Exam Questions Flashcards
Advantages of view specimen through TEM than SEM?
Higher resolution and can view internal structures
What cells wall of fungi,plant and bacteria is made out of?
Chitin
Cellulose
Peptidoglycan or murein
What has stacked membranes arranged in parallel and contains dna?
Chloroplast
What is made of polysaccharide in cells?
Cell wall
What is an organelle and is not surrounded by 2 membrane?
Golgi apparatus
2 ways RNA and DNA is different.
Dna:contains thymine and deoxyribose
RNA:ribose and uracil
When no organelle are visible in cytoplasm of Red blood cell why does it happens?
Cytoplasm is filled with haemoglobin
When cell is stained,it cause cell membrane to appear as 2 dark lines,explain why?
Membrane has phospholipids bilayer and stain bind to glycerol (tail,and the head is a phosphate group)in and out of cell
Why do human Breast milk need a high number of mitochondria and Golgi vesicles?
Mitochondria:cells need a lot of energy to carry out the energy-intensive process of milk production
Golgi Apparatus: The Golgi apparatus is involved in the modification, packaging, and transport of proteins and lipids within the cell.
Vesicles: are involved in the secretion of milk components, allowing for the controlled release of milk from the cells into the milk ducts.
Describe the one role of cells which ingest bacteria and digest them in cytoplasm?
Lysosomes fuse with vesicles and release hydrolytic enzymes(lysozymes)
Why do smaller cells have mitochondria that is distributed evenly and in larger cells most mitochondria are found close to cell membrane why does it take longer for aerobic respiration to happen in larger cells
(Use oxygen during aerobic respiration)
-Larger cells have smaller SA(less doors)to volume ratio
-so it takes longer for oxygen to diffuse in mitochondria
-Diffusion distance pathway is longer
Outline the role of organelle in production,transport and release of protein.(no transcription and translation)
DNA in nucleus has code for protein and in the RER proteins are made and mitochondria is made for the Golgi which packers the protein into vesicles in order to be transported.
Vesicles fuse out of cell membrane and release protein through exocytosis.
Determine how scientists could have use temporary mount of cell to determine the mean number of a specific organelle e.g chrloplast
Select the large number of cells/all cells in field view
Count number of chloroplast
Divide the number of chloroplast by the number of cells
How do you calculate the length of a cell with a scale present
The length of cell / scale length(ruler)
Then time by the number on top of the scale
When mitochondria is studied are extracted it is placed in a specific concentration of sucrose but why?
To prevent the mitochondria to change shape.
