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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.

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Answer:

B, D, D

Explanation: Chargaff’s rule is that the percentages of Adenine equal those of Thymine and the percentages of Guanine equal those of Cytosine meaning B is the correct answer for the first one. For the second one, conservative means to keep and semi mean half therefore semi conservative means keeping half meaning D is the correct answer. For the last one, D is the answer because adenine pairs with thymine and guanine pairs with cytosine.

Chargaff's rule, only complimentary bases could form bonds and line up in situ in an exceedingly new DNA strand.

In DNA there's always equality in quantity between the bases A(adenine) and T(thymine) and between the bases G(guanine) and C(cytosine)

  • In DNA, the number of adenine always equals to it of thymine, and also the proportion of guanine always equals there to of cytosine, so option B is correct to define by Chargaff's rule.

  • The process starts when DNA has wrapped around protein molecules called histones. The combined loop of DNA and protein is termed a nucleosome, Option D is correct to define the composition of DNA.

Nucleosomes

Nucleosomes are packaged into a thread, which is sometimes described as beads on a string. The end result is a fiber known as chromatin.

  • Therefore, to define the composition of DNA by Chargaff's rule the correct option is B and D.

  • The correct sequence of complementary DNA strands is Option D TGA CGT.

Learn more about the DNA composition by Chargaff's rule here:

https://brainly.com/question/10613620

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