Question 1

Which of the following statements correctly describes the arrangement of subatomic particles in a neutral atom of carbon-14 ($$^{14}\mathrm{C}$$)?

Accepted Answer

Protons and neutrons are located in the nucleus, while electrons orbit the nucleus in defined shells.

Question 2

If the hydrogen ion concentration $$[H^+] of a $$solution is $$1 	imes 10$$^{-5}$$ M, what is the pH of the solution?

Accepted Answer

$$5$$

Question 3

Which functional group is present in all amino acids and can act as a base by accepting a hydrogen ion?

Accepted Answer

Amino group ($$-NH_2$)

Question 4

Which of the following correctly matches a biological macromolecule with its monomer?

Accepted Answer

Protein – Amino acid

Question 5

A cell is placed in a solution with a higher solute concentration than its cytoplasm. What will happen to the cell?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 6

Which organelle is primarily responsible for the production of ATP in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 7

A chemical reaction has a negative $$\Delta G$$ value. Which of the following is true about this reaction?

Accepted Answer

The reaction is exergonic and releases energy.

Question 8

During glycolysis, what are the net products generated from one molecule of glucose?

Accepted Answer

2 ATP, 2 NADH, and 2 pyruvate

Question 9

Where do the light-dependent reactions of photosynthesis occur in plant cells?

Accepted Answer

Thylakoid membranes of the chloroplast

Question 10

A human cell in G2 phase has 46 chromosomes and 92 chromatids. After meiosis II, how many chromosomes and chromatids will each gamete have?

Accepted Answer

23 chromosomes and 23 chromatids

Question 11

In a monohybrid cross between two heterozygous pea plants ($$Tt 	imes Tt$$), what is the expected phenotypic ratio of tall to short offspring if tall is dominant?

Accepted Answer

3:1

Question 12

Which of the following best describes the structure of DNA?

Accepted Answer

A double helix with antiparallel sugar-phosphate backbones

Question 13

Given the DNA template strand $$3'	ext{-}TACGGTACG-5'$$, what is the corresponding mRNA sequence produced during transcription?

Accepted Answer

$$5'	ext{-}AUGCCAUGC-3'$$

Question 14

Which component of the translation machinery is responsible for bringing amino acids to the ribosome?

Accepted Answer

tRNA

Question 15

A patient is given an intravenous solution that is hypotonic relative to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will swell and may burst due to water influx.

Question 16

Which of the following best describes the difference between a gene and an allele?

Accepted Answer

A gene is a segment of DNA that codes for a trait, while an allele is a variant form of that gene.

Question 17

Which of the following is a correct statement about the endoplasmic reticulum (ER)?

Accepted Answer

The rough ER is studded with ribosomes and is involved in protein synthesis.

Question 18

A woman who is a carrier for color blindness (an X-linked recessive trait) and a man with normal vision have a son. What is the probability that their son will be color blind?

Accepted Answer

$$50\%$$

Question 19

Which of the following best explains why lipids are not considered true polymers?

Accepted Answer

Lipids are not made of repeating monomer units.

Question 20

If a reaction has an activation energy of $$50\ \mathrm{kJ/mol}$$ and an enzyme lowers it to $$20\ \mathrm{kJ/mol}$$, what is the effect on the overall $$\Delta G of $$the reaction?

Accepted Answer

The $$\Delta G$$ remains unchanged.

Comprehensive Study Guide: Key Concepts in Introductory Biology (Chapters 2–17)

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