Lesson 2 The Cell as a System

What is the brief history of the cell?

• The history of the cell dates back to ancient Greece

• Cells were discovered in the 20th century

• Cells were first discovered by Robert Hooke in 1665, and the cell theory was proposed by Matthias Schleiden and Theodor Schwann in the 19th century.

• The cell theory was proposed by Isaac Newton

Answer explanation

Cells were first discovered by Robert Hooke in 1665, and the cell theory was proposed by Matthias Schleiden and Theodor Schwann in the 19th century.

Why is using a microscope important in viewing cells?

• To make cells more colorful

• To make cells taste better

• To add texture to cells

• To magnify the image of cells for better observation.

Answer explanation

Using a microscope is important in viewing cells to magnify the image for better observation, allowing for detailed examination of cell structures.

What are the main components of a cell?

• DNA, RNA, proteins, carbohydrates

• mitochondria, Golgi apparatus, endoplasmic reticulum, lysosomes

• cell membrane, cytoplasm, nucleus, organelles

• cell wall, vacuole, chloroplast, ribosomes

Answer explanation

The main components of a cell include the cell membrane, cytoplasm, nucleus, and organelles, which are responsible for various cellular functions.

Tags

NGSS.MS-LS1-2

Who was the first scientist to use the word “cell”

• Newton

• Hooke

• Edison

• Einstein

Answer explanation

The correct choice is Hooke because he was the first scientist to use the word 'cell' in reference to biological structures.

What is the function of the cell membrane?

• Stores genetic information

• Produces energy for the cell

• Controls the movement of substances in and out of the cell, maintains cell shape, and provides protection.

• Regulates cell division

Answer explanation

The function of the cell membrane is to control the movement of substances in and out of the cell, maintain cell shape, and provide protection.

Tags

NGSS.MS-LS1-2

The nucleus was discovered during an observation of an enormous ………………………… cell

• animal

• bacterial

• human

• plant

Answer explanation

The correct choice is 'plant' because the nucleus was discovered during an observation of a plant cell, not an animal, bacterial, or human cell.

Tags

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Scientists concluded that the ………………………… is the basic unit of the organism’s structure

• cell

• organ

• tissue

• system

Answer explanation

Scientists concluded that the cell is the basic unit of the organism’s structure, highlighting the correct choice.

Tags

NGSS.MS-LS1-1

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All the following are form the parts of a compound microscope, except the ……………

• eyepiece

• objective lenses

• illuminator

• objective mirrors

Answer explanation

The correct choice is 'illuminator' because it is not a part of a compound microscope, unlike the eyepiece, objective lenses, and objective mirrors.

The membrane of an onion consists of similar units called

• cells

• nuclei

• organs

• tissues

Answer explanation

The correct units that make up the membrane of an onion are cells, not nuclei, organs, or tissues.

Tags

NGSS.MS-LS1-1

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You can change the power of magnifying of a microscope by using another

• objective lens

• eyepiece

• mirror

• arm

Answer explanation

To change the power of magnifying of a microscope, you can use another objective lens, not the eyepiece, mirror, or arm.