Question 1

Which of the following best explains why water is an effective solvent for many biological molecules?

Accepted Answer

Water’s polarity allows it to form hydrogen bonds with charged and polar molecules.

Question 2

A patient is diagnosed with anemia due to iron deficiency. Which category of elements does iron belong to, and why is it essential?

Accepted Answer

Iron is a trace element required in small amounts for vital functions like oxygen transport.

Question 3

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells contain a nucleus and membrane-bound organelles; prokaryotic cells lack both.

Question 4

A cell is placed in a solution and swells until it bursts. Which process and type of solution are responsible for this outcome?

Accepted Answer

Osmosis in a hypotonic solution

Question 5

Which statement about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy and are most effective at specific pH and temperature.

Question 6

During aerobic cellular respiration, what is the correct sequence of major metabolic pathways, and where do they occur?

Accepted Answer

Glycolysis (cytoplasm) → Citric Acid Cycle (mitochondria) → Oxidative Phosphorylation (mitochondria)

Question 7

A plant is exposed to light, but its chloroplasts are damaged. Which process will be directly affected, and what is the main consequence?

Accepted Answer

Photosynthesis will be impaired, reducing glucose production.

Question 8

Which of the following best explains why steroid hormones can enter cells while peptide hormones cannot?

Accepted Answer

Steroid hormones are nonpolar and can diffuse through the lipid bilayer; peptide hormones are polar and bind to surface receptors.

Question 9

A scientist observes a cell undergoing mitosis but notices that the cytoplasm does not divide. What is the result of this process?

Accepted Answer

One cell with two nuclei (binucleate cell)

Question 10

Which event during meiosis increases genetic diversity by exchanging genetic material between homologous chromosomes?

Accepted Answer

Crossing over

Question 11

A woman with genotype $Aa$ for a gene marries a man with genotype $aa$. What is the probability that their child will be homozygous recessive?

Accepted Answer

$50\%$

Question 12

Which of the following best describes the structure of DNA?

Accepted Answer

A double helix of nucleotides with A–T and G–C base pairs held by hydrogen bonds

Question 13

Which enzyme is responsible for joining Okazaki fragments during DNA replication?

Accepted Answer

DNA ligase

Question 14

A cell is actively transporting sodium ions ($Na^+$) out of the cell against their concentration gradient. Which molecule provides the energy for this process?

Accepted Answer

ATP

Question 15

Which of the following scenarios best illustrates the complementary relationship between photosynthesis and cellular respiration?

Accepted Answer

Plants convert carbon dioxide and water into glucose and oxygen, which animals use for respiration to release energy, carbon dioxide, and water.

Question 16

A mutation causes a cell to lose control over its cell cycle checkpoints. What is the most likely consequence?

Accepted Answer

The cell will divide uncontrollably, potentially leading to cancer.

Question 17

Which of the following best describes the role of the mitochondria in eukaryotic cells?

Accepted Answer

Producing ATP through cellular respiration

Question 18

A researcher is studying a protein with a mutation that disrupts its tertiary structure but not its primary structure. Which level(s) of protein structure are most likely affected?

Accepted Answer

Tertiary and possibly quaternary structure

Question 19

Which process is responsible for moving large particles into a cell, such as a white blood cell engulfing a bacterium?

Accepted Answer

Endocytosis

Question 20

A geneticist is mapping two genes and finds a recombination frequency of $10\%$. What does this indicate about the genes’ locations?

Accepted Answer

The genes are linked and located close together on the same chromosome.

General Biology: Core Concepts and Processes

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