The important paper by Hahn and Weinberg extended the early studies from their lab and others in which mouse 3T3 cells were found to be transformed by single oncogenes (like mutant ras). What was the key difference in their experimental system that led them to conclude that at least 3 changes (expression of telomerase, presence of an oncogene like mutant ras, and decreased function of p53/Rb via SV40 Large T antigen) were required to transform non-immortalized cells

Every compound can be represented by a chemical formula. a chemical formula is the set of symbols showing the elements that make up a compound and their proportions. water’s chemical formula is h 2 2 o. that means a molecule of water contains two atoms of hydrogen and one atom of oxygen chemically bonded. a molecule is a group of two or more atoms bonded together. molecules can range in size from two to thousands of atoms. a molecule of a compound is the smallest unit of that compound. every molecule of water has all the physical and chemical properties of water. that’s because every molecule of water is made of the same elements in the same proportions: two hydrogen atoms and one oxygen! which of the following is a true statement? a every molecule of the same compound will have different properties. b every molecule of a compound has the same proportion of elements. c molecules can be physically separated into smaller units of a compound. d molecules cannot be represented by chemical formulae.

What prevents odyssey from killing the sleeping cyclops

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?