Question 1

Which of the following best explains why viruses are generally not considered living organisms?

Accepted Answer

They cannot independently reproduce without a host cell.

Question 2

A scientist is studying the effect of temperature on the rate of enzyme activity in bacteria. Which is the dependent variable in this experiment?

Accepted Answer

The rate of enzyme activity

Question 3

Which of the following correctly lists the biological levels of organization from smallest to largest?

Accepted Answer

Atom → Molecule → Organelle → Cell → Tissue

Question 4

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

Accepted Answer

Nucleic acids

Question 5

A student mixes a solution of glucose ($$C_6H_{12}O_6$) and fructose (C_6H$$_{12}$$O_6) $$and observes the formation of sucrose ($$C_{12}H$$_{22}$$O_{11}$) and water. Which type of reaction has occurred?

Accepted Answer

Dehydration synthesis

Question 6

Which of the following statements about proteins is TRUE?

Accepted Answer

Proteins are made of amino acids joined by peptide bonds.

Question 7

Which of the following is a function of lipids in living organisms?

Accepted Answer

Forming cell membranes

Question 8

A patient is unable to sweat and cannot cool down their body temperature during exercise. Which characteristic of life is most directly affected?

Accepted Answer

Homeostasis

Question 9

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Polymers are long chains made by joining monomers together.

Question 10

Which of the following is an example of a polysaccharide and its biological function?

Accepted Answer

Cellulose; provides structural support in plant cell walls

Question 11

A researcher is studying a molecule with a phosphate group, a pentose sugar, and a nitrogenous base. This molecule is most likely a:

Accepted Answer

Nucleotide

Question 12

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

Accepted Answer

They are amphipathic, having both hydrophilic heads and hydrophobic tails.

Question 13

During digestion, the breakdown of starch into glucose monomers is an example of which process?

Accepted Answer

Hydrolysis

Question 14

Which of the following scenarios best illustrates the concept of evolution as a characteristic of life?

Accepted Answer

A population of bacteria develops resistance to an antibiotic over several generations.

Question 15

Which of the following correctly matches a macromolecule with its monomer and the type of bond that links them?

Accepted Answer

Protein; amino acid; peptide bond

Question 16

A mutation causes a protein to lose its specific three-dimensional shape. What is the most likely consequence?

Accepted Answer

The protein will become nonfunctional due to denaturation.

Question 17

Which of the following is a correct difference between DNA and RNA?

Accepted Answer

DNA contains thymine, while RNA contains uracil.

Question 18

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

They speed up chemical reactions by lowering activation energy.

Question 19

A biologist observes that a certain molecule is insoluble in water and is used for long-term energy storage in animals. This molecule is most likely a:

Accepted Answer

Lipid

Question 20

Which of the following best illustrates the concept of organization as a characteristic of life?

Accepted Answer

A cell contains organelles that perform specialized functions.

Characteristics of Life, Biological Organization, Experimental Variables, and Macromolecules

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