What is the hallmark of dichotomous keys?
a. They are open-ended questions.
b. They only relate to biochemical processes of the cell.
c. They consist of a series of paired statements, in which only one statement of each pair applies to a given organism.
d. They only relate to the shape of the cell.
Answer: c. They consist of a series of paired statements, in which only one statement of each pair applies to a given organism.
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The majority of the water in xylem sap typically ____
a. is used in capturing light energy b. becomes part of new plant cells c. is used to make sugars d. is stored in older plant cells e. evaporates into the air
Which type of molecule is ricin?
a. protein b. lipid c. nucleic acid d. carbohydrate e. mineral
After obtaining DNA fragments by PCR, the fragments are ____ to reveal the lengths of the short tandem repeats
a. separated by a centrifuge b. viewed under a microscope c. separated by an electric current d. inserted into a plasmid e. chopped up using restriction enzymes
The dashed line in the accompanying figure represents a(n) ____
a. covalent bond b. ionic bond c. hydrogen bond d. polar covalent bond e. hydrophobic interaction