In cellular duplex DNA: Deoxyribose units of each strand are connected by 3\', 5

Question

In cellular duplex DNA: Deoxyribose units of each strand are connected by 3', 5'-phosphodiester bonds. Nucleotide residues of opposing strands are connected by hydrogen bonds. The ratio A+G/T+C is constant. The two complementary strands are antiparallel. All of the above are true. Which of the following is FALSE? In the Watson-Crick model of DNA structure: A purine in one strand always hydrogen bonds with a pyrimidine in the other strand. A-T pairs share three hydrogen bonds; G-C pairs share two hydrogen bonds. The 5' ends of each strands are at opposite ends of the helix. Hydrogen bonds between the strands occur through the nitrogenous bases or All of the above are true. Which of these sequences is capable of forming a hairpin structure? GGGGGGAAAAAA GACGACGAGCAC GGGGGGGGGGGG GACGACGTCGTC E. CATCATTACTAC A single-stranded DNA of the sequence 5-GCCAAGAAA-3would be able stable duplex with which of the following RNA strands? 5'-CGGTTCTTT-3' 5'-UUUCUUGGC-3' 5'-TTTCTTGGC-5' 5' -CGGUUCUUU-3' 5'-GCCAAGAAA-3'

Explanation / Answer

Answer:

1). E. All of the above

2). B. A-T pairs share three hydrogen bonds; G-C pairs share two hydrogen bonds

A-T pairs share two hydrogen bonds; G-C pairs share three hydrogen bonds.

3). D. GACGACGTCGTC

G=C; A=T

4). B. 5’-UUUCUUGGC-3’

A=U; G=C in mRNA.

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