Q: Which of the following is the correct formula for calculating the number of neutrons in an atom?

$$\text{Number of neutrons} = \text{mass number} - \text{atomic number}$$

Question 1

Which of the following best describes the difference between a controlled experiment and a comparative experiment in biology?

Accepted Answer

A controlled experiment compares an experimental group to a control group with only one variable changed, while a comparative experiment compares groups that differ in several variables.

Question 2

Which statement about deductive reasoning is correct?

Accepted Answer

Deductive reasoning uses general premises to make specific predictions.

Question 3

A hydrogen bond is formed when:

Accepted Answer

A hydrogen atom covalently bonded to one electronegative atom is attracted to another electronegative atom.

Question 4

Which of the following is true about polar covalent bonds?

Accepted Answer

Electrons are shared unequally, resulting in partial charges on the atoms.

Question 5

What is the mass number of an atom with 12 protons and 13 neutrons?

Accepted Answer

$$25$$

Question 6

Which of the following best explains why water molecules are polar?

Accepted Answer

Oxygen is more electronegative than hydrogen, causing an unequal sharing of electrons.

Question 7

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

Accepted Answer

Cohesion due to hydrogen bonding

Question 8

If an atom has an atomic number of $$8$$ and a mass number of $$18$$, how many neutrons does it have?

Accepted Answer

$$10$$

Question 9

Which statement about acids and bases is correct?

Accepted Answer

Acids increase the concentration of hydrogen ions, while bases decrease it.

Question 10

Which of the following is a trace element required by organisms in minute quantities?

Accepted Answer

Iron

Question 11

Which of the following best describes the concept of reductionism in biology?

Accepted Answer

The reduction of complex systems into simpler components that are more manageable to study.

Question 12

Which of the following is NOT a characteristic of eukaryotic cells?

Accepted Answer

Lack membrane-bound organelles

Question 13

Which of the following best describes the hierarchy of biological organization from largest to smallest?

Accepted Answer

Organism \u003e Organ system \u003e Organ \u003e Tissue \u003e Cell \u003e Molecule \u003e Atom

Question 14

Which of the following is the correct formula for calculating the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{mass number} - 	ext{atomic number}$$

Question 15

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 16

Which of the following best explains why water has a high specific heat?

Accepted Answer

Water molecules form strong hydrogen bonds that require more energy to break.

Question 17

Which of the following is an example of adhesion?

Accepted Answer

Water molecules sticking to the walls of plant cells

Question 18

Which of the following best describes the relationship between temperature and kinetic energy?

Accepted Answer

Temperature represents the average kinetic energy of molecules in a body of matter.

Question 19

A solution has a pH of $$5. $$Which of the following statements is correct?

Accepted Answer

The solution is acidic.

Question 20

Which of the following is the best example of a covalent bond?

Accepted Answer

The sharing of electrons between two oxygen atoms in an $$O_2$$ molecule

General Biology: Foundations, Chemistry of Life, and Water

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