Question 1

Which component of the plant cell wall is primarily responsible for cell adhesion and acts as a binding agent between adjacent plant cells?

Accepted Answer

Pectin in the middle lamella

Question 2

A plant cell is exposed to excessive water intake. Which structural feature of the cell helps prevent osmotic lysis?

Accepted Answer

The rigid structure of the cell wall

Question 3

According to the fluid mosaic model, which of the following is TRUE about the cell membrane?

Accepted Answer

Integral proteins are embedded within the membrane, while peripheral proteins are attached to its surface.

Question 4

Which process describes a cell engulfing external substances by forming a vesicle from the plasma membrane?

Accepted Answer

Endocytosis

Question 5

A mutation causes a plant to produce less pectin. Which of the following would most likely be affected?

Accepted Answer

The adhesion between plant cells

Question 6

Which of the following best explains why glycolipids and glycoproteins are important for cell membranes?

Accepted Answer

They act as receptors and help in cell recognition and signaling.

Question 7

During protein synthesis, which part of the ribosome is responsible for reading the mRNA sequence?

Accepted Answer

The small subunit

Question 8

Which of the following is a direct function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Protein folding and modification

Question 9

A scientist observes a cell with a double-membrane nuclear envelope, chromatin, and a nucleolus. What type of cell is this most likely to be?

Accepted Answer

A eukaryotic cell

Question 10

Which of the following statements about the primary cell wall in plants is correct?

Accepted Answer

It is thin, flexible, and present in all growing cells.

Question 11

Which of the following best describes the role of the cytoskeleton in the cell membrane?

Accepted Answer

It provides structural support and helps maintain the membrane's shape.

Question 12

If a cell loses its ability to perform exocytosis, which of the following would most likely occur?

Accepted Answer

The cell would accumulate waste products internally.

Question 13

Which of the following is NOT a function of the plant cell wall?

Accepted Answer

Regulating protein synthesis

Question 14

Which of the following structures is directly involved in the modification and packaging of proteins after they are synthesized?

Accepted Answer

Golgi apparatus

Question 15

A cell is observed to have many ribosomes attached to its endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Protein synthesis for export

Question 16

Which of the following best explains why the cell membrane is described as 'selectively permeable'?

Accepted Answer

It allows some substances to pass while restricting others.

Question 17

Which of the following is a function of glycoproteins in the cell membrane?

Accepted Answer

Serving as receptors for signaling molecules

Question 18

Which organelle is responsible for holding the genetic material and controlling cellular activities in eukaryotic cells?

Accepted Answer

Nucleus

Question 19

During protein synthesis, what is the role of tRNA at the ribosome?

Accepted Answer

It carries amino acids to the ribosome for polypeptide assembly.

Question 20

Which of the following best describes the relationship between the nucleus and ribosomes in eukaryotic cells?

Accepted Answer

The nucleus contains the genetic code, and the nucleolus produces ribosomal RNA for ribosome assembly.

Cell Structure and Function: Protection, Homeostasis, and Protein Synthesis

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