Chapter 1 Cells- Prokaryotic Cells Flashcards Preview

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Flashcards in Chapter 1 Cells- Prokaryotic Cells Deck (17):
0

Draw and label a prokaryotic cell

Do it martha.

1

Definition of cell wall?

Rigid outer layer made of peptidoglycan--> maintains shape and protects cell from damage or bursting

2

What does cell/plasma membrane definition?

Semi-permeable barrier that controls the entry and exit of substances

3

Definition of cytoplasm?

Fluid component which contains the enzymes needed for all metabolic reactions

4

Definition of nucleoid ?

Region of cytoplasm which contains genophore (prokaryotic DNA)

5

Definition of plasmid:

Additional DNA molecule that exist and replicate indepentally of the genophore l- it can be transmitted between bacterial species

6

Definition of ribosomes?

Complexes of RNA and protein that responsible for polypeptide syntheses

7

Definition of slime capsule?

Thick polysaccharide layer used for protection against drying out and phagocytosis

8

Definition of flagella?

Long, slender projection containing a motor protection which spins the flagella like a propellor enabling movement

9

Definition pilli? And the 2 types?

Hair like extensions: 2 types:
1) attachment pili: shorter in length allow bacteria to adhere to one another or to available surface
2) sex pilli: longer in length, alllow the exchange of genetic material (plasmids) via a process called bacterial conjugation

10

How do bacterial cells divide

Binary fission

11

What is binary fission a form of?

Form of asexual reproduction/ cell division used by prokaryotic cells

12

What is the process of binary fission?

Circular DNA is copied in response to replication signal
- 2 DNA loops attach to membrane
- membrane elongates and pinches off (cytokinesis) forming 2 separate cells

13

Electron microscopes have a much higher resolution than what?

Light microscopes

14

What's resolution?

Making separate parts of an object distinguishable by eye

15

How many times greater is the resolution on an electron microscope than a light one?

200 time greater

16

Prokaryotes have simple cell structures without what?

Compartments

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