Author Question: A woman is surprised to read on the Internet that certain infections can cause cancer and has sought ... (Read 68 times)

Medesa · **on:** Jun 25, 2018

A woman is surprised to read on the Internet that certain infections can cause cancer and has sought clarification from her family physician during an office visit. How can the physician best respond to the woman's query?

A)
Though it's not particularly common, it's true that certain bacteria and viruses can lead to cancer.
B)
Most cancers that cannot be attributed to family history or lifestyle are in fact associated with viruses.
C)
There are many viruses, but only a very few of them have been shown to cause cancer in humans.
D)
This is true; for example, HIV has been shown to cause cancer in some patients.

Question 2

As part of an orientation to a genetic counseling practice, a group of medical students are differentiating between autosomal recessive disorders and autosomal dominant disorders. Which of the following statements is true of autosomal recessive disorders?

A)
They can manifest when present in one or both gene pairs.
B)
There is a one in two chance of an affected child in each pregnancy with an affected mother.
C)
They tend to have a more uniform symptomatology than autosomal dominant disorders.
D)
The associated disorders are usually attributable to abnormalities in structural proteins.

trampas · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

Ans:
C

Feedback:

Four DNA viruses have been implicated in human cancers: the human papillomavirus (HPV), Epstein-Barr virus (EBV), hepatitis B virus (HBV), and human herpesvirus-8 (HHV-8). Bacteria have not been linked with cancer, and viruses do not account for a large proportion of cancer cases. HIV is associated with an increased risk of cancer caused by HHV-8, but HIV itself does not cause cancer.

Answer to Question 2

Ans:
C

Feedback:

Autosomal recessive disorders tend to have a more uniform symptomology than autosomal dominant disorders. Their incidence is dependent on both members of the gene pair being affected, and there is a one in four risk of an affected child with each pregnancy. The associated disorders are usually attributable to enzyme deficiencies.