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Which of the following statements is supported by Chargaff's rule about the composition of DNA?

A:DNA is a single stranded nucleic acid that contains uracil.

B:The number of adenines in a strand of DNA is equal to the number of thymines.

C:The "steps" of the DNA ladder are made of sugar and phosphates.

D:DNA is a complex of RNA wrapped around protein

Why is DNA replication said to be semiconservative?

A:The old cell keeps part of the original DNA during cell division.

B:The new DNA strand can only be constructed in the 3' to 5' direction.

C:The double helix becomes a single strand of DNA.

D:New DNA has one original strand and one replicated strand.

Which of the following is the complimentary DNA strand for the sequence shown below?
ACT GCA
A:ACG TCA

B:ACU GCA

C:UCT GCU

D:TGA CGT

What is the central dogma of molecular biology? Explain its meaning.

Respuesta :

Answer:

1) The correct answer is option B: The number of adenines in a strand of DNA is equal to the number of thymines for the statements that is supported by Chargaff's rule about the composition of DNA.

2) The correct answer is option D: New DNA has one original strand and one replicated strand for the statement that DNA replication said to be semiconservative.

3) Central dogma of molecular biology means that formation of RNA from DNA and formation of protein from RNA.

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