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Cellbiology part 1 > Cell theory > Flashcards

Cell theory Flashcards

1
Q

Name a few of the Nucleus functions

A

Site of DNA replication, majority of DNA is held, site of gene transcription

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2
Q

Large macromolecules (ex proteins) imported from the cytoplasm needs a …. to be able to pass into the nucleus.

A

special signal

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3
Q

What is Chromatin?

A

DNA combined with protein that creates a fibrous complex

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4
Q

What is Chromosomes?

A

Chromatin exists in long thin threads which are called chromosomes

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5
Q

What are the two different endoplasmic reticulums?

A

Rough endoplasmic reticulum (RER)
Smooth endoplasmic reticulum (SER)

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6
Q

Where is newly synthesised proteins transported?

A

Into RER lumen

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7
Q

What are the 4 functions of ribosomes?

A
  1. Chemical modification of small molecules taken into the cell that might be toxic
  2. Site for glycogen degradation in animal cell
  3. Site for lipid & steroid synthesis
  4. Calcium storage
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8
Q

In which cells do you find 70S ribosomes?

A

plant cells

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9
Q

The Golgi apparatus often contains two components, which?

A

Cisternae & small membrane-enclosed vesicles

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10
Q

What are the Golgi apparatus functions?

A
  1. Receives protein-containing vesicles from RER
  2. Modifies, concentrates, packages and sorts proteins —> transport to cellular or extracellular destinations
  3. Adds carbohydrates to proteins & modifies carbohydrates attached to proteins from RER
  4. Synthesizes some polysaccharides for plant cell wall
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11
Q

The Cistenae has three functionally regions, what are they called?

A

Cis-region, Trans-region & Medial-region

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12
Q

What is the Mitochondria usually called?

A

The energy producer

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13
Q

What can you find in the mitochondria matrix?

A

Enzymes, DNA & ribosomes

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14
Q

What is the function of the Peroxisomes?

A

Accumulate toxic peroxides resulting from other cellular activities and safety degrade them

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15
Q

What is the function of the cytoskeleton?

A
  1. Support the cell and maintain its shape
  2. Hold organelles in position within the cell
  3. Move organelles around within the cell
  4. Involved in the movements of the cytoplasm
  5. interacts with extracellular structures
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16
Q

The cytoskeleton contains of three components, describe these.

A
  1. Microfilaments - consists of actin monomers bundled together
  2. Intermediate filaments - consists of fibrous proteins organised in tough, rope-like structures. Two major functions; anchor cell structures in place & resist tension.
  3. Microtubules - long, hollow, unbranched cylinders.
    Two major functions: form a rigid internal skeleton for some cells & act as a framework which motor proteins can move structures within cell
17
Q

In what cells can you find lysosomes?

A

animal cells

18
Q

Lysosomes contain digestive enzymes. What do they do?

A

They degrade proteins, polysaccharides, nucleic acids & lipids

19
Q

In what cells can you find Vacoules?

A

In plant cells

20
Q

The Vacuole has 6 functions, which are they?

A
  1. Storage (sugars, ions, organic acids)
  2. Digestion
  3. pH & ionic homeostasis: controls uptake and release of protons (H+) & ions to control the cytosol and activity of cytosolic enzymes
  4. Defence: accumulate toxic compounds to discourage insect and animal herbivores & to kill the pathogenic microbes
  5. Protected from toxic compounds: some crops (ex Hemp) used to absorb heavy metals, concentrates in the vacuole
  6. Pigmentation: contain different anthocyanin (attract pollinators and seed dispersers), screen out harmful UV & high light
21
Q

What is Cellulose?

A

Repeating monomers of glucose (beta 1.4 glycosidic linkage)

22
Q

In plant cells you find cell walls. These walls consists of primary & secondary cell wall. Describe these.

A

Primary cell wall - consists of cellulose fibrils joined by polysaccharides and structural proteins
Secondary cell wall (mostly in trees) - strengthening function (lignin), help in water transport (xylem cells)

23
Q

Plant cells are connected by narrow channels, what are they called?

A

Plasmodesmata

24
Q

What is the function of the plasmodesmata?

A

Provide a pathway for the transport of different substances –> sugars, amino acids, hormones etc.

25
Q

What is an glyxosome and where do you find it?

A

Glyxosomes exists in plant cells (similar to peroxisomes) and their main function is to convert stored lipids to carbohydrates for transport to growing cells

Cellbiology part 1 (10 decks)

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