Introduction To Genetic Analysis
12th Edition
ISBN: 9781319114787
Author: Anthony J.F. Griffiths, John Doebley, Catherine Peichel, David A. Wassarman
Publisher: W. H. Freeman
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Chapter 1, Problem 13P
Summary Introduction
To determine: The number of cytosines, thymine, and guanine in a DNA double helix with 100 base pairs and 32 adenines.
Introduction: The DNA consists of four nitrogenous bases that are adenine, cytosine, guanine, and thymine. The nitrogenous base pairs are pyrimidine (thymine and cytosine) and purine (adenine and guanine), which base pairs with each other. The base pairs are joined by weak hydrogen bonding.
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If a DNA double helix that is 100 base pairs in length has32 adenines, how many cytosines, guanines, and thymines must it have?
If a DNA double helix contains 28% T nucleotides, then what is the percentage of A nucleotides?
What does it mean to say that the DNA strands in a double helix have opposite directionality or polarity?
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Introduction To Genetic Analysis
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- In a segment of DNA consisting of 1000 nitrogen bases, 28% of which are thymine, how many bases are adenine, guanine, and cytosine?arrow_forwardWhat is the sequence of amino acids coded by the following sequence of nucleotides on a strand of DNA from the 5' to 3' end? A - T - C - G - C - T - A - C - G - A - A - T How many nucleotides are there?arrow_forwardOne DNA chain of a DNA double helix contains 18% A, 35% T, 28% C, and 21% G. What is the composition of the complementary DNA chain?arrow_forward
- How many hydrogen bonds will be involved in base pairing in a DNA molecule of 100 base pairs that contains 30 cytosine bases?arrow_forwardA double-stranded DNA molecule is 1 cm long, and the percentage of adenine is 15%. How many cytosines does this DNA molecule contain?arrow_forwardIn a single strand of DNA, is it ever possible for the number of adenines to be greater than the number of thymines? Describearrow_forward
- If one side of DNA molecule had a base sequence of adenine-adenine-guanine-cytosine-thymine-cytosine-thymine, what would the sequence of bases on the opposite side of the molecule be?arrow_forwardWhat are the three components of a nucleotide? With regard to the 5′ and 3′ positions on a sugar molecule, how are nucleotides linked together to form a strand of DNA?arrow_forwardHow many combinations of DNA bases are for a polynucleotide of 7 base pairs in length?arrow_forward
- A DNA strand consists of any sequence of four kinds of nucleotides. Suppose there were only 14 different amino acids instead of 20. Which of the following statements would be correct descriptions of the minimal number of nucleotides necessary to create a genetic code? a) 1 b)2, provided that chain termination does not require a special codon c) 3, provided that chain termination does require a special codon d)2, no matter how chain termination is accomplished e) Both b and carrow_forwardWhat nucleobase atoms are located in the “major groove” of DNA? What atoms are located in the “minor groove” of DNAarrow_forwardDRAW A DNA STRAND WITH 10 ADENINE BASES FOLLOWED BY 10 CYTOSINE BASES. IF THAT SAME STRAND BONDED TO A STRAND OF 15 THYMINE BASE AND 5 GUANINE BASES, HOW WOULD THE DOUBLE HELIC SHAPE VARY FROM A TYPICAL DNA DOUBLE HELIX?arrow_forward
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