nucleotide base pairs found in DNA?

The experiment of Erwin Chargaff proved that the number of adenines (A) and thymines (T) in DNA is the same as the number of guanine (G) and cysteine (C) in DNA. A. True B. False

Which statement about DNA bases is true?   A. Adenine and guanine are purines.   B. Thymine and adenine are pyrimidines.   C. Guanine and cytosine are pyrimidines.   D. Guanine and cytosine are purines.   E. None are correct

Which of the following is NOT true of deoxyribonucleic acid (DNA)?   A. None of the other four answers (all are true of DNA) B. Each DNA nucleotide contains the sugar ribose, phosphate, and one of the following nitrogenous bases: adenine, uracil, guanine, or cytosine C. Stores genetic information that can be expressed within a bacterial cell, transferred “vertically” to offspring  cells, or “horizontally” to other recipient cells D. Found as a circular molecule in bacteria, either as chromosomes or plasmids  E. Serves as a template for the transcription of mRNA

N C N HC C GH CH N H Which base normally pairs with this structure: a. Thymine b. Adenine c. Cytosine d. Guanine

If C +T/A + G equals 0.5 in one strand, what is the ratio of these bases in the complementary strand? A. 0.25 B. 0.5 C. 1 D. 2 E. 4

Which of the following relations will be found in the percentages of bases of a double-stranded DNA molecule? a. A+T-G+C b. A+G=T+C A+C-G+T c. d. (A +T)/ (C+G) = 1.0 e. (A+G)/ (C+T)= 1.0 f. (A/C)=(G/T) g. (A/G)=(T/C) h. (A/T)=(G/C)

What amino acid residue interacts with molecular oxygen (O2) in hemoglobin?   a. Phenylalanine   b. Serine   c. Valine   d. Histidine

In a DNA molecule,   Select one: A.  The nucleotides are hydrogen-bonded to one another B.  The bases are covalently bonded to one another. C.  The bases are hydrogen-bonded to the sugars. D.  The nucleotides are covalently bonded to one another.

What is the approximate length of a complete turn of a double helix of DNA? A. 3400 pm B. 340 pm C. 2000 pm D. 800 pm