BIOCHM 1090 Lecture Notes - Lecture 30: Semiconservative Replication, Francis Crick, Cytosine

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limegerbil338

19 Mar 2018

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!1 (3) the base pairing explains why a and t occur in equal amounts in double-stranded. Dna, as do c and g i) the strength and shape of the dna double helix depends on the t and hydrogen bonding of the bases. Nucleic acids and heredity: a sperm cell carrying dna from your father united with an egg cell carrying dna from your mother. 2. transcription: the process by which dna is read and copied a) the products of transcription are ribonucleic acids, which carry the instructions stored by. 3. translation: the process by which the messages carried by rna are used to build proteins. Structure and function of rna: rna is similar to dna - both are sugar-phosphate polymers and both have nitrogen-containing bases attached - but there are important differences. B. there are different kinds of rna, each type with its own unique function in the ow of genetic information, whereas dna has only one function.

Related Questions

Which of the following statements describing the Watson-Crick model for DNA structure is INCORRECT?

A. DNA has two grooves running helically along its length, one of which is wider than the other.

B. The base-paired polynucleotide chains have antiparallel directions.

C. The classic Watson-Crick hydrogen bonding between AT and GC pairs is found in Z-DNA.

D. One turn of the double helix involves approximately 10 nucleotides.

E. The helical structure is stabilized entirely by hydrogen bonding.

beigecoyote778

Consider the structure of the DNA double helix.

A. You and a friend want to split a double-stranded DNA molecule so you each have half. Is it better to cut the length of DNA in half so each person has a shorter length, or to separate the strands and each take one strand? Explain.

B. In the original 1953 publication describing the discovery of the structure of DNA, Watson and Crick wrote, âIt has not escaped our notice that the specific pairings we have postulated immediately suggest a possible copying mechanism for the genetic material.â What did they mean?

1. Which of the following are characteristics of theWatson-Crick

DNA double helix? (there are more than one answer)

a. The two polynucleotide chains are coiled about a common

axis.

b. Hydrogen bonds between A and C and between G and T hold

the two chains together.

c. The purines and pyrimidines are on the inside of the

helix and the phosphodiester backbones are on the

outside.

d. Base composition analyses of DNA duplexes isolated from

many organisms have shown that the amounts of A and T are

equal as are the amounts of G and C.

e. The sequence in one strand of the helix varies

independently of that in the order strand.

2. Which of the following statements about reversetranscriptase

are correct (there are more than one answer,5 points)

a. Reverse transcriptase uses DNA as a template tosynthesize

DNA.

b. Reverse transcriptase uses RNA as a template tosynthesize

RNA.

c. Reverse transcriptase uses DNA as a template tosynthesize

RNA.

d. Reverse transcriptase is found in the virions of all RNA

tumor viruses.

e. Reverse transcriptase hydrolyzes RNA in DNA-RNA hybrid

duplexes.

3. Several dozen oncogenes are known to code for receptortyrosine

kinases. Many of these oncogenes produce mutant receptors,

whose tyrosine kinase activity is permenantly activated,this

is called,(5 points)

a. Autophosphorylation

b. Constitutively active

c. Growth factor dependency

d. a,b,c

e. None of the above

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BIOCHM 1090 Lecture Notes - Lecture 30: Semiconservative Replication, Francis Crick, Cytosine

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