Question 1

Which of the following best describes an emergent property in biological systems?

Accepted Answer

A property that results from the arrangement and interaction of parts within a system, not present in the individual components alone.

Question 2

A controlled experiment is designed to test the effect of a single variable. Which of the following best describes the difference between the independent and dependent variables?

Accepted Answer

The independent variable is manipulated by the experimenter, while the dependent variable is measured as the outcome.

Question 3

Which of the following elements is considered a trace element essential for life?

Accepted Answer

Iron

Question 4

Given an atom with atomic number $$Z = 8$$ and mass number $$A = 16$$, how many neutrons does it have?

Accepted Answer

$$8$$ neutrons$$\ (A - Z = 16 - 8 = 8)$$

Question 5

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Question 6

Water has a high specific heat compared to other substances. Which property of water is primarily responsible for this?

Accepted Answer

Its ability to form hydrogen bonds between molecules

Question 7

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

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds keep water molecules farther apart in the solid state.

Question 8

A solution has a pH of $$4. $$Which of the following statements is true?

Accepted Answer

The solution is acidic and has a high concentration of $$\mathrm{H^+}$$ ions.

Question 9

Which functional group is found in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group $$(-\mathrm{COOH})$$

Question 10

Which of the following is a correct description of a dehydration synthesis reaction?

Accepted Answer

A reaction that joins monomers to form polymers by removing a water molecule.

Question 11

Which level of protein structure is characterized by alpha helices and beta pleated sheets?

Accepted Answer

Secondary structure

Question 12

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar while RNA contains ribose sugar.

Question 13

Which of the following is an example of a polysaccharide and its biological function?

Accepted Answer

Starch; long-term energy storage in plants

Question 14

Which bond is responsible for holding the two strands of DNA together?

Accepted Answer

Hydrogen bonds between complementary nitrogenous bases

Question 15

A biologist is studying the effect of temperature on enzyme activity. She keeps the pH and substrate concentration constant. What is the independent variable in her experiment?

Accepted Answer

Temperature

Question 16

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

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable organic molecules.

Question 17

Which of the following is a correct example of feedback regulation in biological systems?

Accepted Answer

A process where the end product inhibits the process that created it (negative feedback).

Question 18

Which property of water allows insects to walk on its surface?

Accepted Answer

Surface tension due to cohesion between water molecules

Question 19

Which of the following is true about saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids have one or more double bonds and are usually liquid at room temperature.

Question 20

A scientist observes that when she adds hydrochloric acid ($$\mathrm{HCl}) to $$water, the pH drops from $$7 to$$ $$2. $$What is the change in $$\mathrm{H^+}$$ ion concentration?

Accepted Answer

It increases by $$10^5$$ times.

General Biology: Foundations, Chemistry, Water, Carbon, and Macromolecules

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