A DNA molecule that transports foreign DNA into a cell is called a
A. clone.
B. vector.
C. nanosphere.
D. mutagen.
Ans: B. vector.
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The definitive identification of which of the following organisms is accomplished by hemad-sorption techniques?
a. Chlamydia trachomatis b. Mycoplasma hominis c. Mycoplasma pneumoniae d. Mycoplasma genitalium
Why is water not able to dissolve or break down oil? a. Water is polar and oil is nonpolar
b. Water is polar and oil is polar. c. Water is nonpolar and oil is nonpolar. d. Water is nonpolar and oil is polar.
Which of the following is a nucleotide?
A) adenine + deoxyribose B) sugar + nitrogenous base C) adenine + ribose + phosphate D) phosphate + ribose
Mycorrhizal fungi are sometimes purposely introduced to new areas of land that are used for growing plants for commercial uses (e.g., landscaping, crop production, timber production). What would be the benefit of doing this?
A) The fungi absorb toxic pesticides from the ground. B) The fungi help facilitate horticulture, agriculture, and forestry. C) The fungi promote the evolution of new fungus species. D) The fungi prevent competitive plant species from growing.