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प्रश्न
Give a reason why :
DNA cannot pass into a host cell through the cell membrane.
उत्तर
We know that the cell membrane is made up of phospholipid bilayers which means it has both hydrophilic and hydrophobic regions. DNA being a hydrophilic molecule will face a problem in passing through the hydrophobic regions of the plasma membrane. It is an extremely energy-consuming process. This is the reason why host cells are made competent to take up the DNA.
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संबंधित प्रश्न
The ________enzyme is used to cut DNA at specific point
(a) DNA polymerase
(b) Alkaline phosphatase
(c) restriction endonuclease
(d) DNA ligase
Answer the following question.
Explain the mechanism of DNA replication with the help of a replication fork. What role does the enzyme ONA-ligase play in a DNA replication fork?
Multiple Choice Question:
Griffith worked on ____________.
Describe the Hershey-Chase experiment in detail.
When DNA is transferred from a culture of capsulated Streptococcus to a culture of non-capsulated Streptococcus, converting the latter into the former type, the process is known as ____________.
Who among the following discovered transformation?
Identify the amino acids that are majorly present in histones.
Replication was allowed to take place in the presence of radioactive deoxynucleotides precursors in E.coli that was a mutant for DNA ligase. Newly synthesised radioactive DNA was purified and strands were separated by denaturation. These were centrifuged using density gradient centrifugation. Which of the following would be a correct result?
If the DNA of a virus is labelied with 32P and the protein of the virus is labelled with 35S, after transduction which molecules (s) would be present inside the bacterial cells.
Give reason: On injecting a mixture of heat-killed S-bacteria and live R-bacteria, the mice died.
