3.2.4.5 - Monoclonal Antibodies Flashcards Preview

SHHS - Science - NEW AQA A-Level Biology (Year 1) > 3.2.4.5 - Monoclonal Antibodies > Flashcards

Flashcards in 3.2.4.5 - Monoclonal Antibodies Deck (21):
1

What is an antibody?

A protein with a specific binding site.

Synthesised by B-lymphocytes (plasma cells)

2

Identify the missing label.

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3

Identify the missing label.

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4

Identify the missing label.

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5

Identify the missing label.

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6

Identify the missing label.

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7

Identify the missing label.

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8

How many polypeptide chains make up an antibody?

4

9

What does the antibody binding site bind to?

A complementary antigen

10

What do we call an antibody that is bound to an antigen?

An antigen-antibody complex

11

How does an antibody lead to the destruction of an antigen?

  1. They cause agglutination of bacterial cells - clumping together to make it easier for a phagocyte to locate them.
  2. They serve as markers that stimulate phagocytes to engulf the bacterial cells to which they're attached.

12

What is agglutination and how is it possible?

When an antibody binds to bacterial cells and causes them to clump together.

It is possible because antigens have 2 binding sites (see image).

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13

What is a monoclonal antibody?

An antibody produced by a single clone of cells.

14

Give some uses of momoclonal antibodies.

- targetting medication to specific cell types

- medical diagnosis

-pregnancy testing

15

Describe how monoclonal antibodies be used to treat cancer?

- produce monoclonal antibodies specific to the antigen on the cancer cell.

- give these to a patient and they will attach to the cancer cells.

- They will block the chemical signals that stimulate uncontrolled growth of cancer cells

16

What is the name given to the monoclonal antibody treatment of breast cancer?

Herceptin

17

Why are monoclonal antibodies better treaement in some cases than drugs?

Fewer side effects due to a very specific responce on target cells.

18

Radioactive or cytotoxic drugs can be attached to monoclonal antibodies. How do these kill cancer cells?

The antibody with the attached drug attaches specifically to the cancer cell, and the drug kills the cell in a very targetted way.

19

Monoclonal antibodies are used to test for HIV. What is the name of this test?

ELISA test

20

When a woman is pregnant the placenta produces a hormone called chorionic gonadatrophin (hCG) that can be found in her urine. How can these hormones be used alongside monoclonal antibodies to diagnose pregnancy?

Monoclonal antibodies are linked to coloured particles on the test strip. If hCG is present in the urine it will bind to the antibodies on the strip, and cause the complex to move along the strip where it is trappd by another antibody careating a coloured line. No hCG no attachment - no line. 

21

What are the ethical issue related to the use of monoclonal antibodies?

- Mice are used to produce both tumour cells and monoclonal antiibodies. The use of animals in medical research nad treatment is an ethical isse as welfare is in quesiton.

- Although the use of monoclonal antibiodies saves many lives, there have been some deaths associated with their use (i.e. in the treatment of MS). It is important that patients are made fully aware of any potential risks.

- Accidents in medical trials involving human volunteers in which  poeple are harmed cause a lack or truth in in industry and processes.