To form the double-stranded DNA, purine nucleotides have to pair with pyrimidine nucleotides. Two purine nucleotides cannot pair together, same with the pyrimidines. True False QUESTION 7 The double helical structure of DNA is held together by ___________. ionic bond hydrogen bond phosphodiester bond sugar-phosphate backbone QUESTION 8 The nucleotides of DNA are held together by ___________. ionic bond hydrogen bond phosphodiester bond sugar-phosphate backbone QUESTION 9 During gel electrophoresis, DNA moves towards the negative electrode because DNA is positively charged. True False QUESTION 10 Basic structure of nucleotide includes the following type(s) of chemical components. Phosphate group Deoxyribose sugar Nitrogenous base All of the above
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Step 1: The double helical structure of DNA is held together by hydrogen bonds. Show more…
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Question 11 (2 points) The combination of a monosaccharide like ribose or deoxyribose, a base like purine or pyrimidine, and a phosphate unit is called ______. A) a nucleoside B) a polysaccharide C) a polyamide D) a nucleotide Question 12 (2 points) If a single strand of a gene contains 726 bases, 242 amino acids will make up the polypeptide prepared from it, assuming every base of the gene is transcribed and then translated. True False Question 13 (2 points) In DNA replication, the ______ strand grows continuously, while the lagging strand is synthesized in small fragments.
Sri K.
QUESTION 7 The replication of a molecule of DNA with the base sequence C C A T G will create a new strand of DNA with the sequence: GTACC CCATG CCAUG GGTAC QUESTION 8 In a molecule of DNA, nucleotides in a single strand are joined by which type of bond? phosphate peptide hydrogen covalent QUESTION 9 When considering the candy DNA model described in Exercise 2, the "sugar-phosphate backbone" was represented by which type of candy? marshmallows tootsie rolls red licorice black licorice QUESTION 10 Watson and Crick called the DNA molecule a "double helix" because: there are two strands of nucleotides in a molecule of DNA. the two strands are bonded together through hydrogen bonds between base pairs. the molecule is "twisted" into a helical formation. They called it a double helix for all of the reasons above
Madhur L.
Indicate whether each of the following statements about the structure of DNA is true or false. (Each letter is used to refer to the concentration of that base in DNA.) (a) $A+T=G+C$ (b) $\mathrm{A}=\mathrm{G} ; \mathrm{C}=\mathrm{T}$ (c) $\mathrm{A} / \mathrm{T}=\mathrm{C} / \mathrm{G}$ (d) $\mathrm{T} / \mathrm{A}=\mathrm{C} / \mathrm{G}$ $(\mathrm{e}) \mathrm{A}+\mathrm{G}=\mathrm{C}+\mathrm{T}$ (f) $\mathrm{G} / \mathrm{C}=1$ (g) $\mathrm{A}=\mathrm{T}$ within each single strand. (h) Hydrogen bonding provides stability to the double helix in aqueous cytoplasms. (i) Hydrophobic bonding provides stability to the double helix in aqueous cytoplasms. (j) When separated, the two strands of a double helix are identical. (k) Once the base sequence of one strand of a DNA double helix is known, the base sequence of the second strand can be deduced. (l) The structure of a DNA double helix is invariant. (m) Each nucleotide pair contains two phosphate groups, two deoxyribose molecules, and two bases.
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