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Flashcards in Cell Ultrastructure Deck (16)
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Define limit of resolution

Minimum distance at which two objects can be distinguished

1

Why do electron microscopes have finer resolution?

Limit of resolution is proportional to wavelength

2

Describe cell membrane

Phospholipid bilayer, freely mobile proteins, some glycosolated
Allows intercellular adhesion and recognition, signal transduction, compartmentalaisation, selective premeability, transport

3

Describe nucleus

Contains dna, rna, nucleoproteins

4

Describe glycocalyx

Used for cell recognition, communication snd adhesion

5

Describe plasmolemma

Protective layer
Signal transduction
Intercellular recognition

6

Describe Nucleolus

Electron dense structure within the nucleus, site of rna synthesis

7

Describe nuclear envolope

Double layer membrane with nuclear pores

8

Describe SER

Site of Lipid biosynthesis and intracellular transport

9

describe RER

Studded with ribosomes for protein synthesis

10

Describe ribosomes

Free - protein supynthesis for cytosol
On rer - synthesise proteins for cell exterior

11

Function of golgi?

Sort, concentrate, package and modify proteins synthesised by rer

12

Describe lysosomes

Comtain acid hydrolases so have glycosylated membrane for protection
Highly diverse shape
Generated by golgi

13

What are residual bodies

Lysosomes that contain some indigestible remenants

14

Describe peroxisomes

Roughly spherical, contain granular matrix bound by single membrane
Major sites of oxygen utilaisation and h202 production
Catalase uses h202 to oxidise phenols, formic acid and alcohol

15

Describe mitochondria

Generate atp rich molecules
Use glucose and fatty acids
Lots in liver and muscle
Inner matrix contains enzymes for krebs cycle and fatty acid chcles, dna,rna ribosomes and calcium granules