WHAT HAVE I LEARNED ABOUT TRANSCRIPTION? Identify the following strand fragments of nucleic acids as RNA or DNA.
A. ACCTGGC
D. GGGUGG
B. AAGCCUU
E. UCGAUC
C. TTCCGAA
F. ATTGCCT
Describe the three main differences between RNA and DNA?

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms

19. a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. which phase of mitosis is the cell most likely in? a. metaphase b. prophase c. telophase d. anaphase

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d