Q: A solution has a pH of 3. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

$$[H^+] = 1 \times 10$$^{-3}$$ \text{M}$$

Question 1

Which property of water is most responsible for the ability of some insects to walk on its surface?

Accepted Answer

Surface tension due to hydrogen bonding

Question 2

A scientist is analyzing two samples of carbon. One sample contains atoms with 6 neutrons, and the other with 7 neutrons. What term best describes these two forms of carbon?

Accepted Answer

Isotopes

Question 3

Which of the following best explains why salt (NaCl) dissolves readily in water?

Accepted Answer

Water's polarity allows it to surround and separate Na+ and Cl- ions

Question 4

Which equation correctly represents the dissociation of water and the formation of acidic and basic solutions?

Accepted Answer

$$H_2O \rightarrow H^+ + OH^-$$

Question 5

Which of the following is a correct example of a condensation reaction in biological systems?

Accepted Answer

Joining two amino acids to form a dipeptide and releasing water

Question 6

A patient is diagnosed with a genetic disorder affecting the structure of their cell membranes, specifically the fluidity. Which molecule is most likely involved in this defect?

Accepted Answer

Cholesterol

Question 7

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids have one or more double bonds, causing kinks in the hydrocarbon chain

Question 8

Which of the following is NOT a function of proteins in biological systems?

Accepted Answer

Storing genetic information

Question 9

A mutation changes the primary structure of a protein. Which levels of protein structure could be affected as a result?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 10

Which of the following best describes the fluid mosaic model of the plasma membrane?

Accepted Answer

A dynamic structure with proteins and lipids able to move laterally within the bilayer

Question 11

Which process requires energy input from the cell and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 12

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

Accepted Answer

DNA is double-stranded, while RNA is usually single-stranded

Question 13

Which of the following best explains why glucose is classified as a monosaccharide?

Accepted Answer

It cannot be hydrolyzed into simpler sugars

Question 14

A solution has a pH of 3. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-3}$$ 	ext{M}$$

Question 15

Which of the following is a correct example of a glycosidic linkage?

Accepted Answer

The bond joining two glucose molecules in maltose

Question 16

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules through the membrane via carrier proteins, down their concentration gradient, without energy input

Question 17

Which of the following is true about the denaturation of proteins?

Accepted Answer

It disrupts secondary, tertiary, and quaternary structures but leaves the primary structure intact

Question 18

Which of the following is a real-world example of osmosis?

Accepted Answer

Absorption of water by plant roots from the soil

Question 19

Which of the following best describes the role of phospholipids in the plasma membrane?

Accepted Answer

They create a bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward

Question 20

Which of the following is a correct description of a nucleotide structure?

Accepted Answer

A nucleotide consists of a phosphate group, a pentose sugar, and a nitrogenous base

General Biology: Core Concepts and Molecular Foundations

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