side effects

Question 18

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

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water ($$\mathrm{H_2O})$$

Question 19

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

Accepted Answer

The arrangement of multiple polypeptide chains into a functional protein

Question 20

Which of the following statements about aromatic hydrocarbons is correct?

Accepted Answer

They have a ringed carbon skeleton and often emit a unique aroma

The Molecules of Cells: Structure and Function of Biomolecules

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