Scelta multipla
Which purine base forms 3 hydrogen bonds when binding its complementary nucleotide base?
193
views
7. DNA and Chromosome Structure
DNA Structure
Scelta multipla
Which component of a DNA strand is identical in structure for all living organisms?
A
The number of hydrogen bonds between all base pairs
B
The specific order of genes
C
The sugar-phosphate backbone
D
The sequence of nitrogenous bases
Guida verificata passo dopo passo1
Understand the structure of a DNA strand, which consists of three main components: the sugar-phosphate backbone, nitrogenous bases, and hydrogen bonds between base pairs.
Recognize that the sugar-phosphate backbone is made up of repeating units of sugar (deoxyribose) and phosphate groups, which form the structural framework of DNA.
Note that the sugar-phosphate backbone is chemically identical in all living organisms, providing stability and uniformity to the DNA molecule.
Contrast this with the nitrogenous bases (adenine, thymine, cytosine, guanine), whose sequence varies between organisms and encodes genetic information.
Understand that the number of hydrogen bonds varies depending on the base pairs (A-T pairs have 2 bonds, G-C pairs have 3 bonds), so it is not identical across all DNA strands.
Video correlati
Pratica correlata
