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

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measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.