Question 1

Which of the following best explains why carbon is uniquely suited to form the backbone of biological macromolecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a variety of stable, complex, and diverse molecular structures.

Question 2

A molecule contains a hydroxyl group and a carboxyl group. Which functional groups are present, and what are their general chemical properties?

Accepted Answer

Hydroxyl (alcohol) group, which is polar and increases solubility in water; Carboxyl group, which is acidic and can donate a proton.

Question 3

Which of the following best describes the difference between homeostasis and equilibrium in biological systems?

Accepted Answer

Homeostasis requires energy expenditure to maintain a stable internal environment, while equilibrium is a state of lowest free energy with no net energy input.

Question 4

Which of the following functional groups is most likely to be found in the side chain of cysteine, and what is its significance?

Accepted Answer

Thiol (sulfhydryl) group, which can form disulfide bonds important for protein structure.

Question 5

A researcher is analyzing two proteins using BLAST and finds that their sequences are 95% identical. What can be inferred about their evolutionary relationship?

Accepted Answer

The proteins likely share a recent common ancestor and are closely related.

Question 6

Which of the following is an example of self-assembly in biological systems?

Accepted Answer

Formation of a lipid bilayer from phospholipids in water.

Question 7

Which of the following best illustrates the concept of emergent complexity in biology?

Accepted Answer

The folding of amino acids into a functional protein with catalytic activity.

Question 8

Which of the following is NOT one of the seven distinguishing characteristics of living systems?

Accepted Answer

Equilibrium

Question 9

Which of the following best describes a biopolymer?

Accepted Answer

A large biological macromolecule made of repeating monomer units, such as proteins, nucleic acids, or carbohydrates.

Question 10

Which of the following functional groups is most likely to increase the water solubility of a molecule?

Accepted Answer

Hydroxyl group $$\left( -OH \right)$$

Question 11

Which of the following best describes the process of autopoiesis?

Accepted Answer

The ability of a system to self-renew and maintain itself.

Question 12

A molecule with the following structure is found: $$CH_3$$-$$CH_2$$-$$NH_2. $$Which functional group does it contain?

Accepted Answer

Amine

Question 13

Which of the following is a correct sequence of events in a negative feedback loop maintaining homeostasis?

Accepted Answer

Sensing a deviation from balance, activating a response to correct it, sensing an overshoot, slowing the response.

Question 14

Which of the following statements about condensation reactions in biopolymer synthesis is correct?

Accepted Answer

A bond is formed between monomers with the removal of a water molecule.

Question 15

Which of the following molecules is most likely to be water-insoluble based on its structure?

Accepted Answer

A long hydrocarbon chain with only methyl groups.

Question 16

Which of the following best describes genetic continuity?

Accepted Answer

The transmission of genetic information from one generation to the next, allowing evolutionary relationships to be traced.

Question 17

Which of the following functional groups is present in both aldehydes and ketones?

Accepted Answer

Carbonyl group $$\left( \u003eC=O \right)$$

Question 18

A molecule contains a phosphate group. Which of the following is a likely property of this molecule?

Accepted Answer

It is highly polar and likely to be water-soluble.

Question 19

Which of the following is an example of compartmentalization in cells?

Accepted Answer

The presence of membrane-bound organelles such as mitochondria.

Question 20

Which of the following best explains why proteins can be used to trace evolutionary relationships?

Accepted Answer

Protein sequences are encoded by genes and are inherited, so similarities reflect common ancestry.

Chapter 1: Biochemistry and the Language of Chemistry – Study Notes

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