cell structure Flashcards
What are the 2 lenses that a compound light microscope have?
objective lens
eyepiece lens
How does a Transmission electron microscope work?
-A beam of electrons is transmitted through a specimen to produce an image.
What is the best resolution for a TEM?
0.5nm
How does a scanning electron microscope work?
Beam of electron is sent across the surface of the specimen and reflected electrons are collected.
What contains the genetic information of DNA molecules?
Nucleus
What does the nucleus control?
Metabolic activities
What is the area within the nucleus responsible for producing ribosomes called?
Nucleolus
What is the Cristae?
highly folded inner membrane of the mitochondria
What are vesicles?
Membranous sacs that have storage and transport roles
what is the function of lysosomes
they contain hydrologic enzymes to break down waste in the cell
What are the 3 components of the cytoskelten?
- microfilaments
- mircotubles
- intermediate fibres
What are the microfilaments responsible for?
cell movement and cell contraction
What are spindal fibres made from?
Microtubles
what are intermediate fibres responsible for?
mechanical strength
What do 2 associated centrioles form?
centrosome
What is the function of flagella?
cell motility and sensory organelles
What organelles are involved in protein synthesis?
smooth ER
Rough ER
what is SER responsible for?
lipid and carbohydrate synthesis and storage
What is located on the outside of the RER
ribosomes
What is RER responsible for?
Synthesis and transport of proteins
Are ribosomes surrounded by a membrane?
no
What are ribosomes the site of ?
Protein synthesis
What is the Golgi apparatus made from?
cisternae
What is the role of the Golgi apparatus?
modifying and packaging proteins into vesicles
Cellulose cell wall is freely…
permeable
What are vacuoles?
membrane lined sacs in the cytoplasm
What maintains that turgor of a plant cell?
Vacuole
What is the membrane of a vacuoles called
Tonoplast
What is the fluid called in the chloroplast?
stroma
What are the internal networks of membranes in the chloroplasts called?
Thylakiods
What are several Thylakiods stacked together called?
Granum
