If you carve your initials in the trunk of a tree, will they move up as the tree grows?
A) Yes. A tree elongates from the ground up.
B) Yes. Secondary growth will cause them to move up.
C) No. Elongation occurs just below the tips of growing stems in the apical meristems.
D) No. Secondary growth continues in all parts of a plant throughout its life.
Answer: C
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The ____________________ are vessels that drain blood from capillary beds. Fill in the blank(s) with the appropriate word(s)
Which one of the following is TRUE regarding nucleotides?
A) There are three different DNA nucleotides. B) DNA nucleotides are assembled into RNA by the process of dehydration synthesis. C) DNA nucleotides contain deoxyribose; RNA nucleotides contain sucrose. D) Nucleotides are bonded together by covalent bonds between the sugars and the phosphates. E) A DNA nucleotide could be made up of ribose, a phosphate, and cytosine.
The first heart sound (lub) is produced by the closing of the ____ and ____ valves
a. aortic semilunar; pulmonary semilunar b. right atrioventricular; aortic semilunar c. left atrioventricular; pulmonary semilunar d. right atrioventricular; left atrioventricular e. mitral; left atrioventricular
Tissues of sharks are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes
What can you infer about the movement of sodium and chloride in these animals? A) To maintain homeostasis of sodium and chloride levels, the shark must take up additional sodium and chloride from seawater. B) Sodium and chloride will diffuse into shark gills from seawater down their concentration gradient. C) Sharks conserve sodium and chloride, limiting excretion. D) Sodium and chloride must be eliminated through the gills.