general science

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Questions and Answers

Which structure is not considered one of the main parts of a cell?

Cell membrane
Cell wall (correct)
Cytoplasm
Nucleus

What defines a multicellular organism?

An organism that has a nucleus in every cell
An organism composed of many cells (correct)
An organism made up of only one cell
An organism that can survive without cells

What is the function of the cell membrane?

To store genetic material
To provide structural support
To generate energy for the cell
To protect the cell and regulate entry and exit of substances (correct)

Which part of the cell contains the genetic material?

Nucleus (B) Signup and view all the answers

Which statement about living organisms is true?

All living organisms are made up of cells. (B) Signup and view all the answers

What is the primary role of cytoplasm in a cell?

To hold organelles and facilitate chemical reactions (B) Signup and view all the answers

What distinguishes unicellular organisms from multicellular organisms?

Unicellular organisms are made up of only one cell. (A) Signup and view all the answers

In which level of biological organization do cells first emerge?

Cells (B) Signup and view all the answers

What is a defining characteristic of unicellular organisms compared to multicellular organisms?

They consist of only one cell. (A) Signup and view all the answers

Which of the following organelles is present in both plant and animal cells?

Cytoplasm (B) Signup and view all the answers

What role does the nucleus play in a cell?

It controls cell activities and reproduction. (D) Signup and view all the answers

In which type of cells would you find chloroplasts?

Plant cells only (A) Signup and view all the answers

How does the cell membrane function in both plant and animal cells?

It regulates the entry and exit of materials. (D) Signup and view all the answers

Which statement distinguishes multicellular organisms from unicellular organisms?

They contain specialized cells for different functions. (C) Signup and view all the answers

What is the main function of the cytoplasm within a cell?

To facilitate chemical processes. (A), To provide energy. (B), To protect genetic material. (C), To aid in cell division. (D) Signup and view all the answers

Which of the following features is common between plant cells and animal cells?

Cell membrane and nucleus. (B), Rigidity due to a cell wall. (A), Presence of chloroplasts. (C), Ability to photosynthesize. (D) Signup and view all the answers

What is a cell commonly referred to as in biological terms?

The smallest unit of life (B) Signup and view all the answers

Which of the following represents a unicellular organism?

Yeast (C), Elephant (A), Tree (B), Human (D) Signup and view all the answers

How can organisms be classified based on the number of cells they have?

Multicellular and unicellular (C) Signup and view all the answers

Which of the following best explains the importance of biology in society?

It enables us to understand and use living organisms for various purposes. (B), It simplifies the study of other sciences. (A), It helps us live longer without health issues. (C), It ensures every organism is perfectly classified. (D) Signup and view all the answers

Which of the following statements about multicellular organisms is true?

They have differentiated cells performing various functions. (D) Signup and view all the answers

Which function is the primary purpose of a microscope?

To enable visibility of fine details in small samples (A), To provide a three-dimensional view of samples (B), To increase the size of any object (C), To replace the need for larger specimens (D) Signup and view all the answers

What is the origin of the word 'cell' in biological context?

Latin word meaning small room (A) Signup and view all the answers

What distinguishes a plant cell from an animal cell?

Plant cells have a rigid cell wall, while animal cells do not. (A), Animal cells contain chloroplasts, while plant cells do not. (B), Animal cells solely exist as single cells, while plants do not. (C), Plant cells contain nuclei, while animal cells do not. (D) Signup and view all the answers

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Study Notes

The Cell

The cell is the fundamental building block of life, often referred to as the smallest unit of life.
Most cells are extremely small, requiring microscopes to be visible.
Living organisms can be categorized as unicellular (single-celled) or multicellular (composed of multiple cells).
Unicellular organisms include bacteria, algae, and protozoans like amoeba and paramecium.
Multicellular organisms include plants and animals.

Inside a Cell

The three primary components of a cell visible under a compound microscope are:
- Cell membrane (plasma membrane)
- Cytoplasm
- Nucleus

Plant and Animal Cell Comparison

Animal and plant cells share common components like the cell membrane, nucleus, and cytoplasm.
The cell membrane regulates the movement of substances into and out of the cell.
The nucleus controls cellular reproduction and overall activity.
The cytoplasm houses various structures where chemical processes occur.
Plant cells possess additional structures not found in animal cells:
- Cell wall
- Chloroplasts
- Central vacuole