Question 1

Why is it important to begin a biology course by discussing molecules and atoms?

Accepted Answer

Because all biological processes are ultimately governed by the interactions of molecules and atoms.

Question 2

Which property of water allows it to act as a buffer in living organisms?

Accepted Answer

Water is both a weak acid and a weak base.

Question 3

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Question 4

Amino acids are grouped based on the properties of their side chains. Which group would you expect to interact most strongly with water?

Accepted Answer

Polar, hydrophilic side chains

Question 5

Which of the following best describes the role of functional groups in biomolecules?

Accepted Answer

Functional groups define the chemical behavior of biomolecules.

Question 6

Which equation correctly represents the dissociation of water, showing its role as both a weak acid and a weak base?

Accepted Answer

$$2H_2O \rightarrow H_3O^+ + OH^-$$

Question 7

Which of the following is a real-world example of a protein's function in the human body?

Accepted Answer

Hemoglobin transports oxygen in the blood.

Question 8

Which statement about nucleic acids is correct?

Accepted Answer

Nucleic acids store and transmit genetic information.

Question 9

Which of the following is a carbohydrate and its primary biological function?

Accepted Answer

Starch; energy storage in plants

Question 10

A patient is experiencing acidosis (low blood pH). Which property of water helps maintain their blood pH within a normal range?

Accepted Answer

Water acts as a buffer by accepting or donating protons.

Question 11

Which of the following best explains why proteins can have such diverse functions in living organisms?

Accepted Answer

Proteins are made from 20 different amino acids with varying side chains, allowing for a wide range of structures and functions.

Question 12

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

Accepted Answer

Catalyzing chemical reactions

Question 13

Which of the following scenarios best illustrates the importance of molecular interactions in biology?

Accepted Answer

Enzyme-substrate binding in metabolic reactions

Question 14

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA is a polymer made of nucleotide monomers joined by phosphodiester bonds.

Question 15

Which equation represents the formation of a peptide bond between two amino acids?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + H_2O$$

Question 16

A mutation changes a polar amino acid in a protein to a nonpolar one. What is the most likely effect on the protein's structure?

Accepted Answer

The protein may fold differently due to altered interactions with water.

Question 17

Which of the following is a correct statement about the relationship between atoms, molecules, and cells?

Accepted Answer

Atoms combine to form molecules, which make up the structures and functions of cells.

Question 18

Which of the following best describes the role of hydrogen bonds in biological molecules?

Accepted Answer

Hydrogen bonds stabilize the structure of proteins and nucleic acids.

Question 19

Which of the following is a multi-step process involving both carbohydrates and proteins in a living cell?

Accepted Answer

Glycoprotein synthesis, where carbohydrates are attached to proteins for cell recognition.

General Biology Study Notes: Life Chemistry & Biomolecules

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