9. Number the statements below in proper order. _Amino acids are brought to the mRNA/ ribosome complex by tRNA.

_The DNA code is copied onto a single strand of mRNA by RNA polymerase.

_The completed polypeptide chain separates from the ribosome.

_The DNA double helix "zips” closed.

_mRNA forms a complex with a ribosome.

_tRNA attaches to an amino acid.

_Peptide bonds form between adjoining amino acids.

_The DNA double helix "unzips."

_mRNA leaves the nucleus and enters the cytoplasm.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

"do a testcross with a homozygous recessive plant."

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.