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- Which of the following membrane-crossing mechanisms requires energy? Active transport Facilitated diffusion Simple diffusion Passive transport TurgorWhich of the following statements applies to all three major classes of cytoskeletal polymers (microtubules, actin filaments and intermediate filaments)? They have intrinsic polarity They assemble from protein subunits synthesized on free polyribosomes They add subunits only at their ends They are involved in cell motility Their constituent proteins are tissue specific* this is a Simple squamous cell agree O disagree O Desktop acer
- Cytoplasmic streaming in plants… Question options: is the unidirectional movement of the cytoplasmic material around the central vacuole of the cell. creates a whip-like motion used for motility in organisms such as Euglena sp. is the beating back and forth of short microtubules dispersed around the cell to create motion (e.g. Paramecium sp.). pushes the cytoplasm to one end of the cell and causes the plasma membrane to extend outward as a pseudopod.A plant cell that displays a plasmolysis shape must be in which of the following solutions? hypertonic solution distilled water isotonic solution fresh water hypotonic solutionA prokaryote converts food energy into the chemical energy of ATP on/in its: chromosome. flagella. ribosomes. cell wall. plasma membrane.
- Cell motility has been described as being like the motion of tank treads. At the leading edge, actin filaments form rapidly into bundles and networks that make protrusions and move the cell forward. At the rear, cell adhesions are broken and the tail end of the cell is brought forward. What provides the traction for moving cells? How does cell-body translocation happen? How are cell adhesions released as cells move forward?which of the following best describes the gram positive (+) cell wall: O the peptidoglycan chain wraps around the cell only 1-2 times O a layer of polysacharrides and proteins ONLY has an outer membrane enclosing a thin layer of peptidoglycan O the peptidoglycan chain wraps around the cell many times O made of phospholipid bilayer onlyThe image below shows a density gradient centrifugation carried out to separate a mixture of lysosomes, peroxisomes and mitochondria Organelle mixture 60L 1.11 Centrifuge 1.15 2 1.19 1.22 1.25 Which fraction would you take to obtain mitichondria, and why? O Fraction 2 because mitochondria contain haemoglobin. giving them a reddish colour O Fraction 3 because it is the most dense fraction O It is impossible to decide without further testing O Fraction 1 because it is the least dense fraction O Fraction 2, because mitochondria contain haem, giving them a reddish colour Increasing density of sucrose (g/cm³) 3.
- When the Golgi apparatus glycosylates a protein with the mannose-6-phosphate tag, this carbohydrate tag helps to protect the protein from: cell biology free radical damage in mitochondria digestion in the acid interior of lysosomes phototoxic damage in chloroplasts shearing forces along the cytoskeleton disassembly in the nucleolusA matrix composed primarily of the carbohydrate cellulose, this structure provides protection and support for plant cells. Group of answer choices Golgi apparatus Cell wall Endoplasmic reticulum membraneDynamic instability is a term that can be applied to which mature cytoskeletal polymer? Neither microfilaments nor intermediate filaments Microfilaments only Both microfilamers and intermediate filaments Intermediate filaments only