1.peroxisome is responsible for: protein syntesis storage of DNA producing new l

Question

1.peroxisome is responsible for:

protein syntesis
storage of DNA
producing new lysosomes
ridding the cell of peroxides

2.Which of the following can move through a cell membrane viasimple diffusion

amino acids
oxygen
carbon dioxide
all of these

3.Which of the following cell types should contain a high densityof mitochondria??
neurons
skeletal muscle
cardiac muscle
all of above

4. Which of the following mode of movement involves pushing an ionagainst a concentration gradient?
pinocytosis
facilitated diffusion
active transport
all of above

Explanation / Answer

1.peroxisome is responsible for: protein syntesis (This is ribosomes) storage of DNA (This is the nucleus) producing new lysosomes (This is the Golgiapparatus) ridding the cell of peroxides 2H2O + O2.Peroxisomes also catalyse the breakdown of fatty acids. 2.Which of the following can move through a cell membrane viasimple diffusion amino acids - usually moves by facilitated diffusion, but I thinksimple diffusion occurs as well oxygen - can move by simple diffusion carbon dioxide - can move by simple diffusion all of these - even if you're not sure about the'amino acids' option, you should know that O2 andCO2, being small and hydrophobic, both move by simplediffusion, so this must be the correct answer. 3.Which of the following cell types should contain a high densityof mitochondria?? neurons skeletal muscle cardiac muscle all of above - mitrochondria are responsible forATP (= energy) production, so all cell types that require a lot ofenergy will have lots of mitochondria. Cardiac (heart) muscles andskeletal muscle are the most obvious. Neurons also require lots ofenergy becaue they have loooong axons/dendrons, so require energyto supply them with nutrients/molecules. 4. Which of the following mode of movement involves pushing an ionagainst a concentration gradient? pinocytosis - This is a form of endocytosis, where the cell'drinks' a section of the surrounding fluid. It is non-specific forany particular type of substrate, so it can be against aconcentration gradient. facilitated diffusion - This is against a concentration gradient,where a transport protein (e.g. protein channel or carrier protein)aids the movement of a particle across the cell membrane active transport - The classical example of transport against agradient. This is why the process requires energy (ATP) all of above

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