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

$\text{Atomic mass} = \text{Number of protons} + \text{Number of neutrons}$

Q: An atom has an atomic number of 8 and an atomic mass of 18. How many neutrons does it have?

$\text{Number of neutrons} = 18 - 8 = 10$

Question 1

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

Accepted Answer

Molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere

Question 2

A scientist is testing the effect of a new fertilizer on plant growth. She grows 10 plants with the fertilizer and 10 without, keeping all other conditions the same. What is the purpose of the group without fertilizer?

Accepted Answer

It serves as the control group to compare the effect of the fertilizer.

Question 3

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

Accepted Answer

Ability to photosynthesize

Question 4

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, while prokaryotic cells do not.

Question 5

In an ecosystem, which of the following best describes the role of decomposers?

Accepted Answer

They recycle nutrients by breaking down dead organisms and waste.

Question 6

Which of the following kingdoms is NOT included in the domain Eukarya?

Accepted Answer

Bacteria

Question 7

Natural selection can best be described as:

Accepted Answer

The process by which organisms with advantageous traits survive and reproduce more successfully.

Question 8

A valid scientific hypothesis must:

Accepted Answer

Be testable and falsifiable.

Question 9

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

Accepted Answer

$	ext{Atomic mass} = 	ext{Number of protons} + 	ext{Number of neutrons}$

Question 10

An atom has an atomic number of 8 and an atomic mass of 18. How many neutrons does it have?

Accepted Answer

$	ext{Number of neutrons} = 18 - 8 = 10$

Question 11

Which type of chemical bond holds the hydrogen and oxygen atoms together within a single water molecule?

Accepted Answer

Covalent bond

Question 12

What property of water allows it to move upward from the roots to the leaves in plants?

Accepted Answer

Cohesion and adhesion

Question 13

Why does ice float on liquid water?

Accepted Answer

Ice is less dense than liquid water due to the arrangement of hydrogen bonds.

Question 14

A solution has a pH of 4. Which of the following best describes this solution?

Accepted Answer

It is acidic.

Question 15

Which of the following best describes the function of a buffer in a biological system?

Accepted Answer

It minimizes changes in pH when acids or bases are added.

Question 16

Which of the following is a real-life example of adhesion?

Accepted Answer

Water droplets sticking to a glass window after rain

Question 17

A neutral atom of sodium has an atomic number of 11 and an atomic mass of 23. How many electrons does it have?

Accepted Answer

$	ext{Number of electrons} = 	ext{Atomic number} = 11$

Question 18

Which of the following best explains why energy flows through an ecosystem while nutrients are recycled?

Accepted Answer

Energy is lost as heat at each trophic level, while nutrients are reused by producers, consumers, and decomposers.

Question 19

Which of the following is a property of water that helps moderate Earth's climate?

Accepted Answer

High specific heat capacity

Question 20

A patient is given a solution with a pH of 9. Which of the following best describes this solution and its effect on the patient's blood pH?

Accepted Answer

It is basic and could increase the patient's blood pH if not buffered.

Study Guide: Themes in Biology & The Chemical Basis of Life (Chapters 1 & 2)

Study Guide - Practice Questions

Study Guide - Flashcards