IB Bio Topic 6.3

Which factors related to mucous membranes protect the body against microbes?

• Production of lysozyme

• Secretion of alkaline solutions

• Trapping of microbes

• Producing antibodies

What name is given to the molecules that bind to foreign proteins that enter the bloodstream?

• Antigens

• Antibodies

• Antibiotics

• Allergens

Where in a cell are antigens found?

• In the nucleus

• In the cytoplasm

• In the plasma membrane

• On the surface of the Golgi apparatus

Which one of the following statements about antibodies is correct?

• Antibodies are polypeptides.

• Antibodies are produced by the bone marrow.

• Antibodies are pathogenic foreign substances.

• Antibodies kill bacteria but not viruses.

Tags

NGSS.HS-LS1-6

A blood clot forms around a network of protein.

What is the protein?

• Fibrinogen

• Fibrin

• Thrombin

• Prothrombin

What occurs during the blood clotting process?

• Prothrombin is converted into thrombin which acts on fibrinogen

• Prothrombin is converted into thrombin which acts on fibrin

• Fibrinogen is converted into fibrin which acts on prothrombin

• Fibrinogen is converted into fibrin which acts on thrombin

What is the correct sequence of factors involved in blood clotting?

• latelets → clotting factors → fibrin → fibrinogen

• clotting factors → platelets → fibrinogen → fibrin

• platelets → clotting factors → fibrinogen → fibrin

• clotting factors → platelets → fibrin → fibrinogen

How do skin and mucous membranes act as barriers to infection?

• A

• B

• C

• D

How do phagocytic leucocytes help to protect against disease?

• They secrete bacterial toxins by exocytosis

• They ingest pathogens by endocytosis

• They produce antigens to destroy pathogens

• They produce antibodies to destroy pathogens

Which is the correct sequence of events when skin is cut and bleeding occurs?

I. Thrombin is produced

II. Fibrinogen is converted into fibrin

III. Platelets release clotting factors

• I --> II --> III

• I --> III --> II

• III --> II --> I

• III --> I --> II