Cells

Ethan observed an organism under his microscope and found that it is made up of only one cell. What type of organism is it?

• Organelle

• Unicellular

• Multicellular

• Cellular

Answer explanation

The question asks about an organism composed of a single cell. The correct answer is 'Unicellular'. 'Unicellular' means consisting of one cell, directly aligning with the question. 'Organelle' is a part of a cell, 'Multicellular' means consisting of multiple cells, and 'Cellular' is a general term related to cells, not specifying the number.

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What does multicellular mean?

• An organism made up of one cell

• An organism made up of more than one, often different, cells

• The basic structural and functional unit in living things

• A cell made up of more than one organelle

Answer explanation

The term 'multicellular' refers to an organism made up of more than one, often different, cells. This is in contrast to unicellular organisms, which consist of only one cell. Each type of cell in a multicellular organism has a specific function that contributes to the overall survival of the organism.

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NGSS.MS-LS1-1

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During a science class, Oliver, Aria, and Emma were discussing about different materials. They were trying to identify which of the following would not be made from cells. Can you help them?

• A dog that Oliver saw in the park

• The mold on the bread that Aria found in her lunchbox

• The dead flower that Emma found on her way to school

• The rock that they found during their field trip

Answer explanation

In the given question, we are asked to identify which among the given options would not be made from cells. The options presented were a dog, mold, a dead flower, and a rock. Among these, a rock is the only one that is not made from cells. Dogs, mold, and even dead flowers are biological and thus, made up of cells.

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NGSS.MS-LS1-1

A cell is a fundamental unit of _________________in all living organisms.

• Function

• Structure

• Organization

• Structure, Function, and Organization

Answer explanation

The question asks about the fundamental unit in all living organisms. The correct answer is 'Structure, Function, and Organization'. This is because, in all living organisms, the cell serves as the basic unit of structure (what it is made up of), function (what it does), and organization (how it is arranged).

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What is an organism?

• Something made from one cell

• A self-contained living thing

• The basic structural and functional unit in living things

• an individual animal, plant, or single-celled life form.

Evelyn, Jackson, and Michael are studying different organisms for their biology project. They found that all of the following are unicellular organisms EXCEPT-

• Bacteria

• Amoebas

• Ferns (a type of plant)

• Paramecia

Answer explanation

The question asks which of the given options is not a unicellular organism. Unicellular organisms are made up of only one cell. While bacteria, amoebas, and paramecia are all unicellular organisms, ferns, which are a type of plant, are not. They are multicellular, meaning they are made up of many cells.

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NGSS.MS-LS1-1

The rigid out later of the membrane of a cell is called

• a cell membrane

• cytoplasm

• a nucleus

• a cell wall

Answer explanation

The question asks for the rigid outer layer of a cell's membrane. Among the options provided, a cell membrane, cytoplasm, a nucleus, and a cell wall, the correct answer is a cell wall. It is the rigid structure that provides an outer protective layer to the cell, especially in plants, bacteria, and fungi.

The material within a living cell is called

• cytoplasm

• a nucleus

• function

• cellular

Answer explanation

The question asks about the material within a living cell. The correct choice is cytoplasm which is the material within a living cell. The cytoplasm is a complex solution of substances dissolved in water. Other options like nucleus, function and cellular do not accurately describe the material within a living cell.

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The definition of a cell is

• What something does

• The rigid outer layer of the membrane

• a lipid barrier that encloses the cytoplasm

• the basic structural and functional unit in living organisms

Answer explanation

A cell is the basic structural and functional unit in living organisms, encompassing all biological life. It differs from the other options as it is not simply what something does, nor the rigid outer layer of the membrane, nor a lipid barrier enclosing the cytoplasm. This definition encompasses a broader understanding of the cell's role in biology.

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NGSS.MS-LS1-1

The cell wall in plant cells provides which of the following functions?

• Movement

• Energy

• Chemical storage

• Protection and Structure

Answer explanation

The cell wall in plant cells delivers two primary functions: protection and structure. It protects the plant cell from injury and provides the cell with its shape, thereby giving the plant its overall structure. Thus, the correct answer to the question is 'Protection and Structure'.