The leaves of ferns are called
a. epiphytes.
b. stems.
c. fronds.
d. bracts.
e. rhizomes
C
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Burning coal produces sulfur dioxide in the atmosphere. When combined with rain that falls into bodies of water, this leads to
A. no change in the pH level of the water. B. an increase in pH level of the water. C. a decrease in the pH level of the water. D. a greater concentration of OH- ions in the water.
What type of root does ginger use to reproduce asexually?
a. bulb b. tuber c. stolon d. rhizome
Which of the following statements is true of filtration by the kidneys?
a. About 25% of the plasma passing through the glomerulus becomes part of the glomerular filtrate. b. Solutes dissolved in the plasma, such as glucose, amino acids, and various salts, become part of the filtrate. c. The normal glomerular filtration rate adds up to about 80 L every 24 hours. d. Approximately 75% of the filtrate is reabsorbed into the blood through the renal tubules. e. The filtration membrane prevents the passage of cells, but allows large molecules to pass through.
The natural role of restriction enzymes in bacteria is to
A) make conjugation more efficient. B) allow transposons to move to another place in the chromosome. C) protect the cell from invading phages. D) allow cells to accept foreign DNA. E) provide the cell with new phenotypes, such as antibiotic resistance.