Question

1. With respect to animal tissues, the process that stops normal, nonmalignant cells from growing without control is called _______ .

A) Conidia

B) Lysogeny

C) Contact Inhibition

D) Oncocercariosis

2. Which of the following would NOT be a manifestation of a viral attack on cells?

A) Cells going into apoptosis

B) Cell transformation

C) Cell lysis

D) Cell clumping

3. What is the role of protooncogenes in theories of how viruses cause cancer?

A) They play a role in the control of cell division

B) They make cells more susceptible to infection by cancer-causing viruses

C) They cause cancer viruses to replicate faster

D) They prevent cancer-causing viruses from leaving the cell

4. All of the following are characteristics of viruses EXCEPT:

A) They are smaller than prokaryotic cells

B) They pass through filters that will retain bacteria

C) They are composed only of genetic material

D) They are obligatory parasites

Answer 1

1) In the normal cell growth is inhibited after making contact with the neighbouring cell so this is a property of normal cell.Tumour cell migrate and form multilayer patterns.C)

2)The cell clumping is not a manifestation of virus affected cell.When a cell is infected by a virus there is apoptosis of the cell to prevent the virus transmission to the neighbouring cell.The cell is lysed also.The virus infection causes the cell to become transformed and make it into a virus producing factory in case of bacteriphage lytic cycle.D)

3)They have a role in regulating the cell division when they are converted into oncogenes due to mutation then there is cancerous growth,A)

4)The viruses consist of genetic material and also the protein coat surrounding the genetic material.So the right answer is C)