Chap. 7.1 & 7.3 Review

The basic structural and functional unit of all living organisms.

• Cells

• Organelles

• Skeleton

• Eukaryotes

Answer explanation

Cells are the basic structural and functional units of all living organisms, responsible for carrying out essential life processes. Organelles are components within cells, while skeletons and eukaryotes refer to structures and classifications, respectively.

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Which statement about cells is TRUE?

• They are only in plants

• They are only in animals

• They are in all living things

• They are really large

Answer explanation

The correct statement is that cells are in all living things. Cells are the basic unit of life and are found in plants, animals, fungi, and microorganisms, making them universal to all forms of life.

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NGSS.MS-LS1-1

Which organelle is only in PLANT cells?

• Cell Membrane

• Mitochondrion

• Nucleus

• Chloroplast

Answer explanation

Chloroplasts are organelles found only in plant cells, responsible for photosynthesis. In contrast, cell membranes, mitochondria, and nuclei are present in both plant and animal cells.

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This scientist is known for discovering the nucleus in plant cells.

• Robert Brown

• Robert Frost

• Charlie Brown

• Charles Dickens

Answer explanation

Robert Brown is the scientist credited with discovering the nucleus in plant cells. His work in microscopy led to this significant finding, distinguishing him from the other names listed.

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This scientist is credited with proposing the Cell Theory in 1855.

• Rudolf Reindeer

• Robert Hooke

• Rudolf Virchow

• Robert Brown

Answer explanation

Rudolf Virchow is credited with proposing the Cell Theory in 1855, emphasizing that all cells arise from pre-existing cells. This was a key development in understanding cellular biology.

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The "brain" of the cell that controls the cell function is called the

• Nucleus

• Vacuole

• Mitochondria

• Cytoplasm

Answer explanation

The nucleus is known as the "brain" of the cell because it controls cell functions by regulating gene expression and mediating the replication of DNA during the cell cycle.

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Which cell structure is found in plant and animals cells and controls what can come into or leave a cell?

• cell membrane

• cytoplasm

• nucleus

• vacuole

Answer explanation

The cell membrane is found in both plant and animal cells and regulates the movement of substances in and out of the cell, making it the correct answer.

Tags

NGSS.MS-LS1-2

Cells with a nucleus and membrane-bound organelles are called ____________________.

• prokaryotes

• eukaryotes

• bacteria

• coyotes

Answer explanation

Cells with a nucleus and membrane-bound organelles are classified as eukaryotes. In contrast, prokaryotes lack a nucleus and membrane-bound organelles, and bacteria are a type of prokaryote.

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Which of the following is NOT part of the cell theory?

• cells must contain DNA

• all living things are made from cells

• cells can only come from other cells

• cells are the basic unit of life

Answer explanation

The statement "cells must contain DNA" is NOT part of the cell theory. The cell theory states that all living things are made of cells, cells arise from pre-existing cells, and cells are the basic unit of life.

He discovered that all plants are made of cells:

• Anton van Leeuwenhoek

• Theordor Schwann

• Robert Hooke

• Mattias Schleiden

Answer explanation

Mattias Schleiden concluded that all plants are composed of cells, contributing to the cell theory. While Robert Hooke discovered cells, it was Schleiden who specifically focused on plant cells.

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