Cells Flashcards
Are human cells multicellular or unicellular?
Human cells are multicellular, and have several parts (Organelles) which make it work.
What is the function of the plasma membrane?
The plasma membrane controls the entry and exit of substances in and out of the cell.
What is the function of the cytoplasm?
The cytoplasm is a watery matrix that fills each cell and is enclosed by the cell membrane.
What is the function of the nucleus?
The nucleus controls the cell’s biochemical activities, and contains DNA in the form of chromosomes, there are 46 chromosomes in the human body.
What is the function of the mitochondria?
The mitrochrondria is the site of aerobic respiration.
What is the function of the ribosomes?
THe ribosomes are the site of protein synthesis, they may be free in the cytoplasm or bound to RER.
What is the function of the Rough Endoplasmic Reticulum (RER)?
What is the function of the Smooth Endoplasmic Reticulum (SER)?
THe SER is a system of membranes with no ribosomes, and is a site of lipid synthesis (E.g., oestrogen, and testosterone).
What is the function of Centriloles?
The centriloles are protein microtubles that help form spindle fbres which help during cell division (Mitosis and Meiosis).
What is the function of Lysosomes?
The lysosomes are vesicles that contain hydrolytic enzymes, which break down waste materials inside the cell.
What is the function of the Golgi apparatus (Golgi body)?
The Golgi apparatus modifies and packages the proteins and lipids made in the Rough and Smooth ER into vesicles.
What are the units of length?
Km (Kilometer), m (Meter), cm (centimeter), mm (Millimeter), dangly u (Micrometer), and nm (Nanometer).
How many times do you have to multiply 1 kilometer, to get to 1 meter, centimeter, millimeter, micrometer, and nanometer?
What are Light microscopes?
Light microscopes use light rays, and is cheaper than Electron microscopes. They have lower magnification (Up to x1000) and lower resoloutsion (Lower clarity of image.
What are Electron microscopes?
Electron microscopes use electrons, and are more expensive that Light microscopes. They have higher magnification (Up to x1000000) and resoloutsion (Higher clarity of image).
