What are the smallest projections of the small intestine wall?
A. Microvilli
B. Cilia
C. Villi
D. Brush border cells
E. Duodena
Answer: A
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Match the following items with the correct phrases.
_______1. The “building blocks” are held together by glycosidic bonds. _______2. Composed of “building blocks” that contain phosphorous. _______3. Polymers that are composed of amino acids. _______4. Enzymes are examples. _______5. Cellulose, glycogen, and starch are examples. _______6. The “building blocks” are held together by peptide bonds. a. polypeptides b. polysaccharides c. nucleic acids d. substrates
Soils of tropical rain forests are poor in carbon
mostly because of a. the rapid decomposition and uptake of organic matter. b. leaching. c. the high humidity. d. the high temperature. e. the rapid rate of photosynthesis.
Saliva contains the hydrolytic enzyme, salivary amylase, which initiates the breakdown of the polysaccharide ________ into the disaccharide, maltose.
A. starch B. glucose C. cellulose D. fructose E. sucrose
Evidence exists that atmospheric CO2 has increased over the last several decades, due to human activities. How could increased CO2 levels affect the pH of Earth's waters?
a. Due to the formation of carbonic acid, increased CO2 levels will increase the pH of Earth's waters. b. Due to the formation of carbonic acid, increased CO2 levels will decrease the pH of Earth's waters. c. Due to the formation of carbonic acid, increased CO2 levels will cause Earth's waters to become neutral. d. It will not affect the pH of Earth's waters, as atmospheric CO2 is not located in oceans.