Answer the following questions about the four DNA nucleobases shown above: A. What are the names of the nucelobases designated as (II) and (IV)? (4 points, 2 points each) (II) - ; (IV) - B. Draw structural formulas of DNA nucleobases in boxes (I) and (III), which form Watson Crick base-pairs with the DNA nucleobases shown in (II) and (IV) (6 points, 3 points each) C. Is nucleobase (I) a purine or a pyrimidine? (1 point) Answer: D. Is nucleobase (III) a purine or a pyrimidine? (1 point) Answer: Question 12 (2 points): Which of the following are possible base compositions for a double-stranded DNA? %A %G %C %T %U A. 12 38 15 30 5 B. 43 43 7 7 0 C. 15 35 35 15 0 D. None of the above E. All of the above
Added by Paula B.
Close
Step 1
(II) is Adenine (A) and (IV) is Cytosine (C). Now, let's find the nucleobases that form Watson-Crick base pairs with (II) and (IV). Adenine (A) forms a base pair with Thymine (T), and Cytosine (C) forms a base pair with Guanine (G). Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 78 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
In which of the following molecular processes is the formation of Watson-Crick type base pairs between DNA or RNA polynucleotides NOT critical to the mechanism? PCR Transcription DNA replication Translation No good answer - all of these depend to some degree upon base pairing interactions Which one of the following types of molecule carries the coded sequence for a protein? mRNA DNA polymerase tRNA RNA polymerase rRNA The only source of new gene alleles in a population of a species is? Cell division Meiosis The centrosome Mutation If one strand of DNA double helix has the sequence of bases 5’-CCGTTA-3’, the complementary DNA strand would have the sequence: 5’-CGGTAA-3’ 5’-TAACGG-3’ 3’-CGGATT-5’ 3’-TTACGG-5’ 3’-AAUGGC-5’ Which of the following statements about the Watson/Crick model of DNA is false? Cytosine base-pairs with guanine and thymine base-pairs with adenine The two strands are held together by hydrogen bonds and can be separated by the enzymes in the cell Purines base-pair with pyrimidines and pyrimidines base-pair with purines The two strands go in opposite directions (reading 5’ – 3’) in the double helix The sugar-phosphate backbone is on the inside of the molecule and the bases are on the outside
Adi S.
What are the four pairs of DNA bases that form in the double helix? The four pairs of DNA bases. 12. How can you distinguish C from G? Which DNA double helix do you think would be harder to separate into two strands: DNA composed predominantly of AT base pairs or GC base pairs? Why? What is mutation? Like a twisted ladder: What makes up each rung of the ladder? What holds the rungs together at the sides? What is the space between the atoms in a DNA double helix? Is it mostly empty? Do normal Watson-Crick hydrogen bonds form between base pairs? Can you find one base pair in a specific position and obtain its letter and sequence number? (Note: Clicking on any base line, following the sequence number at the bottom of the browser window in the status bar will obtain the letters and sequence numbers of the abnormal base pair. Once you find it, answer this question.) How do proteins recognize specific sequences of DNA? Question Set B 19. Which bases are purines? Pyrimidines?
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD