SmarterEd

Aussie Maths & Science Teachers: Save your time with SmarterEd

BIOLOGY, M7 2019 VCE 20 MC

The diagram below shows the process of phagocytosis. This process is vital for immunity against extracellular infections.

What is happening at position 3 ?

  1. Enzymes that break down the microorganism are released into the vesicle.
  2. Antibodies are added to the vesicle to kill the microorganism.
  3. The cell is sampling the vesicle for antigen presentation.
  4. Intracellular microbes are attacking the microorganism.
Show Answers Only

\(A\)

Show Worked Solution

→ When the phagosome and lysosome fuse, they form a phagolysosome (vesicle), an acidic and oxidising environment that can effectively kill and degrade the ingested microorganism.

\(\Rightarrow A\)

BIOLOGY, M7 2020 VCE 18*

Some human cells produce proteins called cytokines.

Describe the major function of cytokines.   (2 marks)

Show Answers Only

→ The major function of cytokines is to regulate the immune response.

→ Cytokines do this by signalling between cells, which helps coordinate the body’s defense against infections and inflammation.

Show Worked Solution

→ The major function of cytokines is to regulate the immune response.

→ Cytokines do this by signalling between cells, which helps coordinate the body’s defense against infections and inflammation.

BIOLOGY, M7 2021 VCE 15 MC

Neutrophils

  1. secrete complement proteins
  2. migrate to the site of infection and engulf invading pathogens.
  3. increase the diameter of blood vessels to make them more permeable.
  4. release histamine following the binding of the antigen to receptors on the neutrophil's surface.
Show Answers Only

\(B\)

Show Worked Solution

→ Neutrophils use phagocytosis to engulf and destroy invading pathogens, such as bacteria, fungi, and other microorganisms.

→ They recognise and bind to pathogens, then internalize and digest them using various antimicrobial mechanisms.

\(\Rightarrow B\)

BIOLOGY, M7 2023 HSC 22a

Describe how phagocytes help protect against pathogens.  (2 marks)

Show Answers Only

→ Phagocytes are white blood cells which can identify and engulf foreign material.

→ Upon detection of foreign material, phagocytes can engulf them forming a vesicle which fuses with a lysosome and allows them to be digested.

Show Worked Solution

→ Phagocytes are white blood cells which identify and engulf foreign material.

→ Upon detection of foreign material, phagocytes can engulf them forming a vesicle which fuses with a lysosome and allows them to be digested.

BIOLOGY, M7 2023 HSC 8 MC

Neutrophils and T-cells are cells of the human immune system. After an infection, the concentration of these types of cells in infected tissue was plotted as a function of time.
 

Based on the data provided, neutrophils are part of which human immune system?

  1. Acquired
  2. Adaptive
  3. Innate
  4. Primary
Show Answers Only

\(C\)

Show Worked Solution

→ The relatively quick spike in neutrophil concentration when compared to the T-cells (which are part of the specific immune response) would indicate they are part of the innate/non-specific immune response.

\(\Rightarrow C\)

BIOLOGY, M7 EQ-Bank 5 MC

When a foreign body breaches the first line of defence the mast cells produce histamines in response.

What is the role of histamines in the defence of the body?

  1. To attack the invading pathogen
  2. To activate B and T lymphocytes of the specific immune response
  3. To activate the inflammation response and increase blood flow to the affected area
  4. To retain information on a pathogen's antigen so that the immune system can respond quickly to any subsequent infection
Show Answers Only

`=>C`

Show Worked Solution

→ Histamines are the chemicals released by a mast cell in response to tissue damage.

→ They increase blood flow by dilating blood vessels and increasing permeability of capillaries.

`=>C`

BIOLOGY, M7 EQ-Bank 2 MC

The runny nose and coughing that is symptomatic of having a cold is an example of the body's response to a pathogen.

How does this response protect the body?

  1. By heating the body to try to kill the virus
  2. By trying to spread the virus to other people
  3. By preventing the virus from entering the body
  4. By attempting to rapidly expel the virus from the airways
Show Answers Only

`D`

Show Worked Solution

→ These symptoms are the body’s response to many illnesses and are methods to remove the virus from airways.

`=>D`

BIOLOGY, M7 2014 HSC 21

  1. The diagram shows a process that is a part of the immune response.
     

  1. What is the name of the process?   (1 mark)

  2. Outline how inflammation contributes to the immune response.   (2 marks)

Show Answers Only

“

Show Worked Solution

a.   Phagocytosis

→ The black circle represents foreign material such as microbes or toxins, while the outlined circular shape represents a phagocyte engulfing it.
  

b.   Answers can include

→ Inflammation increases blood flow, meaning more antibodies and white blood cells can reach the site faster.

→ The swelling confines the infection to a smaller area, allowing white blood cells and antibodies to eliminate it faster, using less resources.

→ The release of histamines and prostaglandins increases permeability of blood vessels, enabling more phagocytes to pass through to the infection site.

BIOLOGY, M7 2017 HSC 4 MC

What is the role of lymphocytes in the body?

  1. They fight infection.
  2. They initiate blood clotting.
  3. They transport oxygen around the body.
  4. They transport carbon dioxide around the body.
Show Answers Only

`A`

Show Worked Solution

→ Lymphocytes (B and T cells) protect the body from pathogens by coordinating the immune response.

`=>A`

BIOLOGY, M7 2018 HSC 3 MC

Which defence adaptation in the table is correctly matched with one of its features?
 

Show Answers Only

`D`

Show Worked Solution

→ In some cases, such as in response to leprosy or tuberculosis, the body seals off a pathogen by forming a granuloma, a collection of cells containing macrophages, lymphocytes then fibroblasts (a structural cell involved in connective tissue), which forms a tough outer wall.

`=>D`


♦ Mean mark 45%.

BIOLOGY, M7 2019 HSC 5 MC

Which of the following is part of the innate immune response?

  1. Antibodies
  2. Phagocytes
  3. Stomach acid
  4. B lymphocytes
Show Answers Only

`B`

Show Worked Solution

By Elimination

→ Antibodies and B lymphocytes are specific to a pathogen and form part of the specific immune response (eliminate A and D).

→ Stomach acid is non-specific but is a barrier and always active, it is not a response (eliminate C).

→ Phagocytes engulf pathogens by phagocytosis, a process which is non-specific (innate).

`=>B`


♦♦ Mean mark 48%.