Which of these stages were a focus of study for Miller and Urey in their FIRST experiment?
Study of the origin of life has resulted in the breakdown of cellular development into overlapping stages, beginning with the synthesis of precursor molecules for the synthesis of nucleotides and amino acids and ending in polymers enclosed in membranes acquiring cellular properties.
A. Stage 1: Nucleotides and amino acids were produced prior to the existence of cells.
B. Stage 2: Nucleotides became polymerized to form RNA and/or DNA, and amino acids became polymerized to form proteins.
C. Stage 3: Polymers became enclosed in membranes.
D. Stage 4: Polymers enclosed in membranes acquired cellular properties.
E. Stage 5: Ribosomes were developed inside the membrane.
A. Stage 1: Nucleotides and amino acids were produced prior to the existence of cells.
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The protective layer outside of the plasma membrane of the plant cell is called ______
A. chitin B. proteoglycans C. pectin D. the cell wall E. cellulose
Before Mendel, most people would have predicted that a cross of a red rose with a yellow rose would
produce ____. A. all red roses B. all yellow roses C. all orange roses D. about half yellow roses and half red roses E. about three-fourths red roses and one-fourth yellow roses
Which of the following factors may be directly responsible for maintaining a sharp edge between prairies and forests in the midwestern United States?
A) summer drought B) low winter temperatures C) tornadoes D) fire
Disinfecting agents naturally produced by microorganisms are
A) aldehydes. B) antimicrobials. C) halogens. D) quats. E) triclosans.