Which statement about the cell membrane is true?
it contains cellulose and sugars that are involved in communication.
it is present in animal cells only.
it is rigid and elastic for supporting the cell's shape.
o it prevents harmful substances from entering a cell.

What is the importantence of the carbon and nitretan cycles in the environment

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.

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.