Cell Structure and Function

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What percentage of the cell mass do proteins typically represent?

10-20% (correct)

20-30%

5-10%

30-40%

How many main types of proteins are mentioned in the text?

One

Three

Two (correct)

Four

Which type of proteins provide support and strength to cells and tissues?

Structural proteins (correct)

Hormonal proteins

Transport proteins

Enzymatic proteins

What is the typical range of percentage for functional proteins in the cell mass?

1-5% Signup and view all the answers

Which type of proteins are involved in catalyzing biochemical reactions?

Functional proteins Signup and view all the answers

What separates the nucleus from the cytoplasm?

Nuclear membrane Signup and view all the answers

What is the cell membrane also known as?

Plasma membrane Signup and view all the answers

Which of the following separates the cytoplasm from the surrounding fluids?

Cell membrane Signup and view all the answers

Which of the following statements is not true about the nucleus and cytoplasm?

The nucleus and cytoplasm are part of the same compartment Signup and view all the answers

What is the primary function of the cell membrane?

To separate the cell from its surroundings Signup and view all the answers

What would happen to cellular functions if cells were unable to extract enough energy from nutrients?

They would cease. Signup and view all the answers

How important is the extraction of energy from nutrients for cells?

It is crucial for cell functions. Signup and view all the answers

If cells do not extract sufficient energy, what impact does it have on cellular functions?

The functions cease. Signup and view all the answers

In the absence of adequate energy extraction, what can be said about the ability of cells to function?

It diminishes significantly. Signup and view all the answers

What happens to cells if they are unable to extract energy from nutrients according to the text?

They stop functioning correctly. Signup and view all the answers

Which of the following statements about cell membrane proteins is correct?

There are two types of proteins: integral proteins that protrude all the way through the membrane, and peripheral proteins that are attached only to one surface of the membrane. Signup and view all the answers

Which of the following best describes integral proteins?

They protrude all the way through the membrane, spanning its entire width. Signup and view all the answers

Which of the following best describes peripheral proteins?

They are attached only to one surface of the membrane and do not penetrate all the way through. Signup and view all the answers

Which of the following statements is incorrect about cell membrane proteins?

There are no other types of proteins in the cell membrane besides integral and peripheral proteins. Signup and view all the answers

What is the main difference between integral and peripheral proteins in the cell membrane?

Integral proteins protrude all the way through the membrane, while peripheral proteins are attached only to one surface. Signup and view all the answers

What selective properties do the protein channels possess?

They allow preferential diffusion of certain substances over others Signup and view all the answers

Which of the following statements is true about the protein channels?

They selectively allow diffusion of certain substances while restricting others Signup and view all the answers

What can be inferred about the function of these protein channels?

They regulate the movement of substances across a membrane Signup and view all the answers

Which of the following best describes the term 'preferential diffusion'?

Diffusion of substances at different rates Signup and view all the answers

What type of structures are these protein channels?

Pores or channels Signup and view all the answers