Practice question mistakes
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)
Give one way that an image produced by a LSC microscope differs from an electron microscope [1]
• lower res • fluorescent tag • movement • diff layers
Explain how to measure the diameter of the nucleus of one of the cells when observing thru a LIGHT microscope [4]
• use eyepiece graticule • calibrate graticule, using stage micrometer (calc length of 1 epu) • measure the diameter of nucleus in epu • take repeat measurements & calc a mean diameter in epu • multiply epu by calibration factor to calc diameter
3 improvements to dry mount and explain why they increase validity [6]
• sharp blade (so slide is thin enough & individual cells are visible) • wet mount (prevents dehydration/distortion of cells) • squash slide (easier to see individual cells)
Describe how the student could use the temporary mounts to determine the mean number of chloroplasts in the leaf cells [3]
• select large number of cells OR select cells at random • count the total number of chloroplasts in those cells • divide the number of chloroplasts by the number of cells counted
What is the animal cell organelle that contains 70S ribosomes [1]
mitochondria
Describe why ATP is the universal energy currency [3]
why it is universal: Used in all organisms why it is energy: Releases energy in small quantities why is it currency: coupled w/ energy requiring activities
Describe the roles of the cytoskeleton [3]
• cell support • movement of cilia/flagella • changing cell shape eg muscle contraction • organelle movement/holding in place • movement of chromosomes