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

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

Question 1

Which of the following best describes the relationship between atoms, molecules, and macromolecules in biological systems?

Accepted Answer

Atoms combine to form molecules, which can assemble into macromolecules.

Question 2

Which of the following is a correct representation of the levels of organization in living systems, from smallest to largest?

Accepted Answer

Atom $$\rightarrow$$ Molecule $$\rightarrow$$ Cell $$\rightarrow$$ Organism $$\rightarrow$$ Biosphere

Question 3

A scientist is testing the effect of different concentrations of salt on plant growth. Which is the independent variable in this experiment?

Accepted Answer

The concentration of salt in the soil

Question 4

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Water has an uneven distribution of electrons, resulting in partial positive and negative charges.

Question 5

Which equation correctly represents the formation of a peptide bond between two amino acids?

Accepted Answer

$$\mathrm{Amino\ Acid}_1 + \mathrm{Amino\ Acid}_2 \rightarrow \mathrm{Dipeptide} + H_2O$$

Question 6

Which property of water allows it to moderate Earth's climate by absorbing and releasing heat slowly?

Accepted Answer

High specific heat

Question 7

A triglyceride is formed by the condensation of which molecules?

Accepted Answer

Three fatty acids and one glycerol

Question 8

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

Accepted Answer

Unsaturated fatty acids contain one or more double bonds, causing kinks in the chain.

Question 9

Which of the following is a function of enzymes in biological systems?

Accepted Answer

Enzymes speed up chemical reactions by lowering the activation energy.

Question 10

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}$$ M

Question 11

Which of the following statements about buffer systems in biological fluids is correct?

Accepted Answer

Buffers minimize changes in pH by accepting or donating hydrogen ions.

Question 12

Which macromolecule is primarily responsible for storing genetic information in cells?

Accepted Answer

Nucleic acids

Question 13

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 14

Which of the following is a correct example of a hydrolysis reaction?

Accepted Answer

$$\mathrm{Maltose} + H_2O \rightarrow \mathrm{Glucose} + \mathrm{Glucose}$$

Question 15

Which functional group is characteristic of alcohols?

Accepted Answer

Hydroxyl group $$(-OH)$$

Question 16

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, causing them to arrange in bilayers.

Question 17

Which of the following is a correct statement about the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells do not.

Question 18

Which of the following best describes the role of ATP in cellular processes?

Accepted Answer

ATP provides energy for cellular reactions by releasing a phosphate group.

Question 19

A student observes that the average distance between slugs in a plot increases during the day and decreases at night. Which hypothesis best explains this pattern?

Accepted Answer

Slugs are more active at night and cluster together to conserve moisture.

General Biology: Foundations, Chemistry, Macromolecules, and Experimental Design

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