Multiple choice: 1)  passive transport is controlled by a process called a.    osmosis b.    endocytosis c.      catalysis d.    diffusion 2)  which organelle is the site of protein synthesis? a.    nucleus b.    ribosome c.      mitochondria d.    plastid 3)  during the oxygen combines with hydrogen and produces water. a.    light reactions b.    krebs cycle c.      electron transport chain d.    calvin cycle 4)  after a plant cell pumps protons into a confined space between two membranes of the cell, which process of diffusion uses an enzyme to produce atp? a.    osmosis b.    phosphorylation c.      fermentation d.    the calvin cycle 5)  which of the following is an organelle that contains its own dna, and may have descended from prokaryotes that became incorporated into eukaryotic cells? a.    ribosome b.    mitochondria c.      vacuole d.    endoplasmic reticulum 6)  what are the only two types of stem cells named in a lesson you are reviewing?   a.    embryonic stem cells and induced pluripotent stem cells b.    fetal stem cells and cord blood stem cells c.      somatic stem cells and induced pluripotent stem cells    d.    adult stem cells and embryonic stem cells 7)  when there is no oxygen present, what processes supply cells with some energy to continue functioning? a.    aerobic respiration b.    the electron transport chain      c.      fermentation d.    homeostasis 8)  there are channels in the cell membrane that allow particular things to pass through them. this type of passive transport is referred to as a.    endocytosis  b.    facilitated diffusion c.      exocytosis d.    glycolysis 9)   during a cell uses energy to transport materials. a.    diffusion b.    facilitated diffusion c.      osmosis d.    active transport 10)  the oldest fossils of living organisms contain which type of cell, which is the earliest cell type scientists have discovered? a.    prokaryotic b.    plantae c.      eukaryotic