3.2.1.1 Eukaryotic Cells Flashcards

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1
Q

What is the structure of the nucleus?

A

Contains hereditary material
Nuclear envelope: double membrane, outer membrane is continuous with the ER, controls the entry and exit of material
Nuclear pores: allows the passage of large molecules out of the cell
Nucleoplasm
Chromosomes: protein bound DNA
Nucleolus: makes ribosomal RNA, assembles ribosomes
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2
Q

Mitochondria?

A

Double membrane which controls the entry and exit of material
Cristae: extensions of the inner membrane, large surface area for respiration
Matrix: contains all the substances needed for respiration
Creates ATP
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3
Q

What are chloroplasts?

A

The organelle which carries out photosynthesis

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4
Q

What is the structure of chloroplasts?

A

Chloroplast envelope: double membrane, controls the entry and exit of material
Grana: stacks of thylakoids
Thylakoids: contains chlorophyll, some have extensions between adjacent grana
Stroma: fluid filled matrix, possesses all the enzymes needed for photosynthesis
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5
Q

How are chloroplasts adapted for photosynthesis?

A

Granal membranes provide a large surface area
Fluid possesses all the enzymes needed for sugar production
Contain both DNA and ribosomes to manufacture the proteins needed for photosynthesis

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6
Q

What is the Golgi apparatus?

A
Flattened sacs or cisternae
Vesicles bring material from the ER
Processes and packages material
Produces secretory enzymes
Transports, modifies and stores lipids
Forms lysosomes
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7
Q

What are ribosomes?

A

Two subunits
Contains RNA and protein
Site of protein synthesis
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8
Q

What is the difference between ribosomes in eukaryotic and prokaryotic cells?

A

80S: eukaryotic
70S: prokaryotic, found in mitochondria and chloroplasts

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9
Q

What is the smooth endoplasmic reticulum?

A

Lacks ribosomes

Synthesises, stores and transports lipids and carbohydrates

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10
Q

What is rough endoplasmic reticulum?

A

Has ribosomes present on the outer surface of the membrane

Large surface area for the synthesis of proteins

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11
Q

What are lysosomes?

A

Hydrolyses material ingested by phagocytes
Exocytosis to destroy material
Digests worn out organelles
Autolysis
Contains lysozymes which hydrolyse cell walls

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12
Q

What is the cell wall?

A

Found in all plant cells
Consists of microfibrils of cellulose
Middle lamella marks the boundary between cell walls
Stops the cell bursting under osmotic pressure
Strengthens the plant cell
Allows the movement of water

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13
Q

What is a cell vacuole?

A

Fluid filled sac
Single membrane called a tonoplast
Contains pigments to attract pollinating insects
Temporary food store

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14
Q

What is a tissue?

A

A group of similar cells that perform a specific function

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15
Q

What is epithelial tissue?

A

It consists of sheets of cells
It lines the surface of organs
Most have a protectors or secretory function

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16
Q

What is xylem tissue?

A

Found in plants
Used to transport water and mineral ions through the plant
Gives mechanical support

17
Q

What is an organ?

A

A structure composing of two or more tissues which undergo one major function

18
Q

What is an organ system?

A

A group of organs working together to perform a particular function

19
Q

What is connective tissue?

A

The supporting tissue of the body

It binds structures together to provide support and protection against damage/infection/heat loss