In which of the following ways does the plasma membrane regulate the entry of molecules into a cell? a) the membrane allows only certain molecules to movie into the cell b)the membrane destroys most molecules so that they do not enter the cell c) the membrane changes only certain molecules into ions before they move into the cell d)the membrane allows most molecules to transfer energy into the cell without entering the cell

Prior to the development of dna fingerprinting, blood type could be used to determine possible parentage. although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. which of the following is a true statement that can be made about parentage based on blood typing?

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.