BIO.SCI.UDEL.VOL1.(LL)W/ACCESS REV >IB
17th Edition
ISBN: 9781323780305
Author: Freeman
Publisher: PEARSON C
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Chapter 4, Problem 4TYK
Summary Introduction
To review:
The functional groups that define the two different ends of a
Introduction:
In molecular biology and biochemistry, directionality refers to chemical orientation of a single strand of nucleic acid. The directionality of the two ends of a single strand of a nucleic acid can be defined by the functional groups present at the ends of the strand.
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Draw a two-stranded anti-parallel beta-sheet where each strand is 5 amino acids long. Use “R” to show the placement of the side chains and indicate H bonds. Also, use wedges and dashes to indicate directionality of R and H.
DNA molecules consist of chemically linked sequences of the bases adenine, guanine, cytosine, and thymine, denoted A, G, C, and T. A sequence of three basesiscalleda codon. A base may appear more than once in a codon. a) How many different codons are there? b) The bases A and G are purines, while C and T are pyrimidines. How many codons are there whose first and third bases are purines and whose second base is a pyrimidine? c) How many codons consist of three different bases?
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Chapter 4 Solutions
BIO.SCI.UDEL.VOL1.(LL)W/ACCESS REV >IB
Ch. 4 - What are the four nitrogenous bases found in RNA?...Ch. 4 - 2. What determines the primary structure of a DNA...Ch. 4 - 3. Which of the following describes the synthesis...Ch. 4 - Prob. 4TYKCh. 4 - Prob. 5TYUCh. 4 - Prob. 6TYUCh. 4 - What would be the sequence of the strand of DNA...Ch. 4 - 8. According to the RNA world model, a ribozyme...Ch. 4 - Make a concept map (see BioSkills 12 ) that...Ch. 4 - Prob. 10TYPSS
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- Draw the structure of a phosphodiester linkage.arrow_forwardIf the DNA sequence A-T-T-G-G-C-C-T-A on an informational strand mutated and became A-C-T-G-G-C-C-T-A, what effect would the mutation have on the sequence of the protein produced?arrow_forwardTRUE OR FALSE a) The 2 chains composing one double helix run in opposite directions; they are antiparallel (one is 5’->3’ and the other 3’->5’). b) DNA molecules can perform their function in replication and transcription as long as the hydrogen bonds between the bases remain intact.arrow_forward
- What are the monomers that makeup a nucleic acid and what are the monomers composed of? What type of bond is found along the backbone of the DNA backbone?arrow_forwardTo create a DNA:RNA hybrid from a short stretch of DNA with the sequence 5'-GGCTAAGTATGCCTAGTAGC-3', design the corresponding RNA sequence. Indicate the sequence in a 5' to 3' manner. What type of helix (A, B or Z) will this double-stranded nucleic acid form?arrow_forwardDo any strands of nucleic acid exist in nature in which part of the strand is DNA and another part of that same strand is RNA? If so, describe when such strands of nucleic acid are synthesized. Is the RNA component at the 5′ end or at the 3′ end?arrow_forward
- if the guanine content of certain segment of double-stranded DNA is 22% what is the adenine content?arrow_forwardHairpins may form at palindromic sequences in single strands of either RNA or DNA. How is the helical structure of a long and fully base-paired (except at the end) hairpin in RNA different from that of a similar hairpin in DNA?arrow_forwardWhat sequence of bases on one strand of DNA (reading in the 3′ to 5′ direction) is complementary to the sequence 5′ T-A-T-G-C-A-G 3′ on the other strand?arrow_forward
- Describe the three forms that a double helix can assume.arrow_forwardA segment of DNA containing 20 base pairs includes 7 guanine residues. How many adenine residues are in the segment? How many uracil residues are in the segment?arrow_forwardIf one of the strands of DNA has the following sequence of bases running in the 5-S3' direction,5'-G-G-A-C-A-A-T-C-T-G-C-3' what base is closest to the 5'-end in the complementary strand?arrow_forward
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