cell structure and microscopy
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (7 张)
why will there be a faster rate of plasmid replication n a culture of high conc of amino acids? (2)
-amino acids used in protein synthesis -so more enzymes for replication
describe how a sample of chloroplasts can be isolated from the leaves. (4)
-break open cell and filter -add to cold, buffered, isotonic solution -centrifuge and remove nuclei -spin at higher speed and remove chloroplast
outline the role of organelles in the production, transport and release of proteins from eukaryotic cells. (4)
-DNA in the nucleus codes for proteins -ribosomes produce proteins - mitochondria makes ATP for protein synthesis - golgi body modifies proteins
give two advantages of TEM microscopes compared to SEM (2)
-higher resolution -view internal structures
contrast how an electron microscope and light microscope works (2)
uses electrons|uses light higher resolution so can see smaller organelles |lower resolution
contrast an electron microscope with a light microscope (3)
dead specimens|live specimens black and white|colour electron needs thinner specimens
how can you prepare to observe starch grains in a plant cell using a light microscope? (4)
• add drop of water to slide -obtain thin section and place on water drop • add iodine in potassium iodide -low cover slip using mounted needle