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Doctors Medicines MCQs Q&A

With reference to stem cells, which of the following statements is/are correct? 1. They do not have any tissue-specific structure. 2. They can carry oxygen in the blood but cannot pump blood through the body like heart cells. 3. Bone marrow and Peripheral blood tissue are the sources of stem cells. Select the correct answer using the codes given below:

With reference to stem cells, which of the following statements is/are correct? 1. They do not have any tissue-specific structure. 2. They can carry oxygen in the blood but cannot pump blood through the body like heart cells. 3. Bone marrow and Peripheral blood tissue are the sources of stem cells. Select the correct answer using the codes given below: Correct Answer 1 and 3 only

The correct answer is 1 and 3 only.

Key Points

  • Stem cells are undifferentiated or partially differentiated cells in multicellular animals that can specialize in many types of cells and multiply endlessly to produce additional stem cells.
  • In a cell lineage, they are the earliest form of cell.
  • Tissue-specific stem cells (also referred to as somatic or adult stem cells) are more specialized than embryonic stem cells.
  • Typically, these stem cells can generate different cell types for the specific tissue or organ in which they live. Hence, option 1 is correct.
  • The only stem cells now used to treat disease are hematopoietic stem cells.
  • These are the blood cell-forming adult stem cells found in the bone marrow.
  • Every type of blood cell in the bone marrow starts as a stem cell.
  • Stem cells are immature cells that are able to make other blood cells that mature and function as needed. Hence, option 2 is incorrect while option 3 is correct.

Important Points

  • Stem cells are divided into 2 main forms-
    • Embryonic stem cells:
      • The embryonic stem cells used in research today come from unused embryos.
      • These result from an in vitro fertilization procedure.
      • They are donated to science.
      • These embryonic stem cells are pluripotent. This means that they can turn into more than one type of cell.
    • Adult stem cells:
      • There are 2 types of adult stem cells.
      • One type comes from fully developed tissues such as the brain, skin, and bone marrow.
      • They are more likely to generate only certain types of cells.
      • For example, a stem cell that comes from the liver will only make more liver cells.
      • The second type is induced pluripotent stem cells.
      • These are adult stem cells that have been changed in a lab to be more like embryonic stem cells.

Related Questions

With reference to 'stem cells', frequently in the news, which of the following statements is/are correct? 1. Stem cells can be derived from mammals only. 2. Stem cells can be used for screening new drugs. 3. Stem cells can be used for medical therapies. Select the correct answer using the codes given below.
In the question two statements are given, followed by two conclusions, I and II. Read all the conclusions and then decide which of the given conclusions logically follow/s from the given statements. Statements: All white blood cells are red blood cells. Some blood cells are red blood cells. Conclusions: I. All blood cells are red blood cells, is a possibility. II. Some red blood cells are not blood cells.
S1:The heart is pump of life.
P :They have even succeeded in heart transplants.
Q :Nowadays surgeons are able to stop a patients heart and carry out complicated operations.
R :A few years ago it was impossible to operate on a patient whose heart was not working properly.
S :If heart stops we die in about five minutes.
S6:All this was made possible by the invention of heart-lung machine.

The Proper sequence should be:
Match the structures given in Column I with the tissue given in Column II in which they are present. Select the correct answer using the codes given below : Column I Column II 1. Chondrocyte (a) Nervous tissue 2. Fat cells (b) Voluntary muscle fibre 3. Myofibril (c) Cartilage 4. Axon (d) Bone 5. Periosteum (e) Adipose tissue
With reference to 'stem cells', frequently in the news, which of the following statement(s) is/are correct?
1. Stem cells can be derived from mammals only.
2. Stem cells can be used for screening new drugs.
3. Stem cells can be used for medical therapies.
Select the correct answer:
With reference to Leukaemia, a cancer of the blood cells considers the following statements: i. It occurs in the bone marrow and results in high numbers of abnormal blood cells. ii. Symptoms include bleeding, fatigue, fever, and an increased risk of infections. Select the correct answer using the code given below:
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: A heart attack usually occurs when a blood clot blocks blood flow to the heart. B: Without blood, tissue loses oxygen and dies. C: Some symptoms of a heart attack include tightness or pain in the chest, neck, back, or arms, as well as fatigue, lightheadedness, abnormal heartbeat, and anxiety.  D: A heart attack is a medical emergency.
In a town fair 50 people were asked which dessert they liked: ice cream, Donuts, or cupcakes. 28 said they like ice cream, 26 said they like donuts, and 26 said they like cupcakes. 8 said they like all three. 17 said they like donuts and cupcakes, 11 said they like ice cream and cupcakes. 5 said they do not like any of these. Find those people who liked ice cream and donuts but not cupcakes.
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
Modern civilisation is completely dependent on energy, which has therefore to be abundant and also economical. About 85% of the world's energy is supplied by oil, coal and natural gas while nuclear, hydro, wind and solar power and biomass supply the rest. Coal, nuclear and hydro are used primarily to generate electricity while natural gas is widely used for heating. Biomass is used both for heating and cooking. The wind and solar power is the future's hope as they are sustainable energy sources. Oil powers almost all machines that move and that makes oil uniquely versatile. Oil powered airplanes carry 500 people across the widest oceans at nearly the speed of sound. Oil powered machines produce and transport food. Oil powered machines are ubiquitous. Clearly, we live in the age of oil but it is drawing to a close. According to data available if oil production remains constant until it's gone, there is enough to last 42 years. Oil wells will produce less as they become depleted, which will make it impossible to keep production constant. Similarly natural gas and coal will last another 61 years and 133 years respectively. Naturally, as they become scarce, they become expensive, leading to a worldwide energy crisis. If we are to survive on this planet, we have to make a transition to sustainable energy sources. The transition may be willy-nilly or planned - the choice is ours. The dawning era of limited and expensive energy will be very difficult for everyone on earth but will be even more difficult if it is not anticipated. It is of utmost importance that the public and policymakers understand the global energy crisis and act in tandem to ensure that the species 'homo sapiens' does not become extinct. The energy sources of the future are
Consider the following statements about the Open and Closed Blood Circulatory System:   A) Open blood circulatory system does not contain special blood vessels to carry oxygenated and deoxygenated blood, while in the closed blood circulatory system blood vessels are present. B) Oxygenated and Deoxygenated blood gets mixed in the closed blood circulatory system, while oxygenated and deoxygenated blood does not get mixed in the open blood circulatory system. Choose the correct statement.