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1

What is even the smallest bacteria capable of?

independent replication, synthesis of energy and proteins, cell enclosed with DNA and RNA

2

What do viruses not have?

cell wall, cytoplasm, ribosomes/mitochondria, nucleus, independent replication

3

Does nature have RNA carrying genetic information?

NO- not found in nature

4

Will viruses contain DNA and RNA?

Not both at the same time- one or the other

5

DO RNA viruses carry genetic information?

YES

6

Can virues synthetize their own energy or proteins?

NO

7

Can viruses be seen under a microscope?

NO- too small

8

How do antibiotics affect viruses?

THey are resistant to all antibiotics

9

What did Geirer and Schraman do?

extracted the infectious nucleic acid which produced disease in the host cells confirming it as living chemicals

10

Most viruses are what shape?

spherical

11

define virons

extracellular virus particles- vary in size from 20-300nm

12

What is the biggest virus equal to?

the size of the smallest bacteria (micro plasm)

13

List shapes of viruses

spherical, complex, bullet shaped/brick shaped

14

What can viral nucleic acids be extracted with?

phenol/detergents

15

What parts make up the viral structure?

central nucleic acid, protein coat (capsid), some may have an envelop

16

What part of the virus protects the nucleic acid and is the basic structure of a virus?

capsid- facilitates absorption

17

What is the envelop of the cell made up of?

envelop is a lipid layer derived from host cell during budding

18

Are viruses heat labile?

YES

19

At what temperature are viruses inactivated within a few seconds?

56 degrees celcius

20

What inactivates viruses?

sunlight, UV light

21

What are viruses resistant to?

chemical disinfectants- lysol for example

22

How doe viruses replicate?

disassemble into patricles inside the cell, multiply separately and then assemble- one virion giving rise to hundred of virion particles

23

Process of adsorption of a virus

virus adsorbed to host cell- there are specific receptors on host cell for viruses

24

Penetration of a virus

penetrate into the cell

25

Uncoating of a virus

stripping of virus from capsid by lysozyme of the cell

26

Process of virus attacking

absorption, penetration, uncoating, biosynthesis, maturation, release

27

Process of biosynthesis of virus

synthesis of enzymes for stages of viral replication, assembly and release. Followed by synthesis of nucleic acid and capsid protein takes place separately

28

Where does synthesis of nucleic acid take place?

nucleus

29

Where does synthesis of viral proteins occur?

cytoplasm

30

Where does RNA viruses synthesize nucleic acid and proteins?

cytoplasm