The given diagram illustrates three cycles of polymerase chain reaction.How many copies of double stranded DNA will be formed after performing the 6th cycle?
Correct answer: C. 64
- A. 16
- B. 32
- C. 64
- D. 128
Explanation
The polymerase chain reaction (PCR) is a process that amplifies DNA, doubling the number of molecules with each cycle. Starting with one double-stranded DNA, the first cycle produces 2 copies, the second cycle produces 4, the third produces 8, and so on. Therefore, after the 6th cycle, the number of double-stranded DNA molecules is 2^6 = 64. Option C is correct because it correctly represents this exponential growth.Option A (16) and Option B (32) underestimate the number of cycles, while Option D (128) overestimates it as it assumes an additional cycle.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Biotechnology and Health Care
Biotechnology applies genetic engineering, cell culture and recombinant DNA methods to medicine and public health. The material includes production of insulin, vaccines and antibiotics, diagnostic techniques, gene therapy, genetically modified organisms and the ethical concerns surrounding manipulation of human genes.
Practise Biotechnology
731 free Biotechnology MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Biotechnology and Health Care questions
Sticky ends are produced when restriction enzymes cut fragments of DNA.The advantage of these sticky ends in recombinant DNA technology is to :
Which of the following base-pair sequences in the DNA could NOT be recognised by restriction endonuclease as a palindromic sequence?
To protect a farm animal from a plant toxin, a gene for resistance to the toxin was transferred to the farm animal.Which technique is used to obtain this objective?
Given are the steps of DNA fingerprinting (southern blot test).I. X-ray film.II. Electrophoresis.III. Radioactive probing.IV. Digestion with restriction enzyme.The CORRECT sequence in which these steps are followed is:
In the annealing (second) step of polymerase chain reactions (PCR), temperature is lowered to 55-65°C. The reason for lowering the temperature is to:
Sameen is 20 weeks pregnant. Her doctor came to know that she has a family history of Down's syndrome.The prenatal diagnostic test that the doctor would recommend her to check the presence of this disease in the baby is: