Concept explainers
Videos
To list and explain:
The importance of purine and pyrimidine bases
Introduction:
Watson and Crick built a model of the double helix for DNA that conformed to other scientists’ research. Together they solved the structure of DNA. They suggested that DNA was a double helix formed by two strands of nucleotides twisted around each other.
Answer to Problem 15STP
The purine bases are adenine and guanine.
The pyrimidine bases are thymine and cytosine.
The purines and the pyrimidines form complementary base pairs in the structure of DNA. This maintains a uniform distance between the two
Explanation of Solution
According toWatson and Crick’s model of DNA, there are two chains of nucleotides that are held together by the nitrogenous bases. The bases are joined together by weak hydrogen bonds.There are two types of bases; purines and pyrimidines. Adenine and guanine are purines while thymine and cytosine are pyrimidine bases.
The basesform pairs with one purine base from one chain hydrogen bonded to onepyrimidine base from the other chain. This ensures a consistent distance between the two nucleotide chains. The number of purine bases is also equal to the number of pyrimidine bases in a sample of DNA. Hence, A=T and C=G. Also, C+T= A+G.
The hydrogen bonds can form only between specific bases, so the bases on one strand determine the bases on the other strand. So adenine on one strand will pair with only thymine on the other strand, and guanine will pair with cytosine. These base pairs are called complementary base pairs. This specific base pairing is responsible for the copying mechanism in DNA. During replication each new strand formed is complementary to the original strand due to specific base pairing mechanism. The replication of DNA is semi- conservative.
Chapter 13 Solutions
Biology Illinois Edition (Glencoe Science)
Additional Science Textbook Solutions
Organic Chemistry (8th Edition)
Anatomy & Physiology (6th Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
Chemistry: An Introduction to General, Organic, and Biological Chemistry (13th Edition)
Introductory Chemistry (6th Edition)
Chemistry & Chemical Reactivity
- students in a science class investiged the conditions under which corn seeds would germinate most successfully. BAsed on the results which of these factors appears most important for successful corn seed germination.arrow_forwardI want to write the given physician orders in the kardex formarrow_forwardAmino Acid Coclow TABle 3' Gly Phe Leu (G) (F) (L) 3- Val (V) Arg (R) Ser (S) Ala (A) Lys (K) CAG G Glu Asp (E) (D) Ser (S) CCCAGUCAGUCAGUCAG 0204 C U A G C Asn (N) G 4 A AGU C GU (5) AC C UGA A G5 C CUGACUGACUGACUGAC Thr (T) Met (M) lle £€ (1) U 4 G Tyr Σε (Y) U Cys (C) C A G Trp (W) 3' U C A Leu בוט His Pro (P) ££ (H) Gin (Q) Arg 흐름 (R) (L) Start Stop 8. Transcription and Translation Practice: (Video 10-1 and 10-2) A. Below is the sense strand of a DNA gene. Using the sense strand, create the antisense DNA strand and label the 5' and 3' ends. B. Use the antisense strand that you create in part A as a template to create the mRNA transcript of the gene and label the 5' and 3' ends. C. Translate the mRNA you produced in part B into the polypeptide sequence making sure to follow all the rules of translation. 5'-AGCATGACTAATAGTTGTTGAGCTGTC-3' (sense strand) 4arrow_forward
- What is the structure and function of Eukaryotic cells, including their organelles? How are Eukaryotic cells different than Prokaryotic cells, in terms of evolution which form of the cell might have came first? How do Eukaryotic cells become malignant (cancerous)?arrow_forwardWhat are the roles of DNA and proteins inside of the cell? What are the building blocks or molecular components of the DNA and proteins? How are proteins produced within the cell? What connection is there between DNA, proteins, and the cell cycle? What is the relationship between DNA, proteins, and Cancer?arrow_forwardWhy cells go through various types of cell division and how eukaryotic cells control cell growth through the cell cycle control system?arrow_forward
Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSON
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Anatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education