What is mrna? (gradpoint)
a. an rna segment rhat does not code for proteins
b. a dna sequence at the start of a gene
c. a dna strand that cannot be transcribed
d. an rna copy of a dna gene

plz explain if can

Plz genetic engineering can be applied to many fields including medicine and agriculture. which of the following is a medical application of genetic engineering? a. giving crop plants recombinant dna so that they would be resistant to herbicides. b. examining a persons pedigree to determine whether they can carry a gene for a genetic disease. c. analyzing a persons dna to see how closely they are related to another person. d. certain genes into bacteria so that they will produce a needed medicine.

Acell in the human nervous system whose primary function is to form myelin and the blood-brain barrier, respond to injury, remove debris, and enhance learning and memory is called a(n) cell.

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs