What happens during the transcription?

a. mRNA is formed by copying a gene on one of the DNA strands
b. mRNA is doubled as it copies the genes on both sides of the DNA
c. DNA is doubled
d. amino acids are brought to the mRNA to construct a new strand

a). mRNA is formed by copying a gene on one of the DNA strands

Explanation: Transcription is a process in which the nucleotide sequence in one strand of a double stranded DNA is converted to an mRNA. The genetic information in a DNA is copied into an mRNA. The mRNA produced is not the same with the DNA in base composition and sequence rather the mRNA is complementary to the DNA strand. In DNA, adenine, guanine, cytosine and thymine are found but in the mRNA adenine, guanine, cytosine and Uracil are found. In mRNA base pairing, adenine pairs with uracil while guanine pairs with cytosine.

tissue

explanation:

it is actually formed by geoup of cells which is tissue

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.