Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 16, Problem 16.1CR
What does it mean wheti we say that the two DNA strands in the double helix are antiparallel? What would an end of the double helix look like if the strands were parallel?
Expert Solution
Summary Introduction
To explain: The meaning of the statement “the two strands in the double helix DNA are antiparallel”.
Introduction: DNA is a double-stranded molecule that consists of two strands of nucleotides. The bases in one strand are complementary to the bases on the other strand. During DNA replication, the two strands of parent DNA molecule separate. The parent strands act as templates along which the DNA polymerases add up the complementary base pairs in the context of base-pairing rules.
Explanation of Solution
A deoxyribonucleic acid (DNA) molecule consists of two polynucleotide chains that associate as a double helix structure. The polarity in the DNA chain is referred to as 5ʹ end and the other as 3ʹ end. One end of DNA consists of a phosphate attached to a 5ʹ deoxyribose carbon (5ʹ end), and the other end has a hydroxyl group that is attached to a 3ʹ deoxyribose carbon (3ʹ end). The nucleotides are linked by phosphodiester bonds through 5ʹ-P of one sugar and 3ʹ-OH group of the next sugar. In a double-stranded DNA, one strand is “complemented” by the other strand. If one DNA strand runs in the 5ʹ→3ʹ direction, its complementary strand would run in the 3ʹ→5ʹ direction. Thus, the two strands are antiparallel to each other.
Expert Solution
Summary Introduction
To determine: The ends of a double helix DNA if the two DNA strands in the double helix were parallel.
Introduction: DNA or deoxyribonucleic acid carries hereditary information from one generation to another. DNA replication is a process that takes place in every biological cell. It involves the coping and producing of two identical copies of a cell from their parent DNA molecule.
Explanation of Solution
If two DNA strands run in parallel directions, they would run in the same direction, that is, they would both run in the 5′→3′ direction. In such a condition, in the same side, an end of the DNA molecule would have two 5′ ends and two 3′ ends.
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Chapter 16 Solutions
Campbell Biology
Ch. 16.1 - Given a polynucleotide sequence such as GAATTC,...Ch. 16.1 - VISUAL SKILLS Griffith was trying to develop a...Ch. 16.2 - What role does complementary base pairing play in...Ch. 16.2 - Identify two major functions of DNA pol III in DNA...Ch. 16.2 - Prob. 3CCCh. 16.2 - Prob. 4CCCh. 16.3 - Describe the structure of a nucleosome, the basic...Ch. 16.3 - Prob. 2CCCh. 16.3 - MAKE CONNECTIONS Interphase chromosomes appear to...Ch. 16 - What does it mean wheti we say that the two DNA...
Ch. 16 - DRAW IT Redraw the Punnett Square on The right...Ch. 16 - Prob. 16.3CRCh. 16 - In his work with pneumonia-causing bacteria and...Ch. 16 - What is the basis for tlie difference in how the...Ch. 16 - In analyzing the number of different bases in a...Ch. 16 - The elongation of the leading Strand during DNA...Ch. 16 - In a nucleosome, the DNA is wrapped around (A)...Ch. 16 - E. coli cells grown on, 15N medium are transferred...Ch. 16 - A biochemist isolates, purifies, and combines in a...Ch. 16 - The spontaneous loss of amino groups from adenine...Ch. 16 - MAKE CONNECTIONS Although the proteins that cause...Ch. 16 - EVOLUTION CONNECTION Some bacteria may be able to...Ch. 16 - SCIENTIFIC INQUIRY DRAW IT Model building can be...Ch. 16 - Prob. 12TYUCh. 16 - Prob. 13TYU
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