Lesson 2

Question 1

Which type of parasitic the virus are?

Answer 1

intracellular parasites

Question 2

What are the virus shapes?

Answer 2

polyhedral متعدد الاسطح
spherical كروي
complex كارتون
helicl لولبي

Question 3

Viruses structure :-

Answer 3

envelp (membrane) not for all
Nucleic acid ( ssDNA,dsDNA,ssRNA,dsDNA)
Capsid (protin)
spikes (target specific cells) not for all

Question 4

how does virus replication occurs?

Answer 4

RNA virus (-) :- inside the cells transforms form vRNA into mRNA and use tRNA (transcription) 
RNA virus (+) :- inside the cells use tRNA (transcription) 
DNA virus :- in inside the nucleus, using nucleus enzymes (translation and transcription)

Question 5

what is the different between Enveloped and Non-Enveloped Viruses

Answer 5

Enveloped
more sensitive to heat, dryness and PH
hard target for immune system (because they use the cell membrane in replication)
Exocytosis without lysis

Non-Enveloped
Exocytosis by lysis (Stimulates the immune system)
Easy target for immune system

Question 6

what is the different between + RNA and - RNA?

Answer 6

+ RNA = mRNA

- RNA must be transfers into mRNA firstly

Question 7

lytic and lysogenic cycle ?

Answer 7

lytic :- kills the bacteria
lysogenic :- DNA fuse and make a new bacteria and when it replicate it make the same new bacteria , after a while the DNA split and the BACTERIOPHAGES release again

Question 8

What is the structure of bacteria?

Answer 8

Cell wall
Plasma membrane (cell membrane) + or -
Cytoplasm
Nucleus tides (dsDNA) and plasmid
Ribosomes
Capsule
Flagellum / flagella
Pilus / pili
Mesosma :- invagination of membrane (ATP)

Question 8

What is the the difference between germ + and - in bacteria?

Answer 8

Garm +
Internal layer of phospholipid
Thicker protein layer
Purple / blue color

Germ -
Internal and external layers of phospholipid
Thinner protein layer
Red / pink color