Question 1

Which of the following best describes the main difference between unicellular and multicellular organisms?

Accepted Answer

Unicellular organisms consist of a single cell, while multicellular organisms consist of multiple cells specialized for different functions.

Question 2

What is the smallest and most basic fundamental unit of life?

Accepted Answer

The cell

Question 3

Which property of water allows it to move upward from the roots of a tree to its leaves?

Accepted Answer

Capillary action, facilitated by cohesion and adhesion

Question 4

What determines the identity of an element?

Accepted Answer

The atomic number, or the number of protons in the nucleus

Question 5

Which of the following is NOT one of the four major classes of organic molecules?

Accepted Answer

Hydrocarbons

Question 6

A plant growing towards sunlight is an example of which property of living organisms?

Accepted Answer

Response to environmental stimuli

Question 7

What is the charge of a proton?

Accepted Answer

Positive (+1)

Question 8

Which molecule serves as the genetic material in all living organisms?

Accepted Answer

DNA

Question 9

What is the maximum number of electrons in the first energy shell of an atom?

Accepted Answer

$$2$$

Question 10

Which of the following best explains why water has a high surface tension compared to most other liquids?

Accepted Answer

Water's hydrogen bonds create strong cohesive forces between molecules

Question 11

Which of the following is a trace element essential for life, found in only very small amounts in living organisms?

Accepted Answer

Iron

Question 12

Which property of water is responsible for its ability to transport nutrients upward in plants against gravity?

Accepted Answer

Cohesion and adhesion

Question 13

What is the significance of the nucleus in an atom?

Accepted Answer

It contains most of the atom's mass and is composed of protons and neutrons

Question 14

Which of the following best describes homeostasis in humans?

Accepted Answer

Sweating to cool off the body in hot environments

Question 15

Which of the following is the most abundant element in living systems, excluding water?

Accepted Answer

Carbon

Question 16

What is the literal meaning of 'biology'?

Accepted Answer

The scientific study of life

Question 17

Which of the following best explains why viruses are not considered alive?

Accepted Answer

Viruses lack key characteristics of life, such as the ability to reproduce on their own

Question 18

Which of the following is a characteristic of hydrocarbons?

Accepted Answer

They contain only carbon and hydrogen atoms

Question 19

Which of the following best describes the function of valence electrons in chemical bonding?

Accepted Answer

Valence electrons are involved in forming chemical bonds

Question 20

Which of the following best explains the role of cohesion in water's properties?

Accepted Answer

Cohesion is the ability of water molecules to stick to each other through hydrogen bonds

General Biology: Cells, Atoms, Water, and Organic Molecules

Study Guide - Practice Questions