Biology 1406 EXAM 2 questions n answers rated A+

Biology 1406 EXAM 2 questions n answers rated A+ In a closed system from which no energy can be removed and to which none can be added from outside, - correct answer Potential energy decreases, and entropy increases Catalysts essentially equal to enzymes but made of RNA are - correct answer ribozymes Which cellular component is responsible for the regulation of exchanges of substances between a cell and its environment? - correct answer the cell membrane Cells with greater than diploid chromosome numbers, as is the case for megakaryocytes, are: - correct answer polyploid The process by which a eukaryotic cell engulfs solid nutritive substances, such as bacteria is called - correct answer phagocytosis The bulk of the plasma membrane is a bilayer of - correct answer phospholipid Which organelle is NOT surrounded by its own two membranes? - correct answer vacuole The characteristics that are associated with living systems first appear at the organizational level of the: - correct answer cell Microfilaments participate in the formation of - correct answer daughter cells When certain protein molecules extend through the cell membrane they form passages known as: - correct answer channels A cell takes up or eliminates many kinds of molecules against a concentration gradient by means of - correct answer active transport