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GAMSAT Biology > The Cell > Flashcards

Flashcards in The Cell Deck (20):
1

Cell theory principles

1. All organisms are composed of one or more cells. Life processes occur in these cells.
2. Cells are the basic units of organisation in all organisms.
3. A cell can arise only by division of a previously existing cell.

2

Light microscopes operate using ____ light

visible

3

Light microscopes are able to resolve structures that are at least ____ apart

200 nm

4

Transmission electron microscopes resolve images ____ apart

0.2nm

5

Principles of scanning electron microscopes

Electrons are beamed on the surface of the specimen and reflected back. Other electrons from the specimen are released from the bombardment. Electrons are then amplified and transmitted to a screen to produce a 3D image.

6

The DNA within prokaryotes is and found in a region called

circular; the nucleoid

7

The double membrane surrounding the nucleus of eukaryotic cells is called

the nuclear envelope

8

Types of proteins in the plasma membrane

1. Transport proteins - help ions and molecules move across the phospholipid bilayer
2. Receptor proteins

9

Two main domains of prokaryotes

Bacteria and archaea

10

Bacterial cell walls are composed of

peptidoglycan

11

Function of the bacterial cell wall

Maintains shape of cell, protects the cell and prevents excessive loss or uptake of water.

12

Nucleolus

Region within the nucleus where synthesis of rRNA takes place

13

Nucleosome is composed of

DNA wrapped around histone proteins

14

Eukaryotic cells have an internal protein scaffold called

the cytoskeleton

15

T/F: Animal, fungi and plant cells possess a cell wall.

False, only fungi and plant cells possess a cell wall.

16

Chloroplasts capture light energy via thylakoid membranes arranged in stacks called the

grana

17

Long-branching, filamentous structures of fungi

Hyphae

18

T/F: Fungi can reproduce sexually or asexually.

True

19

T/F: Fungi can be unicellular or multicellular

True

20

The genetic material of a virus is found in

the capsid (protein coat)