Chapter 4 Genes and DNA. Section 1+2 Pages 84-101. What does DNA look like?. Pieces of the Puzzle: DNA must be able to give instructions for building and maintaining cells. DNA must be able to be copied each time a cell divides, so each cell contains identical genes. .
Messenger RNA copies the coded message from DNA in the nucleus , and carries the message to the ribosome in the cytoplasm.
transfer RNA (tRNA) deliver amino acids from the cytoplasm to the ribosome.
Transfer RNA (tRNA) transfers amino acids to the ribosome and adds them to the growing protein.
are dropped off
at the ribosome.
contains uracil instead of thymine
A, G, C, U
A, G, C, T
Clone: a new organism that has an exact copy of another organism’s genes.
Inbreeding: cross two genetically similar (male/female plump turkey)
Hybridization: cross two genetically different (mcintosh and red delicious apple to get an empire)