What do you know about life's most essential building block? Take our quiz on human body cells!

CORRECT ANSWERS: 0

How does your body make new cells? Where did the term "cell" originate? What are the different parts of a cell, and what are their jobs? Take the quiz to see how much you know about these tiny yet vital components.

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Question 1 of 20

Who coined the term "cell"?

Francis Crick
Isaac Newton
James Watson
Robert Hooke

... Robert Hooke first observed cork cells in 1665. The numerous small squares reminded him of monastery rooms or "cells."

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Question 2 of 20

Which of the following is NOT a basic component of cell theory?

All cells have nuclei.
Living things are made of cells.
New cells come from other living cells.
The cell is the smallest living thing that can carry out life functions.

... Most, but not all, cells have nuclei. For instance, red blood cells do not.

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Question 3 of 20

What is the difference between the two basic categories of cells: prokaryotes and eukaryotes?

Eukaryote cells have no communication among them.
Eukaryote cells can be found almost anywhere on earth.
Prokaryotes have organelles.
Prokaryotes have no membranes surrounding their nuclei.

... Prokaryotes, such as bacteria, are single-celled organisms that have no nuclear membrane. They were the first form of life on earth.

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Question 4 of 20

Stem cells are important because they ________.

are the brain's cells
can change into other types of cells
carry oxygen to all parts of the body
convert food into energy for the body

... Stem cells are central to regenerative medicine because they can change into other cells, such as for bone or muscle. Consequently, stem cells are vital to research into and treatment of diseases such as Parkinson's and cancer.

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Question 5 of 20

Within a cell, the primary responsibility of mitochondria is _______.

generating energy
removing waste
reproducing
transporting molecules

... Mitochondria represent the "power house" of the cell, producing ATP, the cell's chemical energy.

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Question 6 of 20

What is one reason viruses are not classified as cells?

They are much larger than cells.
They cannot mutate.
They depend upon their host in order to reproduce.
They do not contain any genetic information.

... Unlike cells, viruses cannot reproduce on their own; they must have a host.

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Question 7 of 20

Cell replication occurs during the process of _________, resulting in identical cells.

differentiation
fertilization
mitosis
necrosis

... During mitosis, a cell divides and creates two daughter cells.

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Question 8 of 20

Red blood cells are produced in the _____.

bones
heart
kidneys
liver

... Red blood cells, which help carry oxygen throughout the body, are produced in bone marrow. It takes about seven days for a red blood cell to develop.

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Question 9 of 20

About 100 _____ cells are in an adult human body.

million
billion
trillion
quadrillion

... An adult has about 100 trillion cells, including somatic (body), germ (egg or sperm) and stem cells.

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Question 10 of 20

The primary difference between animal and plant cells is that _______.

animal cells have walls
plant cells have walls
animal cells have membranes
plant cells have membranes

... A plant cell has a cell wall that provides additional structure and protection for the organism.

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Question 11 of 20

Communication among nerve cells requires _______.

electricity
enzymes
hormones
neuro-chemicals

... Chemicals called neurotransmitters complete the pathways among neurons (nerve cells). There are about one hundred different neurotransmitters, including dopamine, histamine and melatonin.

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Question 12 of 20

A cell must have _______ that allow(s) chemical reactions to occur.

DNA
enzymes
hormones
water

... Enzymes are essential within a cell, speeding up the chemical reactions that occur. Enzymes include lactase and tryptophan.

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Question 13 of 20

The antibiotic penicillin attacks the _______ of bacteria.

cytoplasm
DNA
RNA
walls

... Penicillin interferes with bacteria's ability to properly make cell walls. The walls are fragile and burst easily, killing the bacteria.

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Question 14 of 20

The study of the structure and function of cells is called _______.

cetology
cytology
dendrology
endocrinology

... Cytologists use microscopes and stains to study cells and tissues of organisms.

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Question 15 of 20

Water, carbon dioxide and oxygen all commonly move in and out of cells through _______.

active transport
endocytosis
osmosis
simple diffusion

... Several types of molecules use simple diffusion to move from areas of higher concentration to areas of lower concentration.

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Question 16 of 20

Egg and sperm cells are produced by the process of ________.

cytomegaly
meiosis
mitosis
synthesis

... After the process of meiosis, each sperm or egg has half the usual number of chromosomes. That facilitates the combination of chromosomes that takes place during fertilization, so the resulting zygote has obtained half of its genetic material from each parent.

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Question 17 of 20

The first synthetic cell was based on the genome of a _______.

bacterium
fungi
protozoa
virus

... In 2010, a lab-created bacterial genome was placed inside a cell and took over that cell.

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Question 18 of 20

New skin cells are made in the bottom layer of skin, taking about _____ to move to the top layer.

one day
one week
one month
one year

... Your skin completely replaces itself about once a month.

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Question 19 of 20

An elevated number of white blood cells can indicate _________.

bone disease
a drug reaction
an infection
all of the above

... White blood cells are part of the immune system, so they increase in the presence of infection. Their numbers can also be affected by drugs designed to stimulate their production. In addition, since they are produced in the bone marrow, an exceptionally high quantity may indicate a marrow disease.

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Question 20 of 20

About how many different kinds of cells are there in the human body?

50
200
500
1,200

... There are about 200 different types of cells in our bodies, varying from rather general (e.g., muscle cells) to highly specific (e.g., tooth enamel-making cells).

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