According to the endosymbiosis theory, double-membrane mitochondria originated as a result of some larger eukaryotic cells with flexible membranes engulfing smaller prokaryotic cells. which of these explains where the outer layer of the double membrane of the mitochondria originated a. the nuclear membrane of the eukaryotic host b. the plasma membrane of the eukaryotic host c. the ribosomes of the engulfed prokaryotic cell d. the lysosomes of the engulfed prokaryotic cell

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.