Yeasts can grow in the presence or absence of air. Anaerobic growth, growth in the absence of oxygen, is quite slow and inefficient. For instance, in bread dough, yeast grow very little. Instead, the sugar that can sustain either fermentation or growth is used mainly to produce alcohol and carbon dioxide. Only a small portion of the sugar is used for cell maintenance and growth.
Best Answer: Dna is a double helical structure with two strands of nitrogenous bases being held together by hydrogen bonds. Phosphodiester bonds hold bases together on the same strand.Between deoxyribose and a phosphate group. Hydrogen bonds hold the two strands together. Adenine and Thymine have 2 H bonds always.Guanine and Cytosine have 3 H bonds always.hosphodiester bonds hold bases together on the same strand. Between deoxyribose and a phosphate group. Hydrogen bonds hold the two strands together. Adenine and Thymine have 2 H bonds always.
The two polynucleotide chains that comprise each molecule of deoxyribonucleic acid, or DNA, are held together by two forces: hydrogen bonding and hydrostatic forces. Hydrogen bonds form between... The two polynucleotide chains that comprise each molecule of deoxyribonucleic acid, or DNA, are held together by two forces: hydrogen bonding and hydrostatic forces. Hydrogen bonds form between complementary base pairs, while hydrostatic forces determine the orientation of the hydrophilic phosphate backbone relative to the more hydrophobic base pairs. Each polynucleotide chain is comprised of a negatively charged phosphate backbone that connects a sequence of base pairs.