Which of these observations gives the most support to the endosymbiotic theory for the origin of eukaryotic cells?
A) the existence of structural and molecular differences between the plasma membranes of prokaryotes and the internal membranes of mitochondria and chloroplasts
B) the similarity in size between the cytosolic ribosomes of prokaryotes and the ribosomes within mitochondria and chloroplasts
C) the size disparity between most prokaryotic cells and most eukaryotic cells
D) the observation that some eukaryotic cells lack mitochondria
B
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The hydrogen-bond lattice causes water to have an unusually ____ specific heat and an unusually ____
heat of vaporization for its molecular weight.
a. high; high b. low; high c. high; low d. low; low
Which of the following foods contain hydrogenated vegetable oil? a. Crackers b. French fries c. Cookies d. All of these choices
e. Peanut butter
Match the infectious agent on the left with the appropriate cancer type on the right
A) stomach cancer B) Burkitt's lymphoma C) liver cancer D) cervical cancer E) bladder cancer 1) Epstein–Barr virus 2) hepatitis B virus 3) human papilloma virus 4) Helicobacter pylori 5) parasitic flatworms
Membrane phospholipids
A) have hydrophobic heads that face the center of the membrane and are shielded from water. B) have hydrophilic tails that face outward and are exposed to water. C) are able to drift about in the plasma membrane. D) remain fluid because they are tightly packed against one another.