Lecture 3

Which of the following is a key difference between plant and animal cells?

• Animal cells have a cell wall, while plant cells do not.

• Plant cells have plasmodesmata, while animal cells do not.

• Animal cells have chloroplasts, while plant cells do not.

• Plant cells lack mitochondria, while animal cells have them.

What is the primary role of the extracellular matrix (ECM) in animal cells?

• Preventing excessive water uptake

• Facilitating photosynthesis

• Providing structural support and communication between cells

• Maintaining chromosome separation during cell division

Which of the following best describes the '9 + 2' arrangement in cilia and flagella?

• Nine triplets of microtubules arranged in a ring

• Nine doublets of microtubules arranged around two central microtubules

• A structure exclusive to plant cells for cytoplasmic streaming

• A pattern found in the basal body anchoring cilia

Which intercellular junction prevents the leakage of extracellular fluid between cells?

• Desmosomes

• Gap junctions

• Tight junctions

• Plasmodesmata

How does centrifuging separate the different organelles in a celll?

• By breaking the organelles into smaller pieces

• By using temperature to dissolve certain organelles

• By forcing organelles to float to the top of the solution

• By spinning the cell contents to separate organelles based on size and density

Bacterial cells are prokaryotic. Unlike a typical eukaryotic cell, they __________.

• have no ribosomes

• have a smaller nucleus

• have no membrane-bounded organelles in their cytoplasm

• lack chromosomes

You would expect a cell with an extensive Golgi apparatus to __________.

• store large quantities of ions

• make large amounts of ATP

• absorb nutrients in the GI tract

• secrete large amounts of protein