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.

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.

If an organ has six haploid chromosomes,how many chromosomes are present. 6 12