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Dentistry Biological Science > Cells 1 > Flashcards

Flashcards in Cells 1 Deck (23)
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1
Q

What are the two components of the nucleus?

What does each part do?

A

Chromatin and Nucleolus

The chromatin contains DNA in the form of transcriptionally active ribosome genes. It is the site for rRNA synthesis.

The nucleolus is for ribosome synthesis.

2
Q

What is the role of the mitochondria?

A

To generate the chemical energy necessary for biochemical reactions which take place in the cytoplasm.

3
Q

What arrays are endoplasmic reticulum in?

A

Parallel

4
Q

What are some functions of the smooth ER?

A
  • Detoxification and conjugation of noxious substances
  • Lipid and steroid metabolism
  • Glycogen metabolism
  • Membrane formation
5
Q

What cells contain a lot of smooth ER?

A

Liver cells

6
Q

What are the two roles associated with rough ER

A

Protein synthesis and glycoprotein formation

7
Q

What is the main role of the Golgi apparatus?

A

To receive newly synthesised protein from the rER and sorting and packaging them to the final destination.

8
Q

What is the main role of hydrolytic enzymes?

A

It acts as a digestive system by decomposing substances taken into the cell and disposing of damaged cell organelles.

9
Q

What does glycogen look like under a microscope?

A

Black granules

10
Q

What happens to the nucleus in a fat cell?

A

The nucleus gets pushed to the side of the cell

11
Q

How much of the cell can triglycerides occupy?

A

90%

12
Q

What are the diameters of:

  1. Microfilament
  2. Microtubules
  3. Intermediate Fibres
A
1 = 7nm
2 = 25nm
3 = 10nm
13
Q

Explain the structure of a microfilament?

A

They are strands of the protein called actin. G actin monomers are wound into a strand.

14
Q

What is the length of a microvilli?

A

1 micrometer in length

15
Q

What are present inside of the villi and why?

A

Actin filaments to maintain the finger like projections by forming a core running through each villus and is anchored to the actin cortex of the cell.

16
Q

What is the role of cilia?

A

To move fluid over the surface of the cell

17
Q

What is the arrangement of the cilia?

A

9+2 arrangement of microtubules. A ring of 9 doubles around a pair of central microtubules.

18
Q

What do centrioles polymerise to form?

A

Mitotic spindle

19
Q

What does a lot of rough ER indicate in a cell?

A

That the cell produces a lot of protein

20
Q

Give an example of a cell which produces a lot of rough ER

A

Plasma cells as they produce antibodies.

Nerve cells as protein is needed to maintain cell function.

21
Q

What are the roles of microtubules and microfilaments in a nerve cell?

A

Microtubules allow communication between the cell body and its processes. Microfilaments helps to keep shape of the cells.

22
Q

Why are muscle cells multinucleate?

A

They are formed from the fusion of several cells in an embryo.

23
Q

What are the names and functions of the 4 main tissues?

A
1 = epithelial - covers exposed surfaces and lines internal passageways 
2 = connective - fills internal spaces and provides structural support, stores energy 
3 = muscle - contracts to produce active movement 
4 = neural - conducts electrical impulses and carries information

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