Q: Which of the following is the correct formula for calculating atomic mass?

$\text{Atomic Mass} = \text{Number of Protons} + \text{Number of Neutrons}$

Q: Which of the following is the correct formula for calculating pH?

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

Question 1

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

Accepted Answer

A hypothesis is a tentative explanation that can be tested, while a theory is a well-supported explanation based on a body of evidence.

Question 2

Which of the following is NOT one of the 7 characteristics of life?

Accepted Answer

Ability to photosynthesize

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 of the following best illustrates homologous structures?

Accepted Answer

The flippers of a whale and the arms of a human

Question 5

Which evidence most strongly supports the theory of natural selection?

Accepted Answer

The fossil record showing gradual changes in species over time

Question 6

Which of the following correctly lists the biological levels of organization from smallest to largest?

Accepted Answer

Atom, molecule, cell, tissue, organ, organism

Question 7

Which of the following is the correct formula for calculating atomic mass?

Accepted Answer

$	ext{Atomic Mass} = 	ext{Number of Protons} + 	ext{Number of Neutrons}$

Question 8

Which statement about ions is correct?

Accepted Answer

An anion has more electrons than protons.

Question 9

If an atom has 6 protons, 6 neutrons, and 6 electrons, what is its atomic number and atomic mass?

Accepted Answer

Atomic number: 6, Atomic mass: 12

Question 10

Which of the following best describes the difference between dehydration synthesis and hydrolysis?

Accepted Answer

Dehydration synthesis builds polymers by removing water, while hydrolysis breaks them down by adding water.

Question 11

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

Accepted Answer

Cohesion due to hydrogen bonding

Question 12

Which of the following is the correct formula for calculating pH?

Accepted Answer

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

Question 13

Which macromolecule is primarily responsible for catalyzing chemical reactions in living organisms?

Accepted Answer

Proteins

Question 14

Which of the following is a function of phospholipids in biological membranes?

Accepted Answer

Forming a bilayer that separates cell contents from the environment

Question 15

Which of the following is an example of a polysaccharide?

Accepted Answer

Starch

Question 16

Which of the following best explains why water is a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, creating a partial negative charge on oxygen and a partial positive charge on hydrogen.

Question 17

Which of the following is NOT a function of proteins?

Accepted Answer

Storing genetic information

Question 18

Which of the following best describes denaturation of a protein?

Accepted Answer

Loss of protein's three-dimensional structure due to environmental changes

Question 19

Which of the following is true about isotopes?

Accepted Answer

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

Question 20

Which of the following is the correct order of taxonomic levels from most inclusive to least inclusive?

Accepted Answer

Kingdom, Phylum, Class, Order, Family, Genus, Species

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