Q: Which equation correctly represents the calculation of the number of neutrons in an atom?

$$\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}$$

Q: Which equation is used to calculate pH from the concentration of hydrogen ions?

$$\text{pH} = -\log_{10} [\text{H}^+]$$

Question 1

Which of the following best describes the difference between a theory and a hypothesis in scientific research?

Accepted Answer

A hypothesis is a prediction that can be tested, while a theory is a comprehensive explanation supported by evidence.

Question 2

Which of the following is NOT a step in the scientific method?

Accepted Answer

Accepting results without analysis

Question 3

A scientist wants to test the effect of sunlight on plant growth. She sets up two groups: one receives sunlight, the other does not. What is the independent variable in this experiment?

Accepted Answer

Exposure to sunlight

Question 4

Which equation correctly represents the calculation of the number of neutrons in an atom?

Accepted Answer

$$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}$$

Question 5

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms

Question 6

Water has unique properties such as high specific heat and cohesion. Which type of bond is primarily responsible for these properties?

Accepted Answer

Hydrogen bonds

Question 7

A buffer solution is added to a solution with a pH of 4. What is the primary function of the buffer?

Accepted Answer

To prevent drastic changes in pH when acids or bases are added

Question 8

Which equation is used to calculate pH from the concentration of hydrogen ions?

Accepted Answer

$$	ext{pH} = -\log_{10} [	ext{H}^+]$$

Question 9

Which of the following is a correct example of a hydrolysis reaction in biological systems?

Accepted Answer

Breaking down a polymer into monomers by adding water

Question 10

Which class of organic molecules includes enzymes, and what determines their specific function?

Accepted Answer

Proteins; the sequence of amino acids

Question 11

Which of the following best describes the difference between polar and nonpolar covalent bonds?

Accepted Answer

Polar covalent bonds share electrons unequally, resulting in partial charges; nonpolar covalent bonds share electrons equally.

Question 12

Which of the following is a correct sequence of biological organization from smallest to largest?

Accepted Answer

Atom → Molecule → Cell → Organism → Ecosystem

Question 13

A double-blind study is designed to minimize which type of bias?

Accepted Answer

Bias from both participants and researchers

Question 14

Which of the following statements about lipids is TRUE?

Accepted Answer

Lipids are primarily hydrophobic molecules.

Question 15

Which type of chemical reaction is responsible for the formation of polymers from monomers?

Accepted Answer

Dehydration synthesis

Question 16

A solution has a pH of 8. Which of the following best describes this solution?

Accepted Answer

It is basic (alkaline).

Question 17

Which of the following is a correct example of a controlled experiment?

Accepted Answer

Testing the effect of fertilizer on plant growth by using identical plants, soil, and water, but varying only the amount of fertilizer.

Question 18

Which of the following is a property of water that is critical for life on Earth?

Accepted Answer

Ability to dissolve many substances (universal solvent)

Question 19

Which subatomic particle determines the chemical identity of an element?

Accepted Answer

Proton

Question 20

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

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds create an open lattice structure.

General Biology: Foundations, Chemistry, and Biological Molecules

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