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BI 112 Questions and Answers Already Passed
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112 Questions and Answers Already Passed How do cells generate energy in the absence of oxygen? Cells generate energy through anaerobic respiration or fermentation when oxygen is not available. What is the role of spindle fibers during mitosis? Spindle fibers help separate chromosomes d...

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  • October 5, 2024
  • 22
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • bi 112 questions and answers already passed

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  • BI 112
  • BI 112

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BI 112 Questions and Answers Already
Passed
How do cells generate energy in the absence of oxygen?


✔✔Cells generate energy through anaerobic respiration or fermentation when oxygen is not

available.




What is the role of spindle fibers during mitosis?


✔✔Spindle fibers help separate chromosomes during cell division, ensuring each daughter cell

gets the correct number of chromosomes.




Why is the smooth endoplasmic reticulum important in lipid synthesis?


✔✔The smooth endoplasmic reticulum is responsible for synthesizing lipids and detoxifying

harmful substances in the cell.




How do cells communicate with each other?


✔✔Cells communicate through chemical signals, such as hormones and neurotransmitters,

which bind to receptors on the cell surface.




1

,What is the significance of the G1 phase in the cell cycle?


✔✔The G1 phase is crucial for cell growth and preparation for DNA replication, ensuring the

cell is ready for division.




What is the function of plasmids in bacterial cells?


✔✔Plasmids are small, circular DNA molecules in bacteria that can carry additional genes, such

as antibiotic resistance.




How do cilia and flagella differ in their function and structure?


✔✔Cilia are short and numerous, moving fluids or materials across the cell surface, while

flagella are longer and fewer, propelling cells through a liquid environment.




What is the role of peroxisomes in a cell?


✔✔Peroxisomes break down fatty acids and detoxify harmful substances, such as hydrogen

peroxide.




Why is the surface area-to-volume ratio important for cell efficiency?


✔✔A higher surface area-to-volume ratio allows for more efficient exchange of materials

between the cell and its environment.

2

, How does DNA packing affect gene expression?


✔✔Tightly packed DNA (heterochromatin) is less accessible for transcription, reducing gene

expression, while loosely packed DNA (euchromatin) is more actively transcribed.




What happens during cytokinesis?


✔✔During cytokinesis, the cytoplasm of a parent cell divides, resulting in two daughter cells,

each with its own set of organelles and genetic material.




Why is the Krebs cycle important in cellular respiration?


✔✔The Krebs cycle produces electron carriers (NADH and FADH2) that are essential for

generating ATP in the electron transport chain.




What is the role of the extracellular matrix in animal cells?


✔✔The extracellular matrix provides structural support, helps with cell adhesion, and regulates

cellular communication.




How do cells maintain homeostasis in response to external changes?




3

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