1) to regulate movement of substances into and out of the cell 2)to respond to chemicals like hormones.
1 of 23
Describe the function of the nucleus.
Controls the cells activities by controlling the transcription of DNA.
2 of 23
Give 1 function of a lysosome.
Digest invading cells, break down worn out components of a cell
3 of 23
What is the function of the smooth endoplasmic reticulum?
Synthesises and processes lipids.
4 of 23
Explain the difference between a tissue and an organ.
Tissue- where similar cells are grouped together Organ-where different cells are grouped together to perform a particular function.
5 of 23
What is an organ system?
Where different organs work together to carry out a particular function.
6 of 23
What is a capsid?
The protein coat that surrounds the genetic material of a virus.
7 of 23
Formula for calculating magnification.
Magnification= size of image/ actual size
8 of 23
What is the difference between magnification and resolution?
Magnification= how much bigger the image is compared to the specimen Resolution=how well the microscope can distinguish between 2 points that are close together.
9 of 23
How do transmission electron microscopes (TEMs) work?
Use electromagnets to focus a beam of electrons, which is then transmitted through the specimen.
10 of 23
How do scanning electron microscopes (SEMs) work?
They scan a beam of electrons across the specimen.
11 of 23
Give one advantage and one disadvantage of TEMs.
Advantage= Gives high resolution images Disadvantage=Can only be used on non-living specimens.
12 of 23
Give one advantage of SEMs over TEMs.
SEMs can be used on thick specimens and TEMs cannot. SEMs can produce 3D images whereas TEMs cannot.
13 of 23
What is a temporary mount microscope slide?
A prepared microscope slide in which the specimen has been suspended in a drop of liquid.
14 of 23
What is a microscope artefact?
Something you can see down the microscope that is not part of the cell or specimen you are looking at.
15 of 23
Give 2 ways in which homogenisation for cell fractionation is done.
1) vibrating the cells 2) grinding the cells up in a blender.
16 of 23
What is the cell cycle?
The process that all body cells from multi cellular organisms use to grow and divide.
17 of 23
Why is mitosis needed?
For growth and for repairing damaged tissues.
18 of 23
In what stage of the cell cycle does DNA unravel?
Interphase.
19 of 23
What happens during prophase?
The chromosomes condense and become shorter and fatter.
20 of 23
What happens during telophase?
The chromatids reach opposite poles on the spindle. They uncoil and become long and thin again.
21 of 23
What is cytokenesis?
Division of the cell cytoplasm.
22 of 23
What is cancer?
A tumour that invades surrounding tissues.
23 of 23
Other cards in this set
Card 2
Front
Describe the function of the nucleus.
Back
Controls the cells activities by controlling the transcription of DNA.
Card 3
Front
Give 1 function of a lysosome.
Back
Card 4
Front
What is the function of the smooth endoplasmic reticulum?
Back
Card 5
Front
Explain the difference between a tissue and an organ.
Comments
No comments have yet been made