Question 1

Which of the following best describes the relationship between DNA, RNA, and proteins according to the Central Dogma of Molecular Biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into proteins.

Question 2

A population of beetles lives in a forest where birds prefer to eat light-colored beetles. Over several generations, the population becomes predominantly dark-colored. Which evolutionary concept does this scenario best illustrate?

Accepted Answer

Natural selection

Question 3

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells have a nucleus, whereas prokaryotic cells lack a nucleus.

Question 4

Which process is responsible for the production of genetic variation in prokaryotes through the uptake of naked DNA from the environment?

Accepted Answer

Transformation

Question 5

Which of the following best describes the main function of the electron transport chain in cellular respiration?

Accepted Answer

To transfer electrons and create a proton gradient for ATP synthesis

Question 6

A scientist discovers a new molecule that stores genetic information and is composed of deoxyribose, phosphate groups, and nitrogenous bases. Which type of biological macromolecule has the scientist most likely found?

Accepted Answer

DNA

Question 7

Which of the following is a correct comparison between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP, while oxidative phosphorylation uses a proton gradient to generate ATP.

Question 8

Which of the following best explains why phospholipids are essential components of cell membranes?

Accepted Answer

Their hydrophilic heads and hydrophobic tails allow them to form bilayers that create selective barriers.

Question 9

During which stage of eukaryotic cell division does the separation of sister chromatids occur?

Accepted Answer

Anaphase

Question 10

Which of the following is a correct statement about enzymes?

Accepted Answer

Enzymes lower the activation energy required for a reaction to occur.

Question 11

Which of the following best describes the process of meiosis?

Accepted Answer

It produces four genetically unique haploid cells.

Question 12

Which of the following is a function of ribosomes in the cell?

Accepted Answer

Translating mRNA into proteins

Question 13

A mutation causes a change in the amino acid sequence of a protein. Which molecule was most directly affected by this mutation?

Accepted Answer

DNA

Question 14

Which of the following is a correct statement about glycolysis?

Accepted Answer

Glycolysis occurs in the cytoplasm and does not require oxygen.

Question 15

Which of the following best describes the role of dehydration reactions in the formation of biological macromolecules?

Accepted Answer

They join monomers together by removing water.

Question 16

Which of the following is a real-life example of gene flow?

Accepted Answer

Wolves from one pack migrate and breed with wolves from another pack, introducing new alleles.

Question 17

Which of the following best explains why ATP is considered the energy currency of the cell?

Accepted Answer

ATP releases energy when its phosphate bonds are broken.

Question 18

Which of the following processes is responsible for the exchange of genetic material between homologous chromosomes during meiosis?

Accepted Answer

Crossing over

Question 19

Which of the following is a correct statement about the citric acid cycle?

Accepted Answer

It occurs in the mitochondrial matrix and generates NADH and FADH$$_2.$$

Question 20

Which of the following best describes the difference between autotrophic and heterotrophic organisms?

Accepted Answer

Autotrophs produce their own food from inorganic sources, while heterotrophs obtain energy by consuming other organisms.

Comprehensive Review Topics for General Biology

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