On the Phet site go to to Molecule Polarity at https://phet. colorado. edu/en/simulation/molecule-polarity 2. Starting with two atoms make the electronegativity equal at less. At View box select all the choices, on the Surface box select Electrostatic Potential, leave the electric field box off. Increase the electronegativity of atom A. a. What happens to the bond character? It becomes more ionic.
b. Charge?
c. Bond Dipole?
d. If you could see the electrons where would they be ie what happens the electron density as you increase the electronegativity of A?

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

a) adding base pairs

c) unwinding the helix

there are possible two correct answers for this question.

dna polymerase doesn’t add base pairs, it adds single nucleotides which are complentar to coding strand . also dna polymerase can’t unwind the dna helix alone. dna helicase can do that, using energy derived from atp hydrolysis.

dna polymerase are enzymes that synthesize dna molecules from deoxyribonucleotides. these enzymes replicate the dna strand and create two identical dna strands from a single original dna molecule. some of dna polymerases have a function of correcting erros which are made during replication and this process is called proofreading. if the dna polymerase detects that incorrectly paired nucleotide has been added, it will remove and replace the wrong nucleotide.