Q: Which equation correctly represents the process of photosynthesis occurring in chloroplasts?

$$6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 1

Which of the following statements best describes a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, whereas prokaryotic cells do not.

Question 2

A scientist discovers a unicellular organism with a cell wall made of peptidoglycan, no nucleus, and circular DNA. Which domain does this organism most likely belong to?

Accepted Answer

Bacteria

Question 3

Which cellular structure is responsible for synthesizing proteins from mRNA instructions?

Accepted Answer

Ribosome

Question 4

Which of the following best explains why the nucleus is separated from the cytoplasm by a double membrane?

Accepted Answer

To keep DNA and the enzymes that work with DNA confined and protected from other cellular enzymes.

Question 5

A mutation disrupts the function of the rough endoplasmic reticulum (ER) in a cell. Which process would be most directly affected?

Accepted Answer

Protein folding and modification

Question 6

Which organelle is most directly involved in packaging and modifying proteins for secretion or delivery to other organelles?

Accepted Answer

Golgi apparatus

Question 7

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall made of cellulose. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 8

Which equation correctly represents the process of photosynthesis occurring in chloroplasts?

Accepted Answer

$$6CO_2 + 6H_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6O_2$$

Question 9

According to the endosymbiosis theory, which organelles are believed to have originated from ancient prokaryotic cells engulfed by a host cell?

Accepted Answer

Mitochondria and chloroplasts

Question 10

Which cytoskeletal component is primarily responsible for cell division and the movement of chromosomes during mitosis?

Accepted Answer

Microtubules

Question 11

A patient’s cardiac muscle cells are unable to efficiently transmit electrical signals between adjacent cells. Which type of cell junction is most likely defective?

Accepted Answer

Gap junctions

Question 12

Which of the following is a function of the lysosome in animal cells?

Accepted Answer

Breakdown of old organelles and cellular debris

Question 13

Which structure allows plant cells to communicate and transfer small molecules directly between adjacent cells?

Accepted Answer

Plasmodesmata

Question 14

Which of the following best describes the composition of the plasma membrane?

Accepted Answer

A bilayer of phospholipids with embedded proteins and other lipids

Question 15

Which organelle contains its own DNA and ribosomes, supporting the endosymbiosis theory?

Accepted Answer

Mitochondrion

Question 16

A freshwater protist uses contractile vacuoles to maintain osmotic balance. What is the primary function of these vacuoles?

Accepted Answer

Remove excess water from the cell

Question 17

Which of the following is NOT a function of the cytoskeleton?

Accepted Answer

Protein synthesis

Question 18

Which cell surface structure is found in animal cells and forms a leak-proof layer between cells, such as in the digestive tract?

Accepted Answer

Tight junctions

Question 19

Which of the following best explains why mitochondria are considered the 'powerhouse' of the cell?

Accepted Answer

They produce ATP via cellular respiration, extracting energy from biological molecules.

Question 20

Which of the following cell wall compositions is correctly matched to its organism?

Accepted Answer

Peptidoglycan in bacteria

Introduction to Cells: Structure, Types, and Functions

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