« previous next »

Author Question: Which of the following would be unexpected in homozygous Hb S? a. High reticulocyte count b. ... (Read 58 times)

frankwu

  • Hero Member
  • *****
  • Posts: 549
on: Jun 25, 2018
Which of the following would be unexpected in homozygous Hb S?
 
  a. High reticulocyte count
  b. Hemoglobin A (Hb A)
  c. Elevated hemoglobin F (Hb F)
  d. Hemoglobin that is less soluble

Question 2

What is the most likely causative association between malaria and sickle cell trait?
 
  a. Sickle gene makes people more prone to malaria infection.
  b. Sickle gene prevents Plasmodium ovale infection.
  c. They are both found in Asia.
  d. Sickle gene offers some protection against malaria.


samiel-sayed

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
Both b-globin genes are abnormal in homozygous Hb S. Therefore Hb A is not present unless the patient has received a red cell transfusion. Hb S is less soluble than normal Hb A, the reticulocyte count is elevated, and patients usually have a high Hb F.

Answer to Question 2

ANS: D
Sickle cell trait (heterozygosity for hemoglobin S Hb S) confers resistance against infection with Plasmodium falciparum. It is believed that this is why the abnormal hemoglobin has such high prevalence in areas where this form of malaria is endemic.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

Did you know?

Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Homozygous recessives from inbreeding Homozygous recessives from inbreeding
From high cotransduction frequencies, close linkage is inferred From high cotransduction frequencies, close linkage is inferred
Overview of a computer-controlled high-pressure common rail V-8 diesel engine. Overview of a computer-controlled high-pressure common rail V-8 diesel engine.
A high-performance aftermarket air filter often can increase airflow into the engine for more ... A high-performance aftermarket air filter often can increase airflow into the engine for more ...
Effect of dietary fats on high- and low-density cholesterol levels Effect of dietary fats on high- and low-density cholesterol levels
High school science classes are required to use deductive logic High school science classes are required to use deductive logic
Video: Burn Animation

For a complete list of videos, visit our video library