Question 1

Which property of carbon allows it to form a wide variety of complex organic molecules essential for life?

Accepted Answer

It has four valence electrons, enabling it to form up to four covalent bonds with different atoms.

Question 2

A hydrocarbon is best described as:

Accepted Answer

A molecule containing only carbon and hydrogen.

Question 3

Which of the following functional groups is responsible for the acidic properties of amino acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 4

During the formation of a disaccharide from two monosaccharides, which type of reaction occurs and what is the byproduct?

Accepted Answer

Dehydration synthesis; water is released

Question 5

Which of the following statements about cellulose and starch is correct?

Accepted Answer

Both are composed of glucose monomers, but humans can digest only starch.

Question 6

A patient is diagnosed with a genetic disorder that affects the folding of proteins in their cells. Which level of protein structure is most directly affected by this disorder?

Accepted Answer

Tertiary structure

Question 7

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, causing them to arrange with heads facing water and tails inward.

Question 8

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

Accepted Answer

Storing genetic information

Question 9

A triglyceride is formed by joining three fatty acids to a glycerol molecule. What type of bond is formed between the glycerol and fatty acids?

Accepted Answer

Ester linkage

Question 10

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

Accepted Answer

Saturated fatty acids have no double bonds and are typically solid at room temperature.

Question 11

Which of the following statements about ATP is correct?

Accepted Answer

ATP is a nucleoside triphosphate that provides energy for cellular processes.

Question 12

A scientist is studying a molecule with the formula $$C_{6}H$$_{12}$$O_{6}$. Which class of macromolecule does this molecule most likely belong to?

Accepted Answer

Carbohydrate

Question 13

Which of the following best explains why humans cannot digest cellulose?

Accepted Answer

Humans lack the enzyme to break the $$\beta-1$$,4 glycosidic bonds in cellulose.

Question 14

Which of the following is a correct pairing of a functional group and its characteristic property?

Accepted Answer

Amino group: acts as a base

Question 15

A mutation changes a single amino acid in the primary structure of a protein. Which of the following could be a possible consequence?

Accepted Answer

Altered secondary, tertiary, or quaternary structure, potentially leading to loss of function

Question 16

Which of the following best describes the process of hydrolysis in biological systems?

Accepted Answer

It breaks down polymers into monomers by adding a water molecule.

Question 17

Which macromolecule is primarily responsible for storing and transmitting hereditary information?

Accepted Answer

Nucleic acids

Question 18

A researcher isolates a molecule with a long hydrocarbon chain and a carboxyl group at one end. This molecule is most likely:

Accepted Answer

A fatty acid

Question 19

Which of the following best explains the role of chitin in living organisms?

Accepted Answer

It provides structural support in fungal cell walls and arthropod exoskeletons.

Question 20

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Carbon and the Molecular Diversity of Life: Study Notes for General Biology

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