What molecule is responsible for unzipping the dna strand during replication
a. dna polymerase
b. single strand binding protein
c. dna helicase
d. dna ligase

c. DNA Helicase

Explanation:

Your DNA Helicase is the enzyme that unzippes the DNA strand during replication.  

Your answer is C, DNA Helicase.

DNA helicase is responsible for unzipping the DNA strands during replication, to allow them to be copied.

DNA Polymerase creates new DNA strands by joining nucleotides, sugars, a phosphate groups. It also monitors the base-pairing of the new strand, and proofreads it as well.

DNA ligase seals the gap in the sugar-phosphate backbone, between the lagging strands: short fragments of DNA, called Okazagi fragments.

Hope this helps!

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.