Question 1

Which of the following best illustrates the concept of emergent properties in biological systems?

Accepted Answer

The selective permeability of a cell membrane resulting from the arrangement of phospholipids and proteins.

Question 2

A researcher is studying a population of frogs in a pond. Which level of biological organization is the researcher focusing on?

Accepted Answer

Population

Question 3

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of valence electrons between atoms.

Question 4

A molecule of water (H$$_2O) is $$held together by which type of bond, and what property does this confer to water?

Accepted Answer

Polar covalent bonds; ability to form hydrogen bonds

Question 5

Which property of water is primarily responsible for the ability of plants to transport water from their roots to their leaves against gravity?

Accepted Answer

Cohesion and adhesion due to hydrogen bonding

Question 6

If a solution has a pH of 4, what is the concentration of H$$^+$$ ions in the solution?

Accepted Answer

$$1 	imes 10$$^{-4}$$ M

Question 7

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds in ice keep water molecules farther apart, making ice less dense.

Question 8

A scientist adds hydrochloric acid (HCl) to water. What happens to the pH and why?

Accepted Answer

The pH decreases because HCl increases the H$$^+$$ concentration.

Question 9

Which functional group is found in amino acids and acts as a base by accepting H$$^+$$ ions?

Accepted Answer

Amino group ($$-NH_2$)

Question 10

Which of the following best describes the difference between structural isomers and enantiomers?

Accepted Answer

Structural isomers differ in covalent arrangement, while enantiomers are mirror images of each other.

Question 11

During dehydration synthesis, what is the result of joining two monomers?

Accepted Answer

A water molecule is released and a polymer is formed.

Question 12

Which class of biological molecules is primarily responsible for storing and transmitting genetic information?

Accepted Answer

Nucleic acids

Question 13

A molecule with the formula C$$_6H$_{12}O$_6 is $$most likely a:

Accepted Answer

Carbohydrate

Question 14

Which of the following best describes the role of the Stanley-Miller experiment in biology?

Accepted Answer

It showed that organic molecules could form spontaneously under early Earth conditions.

Question 15

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between oxygen and hydrogen in H$$_2O$$

Question 16

Which property of water allows it to dissolve many substances, making it an excellent solvent?

Accepted Answer

Its polarity and ability to form hydrogen bonds

Question 17

Which of the following best explains why oil does not mix with water?

Accepted Answer

Oil molecules are hydrophobic and do not form hydrogen bonds with water.

Question 18

A mutation changes the sequence of nucleotides in a gene. Which level of biological organization is directly affected by this change?

Accepted Answer

Molecule

Question 19

Which of the following best describes the relationship between structure and function in biological molecules?

Accepted Answer

The function of a molecule is determined by its structure, such as the shape of an enzyme's active site.

Question 20

Which of the following is a correct statement about gene expression?

Accepted Answer

Gene expression refers to the process by which cells use information encoded in a gene to synthesize a functional protein.

General Biology: Core Concepts, Chemistry of Life, and Biological Molecules

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