What is the purpose of dna polymerase? a) it carries genetic information to the ribosomes. b) it produces a complementary copy of a strand of dna. c) it constructs rna chains using a template from dna genes. d) it retrieves amino acids from the cytoplasm for protein construction.

The correct answer would be B) It produces a complimentary copy of a strand of DNA.  

DNA polymerase is an enzyme that catalyzes the polymerization of deoxyribonucleotides.

It helps in the synthesis or replication of DNA by producing the complimentary copy of a strand of DNA.  

It requires RNA primer to initiate the replication process as it can add nucleotide only in 3' to 5' direction.  

The overall chemical reaction can be written as:

⇄

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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the dark variety, as they are not visible on the dark tree barks

explanation: