Question 1

Which of the following best explains why carbon is considered the backbone of life?

Accepted Answer

Carbon atoms can form up to four covalent bonds, allowing for complex and diverse molecular structures.

Question 2

A scientist is studying a molecule with the formula $C_{6}H_{12}O_{6}$. Which class of macromolecule does this molecule most likely belong to?

Accepted Answer

Monosaccharide

Question 3

Which property of water is most critical for its role as the 'molecule that supports all life'?

Accepted Answer

Its high specific heat capacity, which helps regulate temperature in organisms and environments

Question 4

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

Accepted Answer

Eukaryotic cells have a nucleus containing DNA, while prokaryotic cells have DNA in a nucleoid region.

Question 5

A cell is placed in a solution and water moves into the cell, causing it to swell. What type of solution is the cell in?

Accepted Answer

Hypotonic

Question 6

Which equation correctly represents the relationship between surface area ($SA$) and volume ($V$) for a spherical cell?

Accepted Answer

$SA = 4\pi r^2$ and $V = \frac{4}{3}\pi r^3$

Question 7

Which of the following is NOT a function of the plasma membrane in cells?

Accepted Answer

Synthesizing proteins for the cell

Question 8

Which organelle is primarily responsible for energy production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 9

A mutation causes a cell to lack microtubules. Which cellular process would be most directly affected?

Accepted Answer

Cell division (mitosis and meiosis)

Question 10

Which of the following best explains why cells are limited in size by their surface area to volume ratio?

Accepted Answer

As cells grow larger, their volume increases faster than their surface area, limiting efficient exchange of materials.

Question 11

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It uses membrane proteins to move substances down their concentration gradient.

Question 12

Which macromolecule is most directly involved in catalyzing chemical reactions in living organisms?

Accepted Answer

Proteins (enzymes)

Question 13

Which of the following is a correct statement about the fluid mosaic model of the plasma membrane?

Accepted Answer

Phospholipids and proteins can move laterally within the layer, giving the membrane flexibility.

Question 14

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers maintain a stable pH by neutralizing excess acids or bases.

Question 15

Which process is responsible for the uptake of large particles, such as bacteria, by eukaryotic cells?

Accepted Answer

Endocytosis (specifically phagocytosis)

Question 16

Which of the following is a property of water that contributes to Earth's suitability for life?

Accepted Answer

Water is less dense as a solid than as a liquid, allowing ice to float.

Question 17

Which of the following is a correct description of the function of ribosomes?

Accepted Answer

Ribosomes are involved in protein synthesis by translating mRNA.

Question 18

A patient is diagnosed with acidosis, meaning their blood pH is below normal. Which equation best represents the role of bicarbonate as a buffer in the blood?

Accepted Answer

$CO_2 + H_2O \leftrightarrow H_2CO_3 \leftrightarrow HCO_3^- + H^+$

Question 19

Which of the following is a correct statement about the endosymbiotic theory?

Accepted Answer

It proposes that mitochondria and chloroplasts originated from free-living prokaryotes engulfed by ancestral eukaryotic cells.

Question 20

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Providing structural support and facilitating movement of organelles

General Biology: Core Concepts and Cell Structure Study Guide

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