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Chapter 7- Biology 1A03 questions.docx

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Department
Biology
Course
BIOLOGY 1A03
Professor
Lovaye Kajiura
Semester
Winter

Description
Chapter 7: Inside the Cell 7. The differences between peroxisomes and vacuoles are first of the type of cell that both are located in; peroxisomes are located in both animal and plant cells, however vacuoles are only present in plant cells. Also peroxisomes and vacuoles have very different shapes and structures and this is because of their huge differences in function. While peroxisomes are the locations of oxidative reactions (necessary for converting highly corrosive hydrogen peroxide to oxygen and water), whereas vacuoles are necessary for the storage of many different compounds such as: water, ions, proteins, pigments, noxious substances, chlorophyll, etc. 8. A transport vesicle is a vesicle organelle that has the purpose of transporting proteins and other substances across the membrane. 9. The 3 main components of the cytoskeleton are: microfilaments, intermediate filaments and microtubules. The types of protein subunits that make up the microfilaments are called actin filaments (strands of actin molecules intertwined), the subunits for intermediate filaments are keratin and the subunits for microtubules are alpha and beta tubulin. 10. The main functions of actin molecules are the maintenance of the cell shape, cell motility (amoeboid movement), cell division (cytokinesis), cytoplasmic streaming and organelle movement. The main functions of microtubules are maintaining cell motility, the movement of the chromosomes during cell division (mitosis), maintenance of cell shape and organelle movement. 11. The way that protein conformational change, the use of ATP and “walking” or “sliding” of microtubule doublets are interrelated by the purpose that the combination of all these things complete. The “walking” or “sliding” of microtubule doublets requires ATP to occur and the protein conformational change is needed for the attachment and release (feet moving along the track) in response to the gain or loss of a phosphate group. 12. The arr
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