Question 1

Which of the following statements best explains why biology is considered a complex form of chemistry?

Accepted Answer

Biology is based on chemical principles, but also involves emergent properties and complex interactions not found in simple chemistry.

Question 2

Which four elements make up approximately 96% of living matter?

Accepted Answer

Carbon, hydrogen, oxygen, and nitrogen

Question 3

A patient is diagnosed with a goiter due to a deficiency in a trace element. Which element is most likely deficient?

Accepted Answer

Iodine

Question 4

Which of the following best describes an isotope?

Accepted Answer

An atom with a different number of neutrons than other atoms of the same element

Question 5

Radioactive isotopes are useful in biological research for which of the following applications?

Accepted Answer

Dating fossils and diagnosing medical disorders

Question 6

Which equation correctly represents the photosynthesis reaction?

Accepted Answer

$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2$$

Question 7

What is the atomic number of an element, and how is it determined?

Accepted Answer

The number of protons in the nucleus

Question 8

Which type of chemical bond involves the sharing of a pair of valence electrons between two atoms?

Accepted Answer

Covalent bond

Question 9

What is the main difference between a polar covalent bond and a nonpolar covalent bond?

Accepted Answer

Polar covalent bonds have unequal sharing of electrons due to differences in electronegativity, while nonpolar covalent bonds have equal sharing.

Question 10

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the attraction between oppositely charged ions

Question 11

A sodium atom ($$\mathrm{Na}) $$transfers an electron to a chlorine atom ($$\mathrm{Cl}$$), forming sodium chloride ($$\mathrm{NaCl}). $$What type of ions are produced?

Accepted Answer

Sodium becomes a cation and chlorine becomes an anion

Question 12

Which of the following is a property of hydrogen bonds in biological systems?

Accepted Answer

They are individually weak but collectively can be strong, such as in DNA or water.

Question 13

Which statement best describes the concept of emergent properties in compounds?

Accepted Answer

Compounds have properties different from those of their constituent elements.

Question 14

Which of the following best explains why elements like carbon, hydrogen, oxygen, and nitrogen are more abundant in living organisms than in Earth's crust?

Accepted Answer

They are more chemically reactive and form the basis of organic molecules.

Question 15

Which of the following is true about van der Waals interactions?

Accepted Answer

They are weak interactions that can be collectively strong, such as in gecko feet adhesion.

Question 16

Which of the following best describes the role of molecular shape in biological function?

Accepted Answer

Molecules recognize and interact with each other based on their specific shapes.

Question 17

Which of the following is a correct statement about chemical reactions?

Accepted Answer

Products are the final molecules produced by a chemical reaction.

Question 18

Which of the following best explains why elements with a full valence shell are chemically inert?

Accepted Answer

They do not need to gain, lose, or share electrons to achieve stability.

Question 19

A molecule of water ($$\mathrm{H}_2\mathrm{O}) is $$held together by which type of bond, and what type of bond forms between water molecules?

Accepted Answer

Covalent bonds within the molecule; hydrogen bonds between molecules

Question 20

Which scenario best illustrates the concept of electronegativity in a biological context?

Accepted Answer

Oxygen in water pulls shared electrons closer, resulting in partial charges and hydrogen bonding.

Chapter 2: The Chemistry of Life – Foundations for General Biology

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