Which item is responsible for joining nucleotides to build a new strand of dna?
a. dna polymerase
b. nitrogenous bases end of exam
c. hydrogen-bond breaking proteins
d. telomere

The correct answer is A.

DNA replication is the process  which results in the building or synthesis of a new DNA strand. An enzyme called helicase unwinds the double helix of DNA and separates the two strands up to a certain point , forming a replication fork.

DNA polymerase enzyme then uses each strand as a template to build a  new DNA strand by linking new nucleotides to each other. It links them together by catalyzing the formation of phosphodiester bonds between the 5' phosphate group of one nucleotide and the 3' OH group of another nucleotide. They are a type of covalent bonds. In this way, the new DNA molecule will have a backbone of repeating units of phosphate-sugar-phosphate-sugar-phosphate

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above