Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology excretory system of human artificial kidney kidney transplant disorders of kidney

Isografts are not rejected during a kidney transplant because the donor is 

  1. Genetically identical.

  2. Genetically dissimilar.

  3. Belongs to same species.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Isograft is a tissue or organ transplanted from a donor to a recipient who are identical or monozygotic twins. In an isograft transplantation the chances of rejection are near to nil with identical MHCs as they are genetically identical.

So, the correct answer is 'Genetically identical.'

Multiple choice biology excretory system of human artificial kidney kidney transplant disorders of kidney

Which of the following cell-surface proteins encoded by HLA is estimated before the transplant before rejection?

  1. Immunoglobulins

  2. MHC

  3. APC

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Major Histocompatibility Complex (MHC) molecules are the cell-surface proteins encoded by HLA genes that are primarily responsible for the immune system recognizing the donor organ as foreign.

Multiple choice biology excretory system of human artificial kidney kidney transplant disorders of kidney

The transplant of a kidney from a monkey into human is rejected vigorously since it acts as a

  1. Autograft.

  2. Xenograft.

  3. Isograft.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Monkey and humans have evolved into two distinct lineages and are distinct species and therefore have a dissimilar genetic composition. Any transplant between these two organisms is known as a xenograft. Which may be rejected vigorously due to greater than required MHC incompatibility.

So, the correct answer is 'Xenograft'


Multiple choice biology excretory system of human artificial kidney kidney transplant disorders of kidney

Which of the following type of donor is rejected during kidney transplant?

  1. Autograft

  2. Isograft

  3. Allograft

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Allograft is a tissue or organ transplanted from a donor to recipient of the same species but is genetically different and therefore may face rejection during kidney transplant due to distinct HLA proteins

So, the correct answer is 'Allograft'

Multiple choice biology excretory system of human artificial kidney kidney transplant disorders of kidney

The highest genetic variation is seen in which of the following type of the donor for a kidney transplant?

  1. Autograft

  2. Xenograft

  3. Allograft

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A xenograft involves transplanting tissue between different species, which results in the highest level of genetic variation and the most severe immune rejection response compared to autografts or allografts.

Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

In batch fermentation:

  1. substrates are added to the system all at once and runs until product is harvested

  2. nutrients are continuously fed into the reactor and the product Is siphoned off during the run

  3. new batches of microorganisms are screened for increase yield

  4. small-scale production is used to synthesise product.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Fermentation is a metabolic process which converts carbohydrates to alcohols, organic acids are gases by the activity of the enzyme of microbial origin.
Batch fermentation is a process where the microorganism is inoculated into a fixed volume of medium. As the growth takes place the nutrients that are consumed and the product of growth keeps getting stored in the fermenter.
In batch fermentation, the mass production is done as separate batches. 
So, then the correct option is 'substrates are added to the system all at once and runs until product is harvested'
Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

Penicillin inhibits bacterial multiplication because it

  1. Checks RNA synthesis

  2. Checks DNA synthesis

  3. Destroys chromatin

  4. Inhibits cell wall formation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Antibiotics are chemical substances, which are produced by some microbes and kill or retard the growth of other ( disease-causing ) microbes. Penicillin was the first antibiotic discovered. Penicillin inhibits bacterial growth by inhibiting cell wall formation, hence, killing the bacteria.

So, the correct answer is 'Inhibits cell wall formation'

Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

Read the following statements and select the correct option:
STATEMENT I: Nostoc and bacteria are prokaryotes.
STATEMENT II: Penicillium and Spirogyra are fungi.

  1. Only statement I is true

  2. Only statement II is true

  3. Both statements I and II are true

  4. Both statements I and III are false
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nostoc is a cyanobacterium. Along with bacteria, Nostoc belongs to the prokaryotic organisms as they do not possess the well-defined nucleus and double membrane-bound organelles. In statement 2, Penicillium is a fungus but Spirogyra is an alga. Thus, the correct option is A.

Multiple choice biology interdependence of organism and the environment natural cycles and resources constituents of air medicinal use of microorganism

Which of the following is the main function of antibiotic drugs in human body?

  1. Prevention of the growth of bacteria

  2. To control the level of oxygen

  3. To maintain the blood pressure

  4. To control sugar level in blood
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An antibiotic is a type of antimicrobial substance active against bacteria and is the most important type of antibacterial agent for fighting bacterial infections. Antibiotic medications are widely used in treatment and prevention. They have an important role in dental antibiotic prophylaxis where their use may prevent. So, the correct option is "A" (Prevention of the growth of bacteria).