If one strand of DNA has the base sequence 5\' AAGCAA 3\', another strand has wh
ID: 171635 • Letter: I
Question
If one strand of DNA has the base sequence 5' AAGCAA 3', another strand has which of the following sequences? a. 3' UUCGUUS' b. 5' TTCGTT 3' c. 3' UTCGTU 5' d. 3' TTCGTT 5' e. 5' UUCGUU 3' The four nitrogenous buses of DNA are abbreviated as ___. a. A, G, C, and T b. A, G, T, and N C. G, C, U, and N d. A, G, U, and T e. A, G, C, and U Stem-loop structure is found in ____. a. protein b. carbohydrate c. DNA d. RNA e. lipid In a double-stranded DNA molecule, C% = 28%. What is A%? a. 22% b. 28% c. 56% d. 72% e. none of these Two strands of a DNA molecule are held together by a. phosphodiester bonds b. hydrogen bonds c. peptide bonds d. glycosidic linkages e. none of these In a RNA molecule, A% = 28%. What is T%? a. 0% b. 22% c. 28% d. 56% e. 72% What is the term that describes DNA structure? a. Stem-loop b. a-helix c. Double helixExplanation / Answer
Answer 1 if template strand of DNA is 5' AAGCAA 3' then the complimentary strand of DNA would be 3' TTCGTT 5' because two strands of DNA are anti parallel and complimentary to each other, Answer 1(d)
Answer 2 the four nucleotide bases found in DNA are Adenine( abbr. A), Guanine( abbr. G), thymine( abbr. T) and Cytosine ( abbr. C), Answer 2(a)
Answer 3 stem loop structure is also called hair pin structure found in RNA molecule and is a result of hydrogen bonding , Answer 3(d)
Answer 4 according to chargaff rule ratio between purine and pyrimidines is 1:1, if C= 28% then, G+C %= 28 X 2= 56%, A+T= 100-56= 44%, A= 44/2= 22%[ A=T, G=C ; chargaff rule], Answer 4(a) 22%
Answer 5 (b) two strands are held together by Hydrogen bonds between nitrogenous bases, there is double bond between A & T and tripple bond between G & C
Answer 6(a) 0%, chargaff rule doesn't apply to RNA molecules because they exist as single stranded entity.
Answer 7(c) double helix because it contains 2 chains interwineed to ech other like helix by hydrogen bonds.
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