Which of the following is abundant in a plant cell wall that can be degraded by fungus and termites?
a. actin
b. tubulin
c. cellulose
d. starch
e. chitin
Answer: c. cellulose
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Although choanoflagellates are fundamentally unicellular organisms, they possess the genes that code for cadherins and integrins
Which of the following hypotheses regarding the function of these molecules in choanoflagellates is supported by laboratory experiments? A. Choanoflagellates use adhesion molecules to facilitate the capture of bacterial prey. B. The genes are not actually expressed and are simply vestiges of an ancestor that used cadherins and integrins for adhesion. C. Cadherins and integrins are used for cell adhesion during the formation of temporary multicellular structures to defend against predators. D. Cadherins and integrins are used for cell adhesion during the formation of complex multicellular structures that are resistant to freezing temperatures. E. Choanoflagellates are parasites and use cadherins to attach to host organisms.
Which is a pancreatic protease?
a. pepsin b. trypsin c. amylase d. pepsinogen e. lipase
In order for a cell to maintain a high degree of order, it must constantly:a
use energy. b. produce energy. c. destroy energy. d. release energy. e. increase energy.
Why does urine frequently have an acidic pH?
A. The kidneys filter and excrete H+ from the blood. B. The kidneys absorb H+ ions and excrete bicarbonate ions. C. The kidneys produce H+ in the process of filtering the blood. D. The blood has an acidic pH and the kidneys produce urine similar to the pH of the blood. E. There is a high concentration of hydrochloric acid (HCl) in the urine, making it highly acidic.