just check tf no explanation needed 5t f histamine is a vasodilator 6t f b cell are formed in th

5. $boxed{text{T}}$ $boxed{text{F}}$ Histamine is a vasodilator.

Just check tf no explanation needed 5t f histamine is a...

5. _____T _____F Histamine is a vasodilator. 6. _____T _____F B cells are formed in the bone marrow. 7. _____T _____F MHC molecules are found on all nucleated cells. 8. _____T _____F Antibodies kill bacteria and viruses by binding to them. 9. _____T _____F Boosters are recommended for live virus vaccines. 10. _____T _____F Virus surface features stimulate antibody production. 11. _____T _____F Deleting a virulence gene will cause a virus to be unable to cause disease. 12. _____T _____F Irradiation is one way to inactivate a virus. 13. _____T _____F There will be large clumps of antibodies/antigen if there is an abundance of antigen. 14. _____T _____F A toxoid is a modified version of the toxin from which it is derived. 15. _____T _____F Inactivated vaccines cannot revert to the original dangerous form. 16. _____T _____F The live vaccine has a better chance to stimulate memory cell production. 17. _____T _____F A toxoid vaccine also provides protection from the toxin-producing bacteria. 18. _____T _____F Subunit vaccines cannot revert back to a virulent form. 19. _____T _____F Conjugated vaccines use a protein carrier to enhance the immune response. 20. _____T _____F Droplet transmission can occur over a distance greater than 3 feet.

Transcript

00:01 Everyone in this question we need to tell whether the statements here are true or not.

00:05 So the first statement says that the histamine is a vasodilator.

00:11 So this here is a biologically active substance which acts as a vasodilator that is it dilates the blood vessels which allows the blood to flow more easily and the function of histamine is contraction of the smooth muscle bronchi.

00:30 So this here is a true statement.

00:33 Then the next question says that b cells are formed in the bone marrow.

00:40 So these here basically originate in the bone marrow and their goal is to recombinase the antigen and these b cells mature in the lymph nodes.

00:53 So this here is also true.

00:56 Then the next question says that the mhc molecules are found on all the nucleated cells.

01:07 So basically it is the mhc1 which is found on all the nucleated cells.

01:15 So this statement is also true.

01:19 Then the next question says that antibodies kill bacteria and viruses by binding to them.

01:27 Antibodies basically activate the complement system to destroy the bacterial cell by lysis but it does not kill the bacteria by themselves.

01:39 So that is why the statement here is false.

01:42 It only binds to the bacteria and let the other cell kill the bacteria.

01:48 Then the next question says that boosters are recommended for live virus vaccine.

01:53 So just one or two doses of most live vaccines can give lifetime of protection against the germ and the disease it causes.

02:03 So that is why the statement here is false.

02:07 Then the next question says that virus surface features stimulate the antibody production.

02:14 So basically there are certain lipoproteins that are present on the virus which basically activates the antibody which binds with the virus that will be the foreign particle by its variable region.

02:30 So this here is the true statement.

02:33 Then here is the sixth question.

02:35 Then the next question says that deleting a viral lens gene will cause a virus to be unable to cause the disease.

02:44 There are certain oncolytic viruses which are genetically modified in a way that their viral lens factors are weakened or deleted so they can infect and replicate in cancers but here they will not form any disease.

02:57 So this statement here is true.

03:00 Then in the next question it says that irradiation is one way to inactivate a virus.

03:07 So there are uv rays that can be used to inactivate the viruses.

03:11 So this statement here is true.

03:14 Then the next question says that there will be large clumps of the antibody antigen if there is an abundance of the antigen...

Question

Please give Ace some feedback