Answer:
Cell membrane
Explanation:
Cell membrane controls what goes in and out of cells
Parts of the microscope are:
1. Eyepiece or ocular. This what you look through at the top of the microscope.
2. Eyepiece tube. Holds the eyepiece in place
3. Objective lens. The primary optical lenses on a microscope ranging from 4x to 100x magnification power.
4. Nosepiece. Houses the objective.
5. Coarse and fine focus knobs. They are used to focus the microscope.
6. Stage. This is a ledge where the specimen to be observed is placed.
7. Stage clips. Clips on the stage that hold e.g. a glass slide on which the specimen has been mounted.
8.Aperture. The hole in the stage through which transmitted light from the base reaches a specimen placed on the stage for observation.
9. Illuminator. This is the light source for a microscope usually located in the base of the microscope.
10. Condensor. Is used to collect and focus the light from the illuminator on to the specimen. It is located immediately under the stage.
11. Iris diaphragm. This is a flexible structure that controls the amount of light reaching the specimen and is located above the condenser and below the stage.
12. Condensor focus knob. Moves the condenser up and down to control the light focus on the specimen.
13. Base. This is the foot of the microscope and supports the whole frame of the microscope.
Answer:
Endocytosis
Explanation:
Some molecules that are required by a cell are so large that they cannot pass into a cell by either the cell membrane or by any carrier protein. These molecules are transported into the cell by the process named as endocytosis.
In this process, the cell membrane forms a vesicle, a membrane-bound sac, around the large molecule. Then, the vesicle pinches the molecule into the cytoplasm of the cell. Energy is required for this process to occur.
