What type of cancer causes the most deaths in males?
A. colon and rectum
B. pancreas
C. lung and bronchus
D. esophagus
E. prostate
Answer: C
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The guard cells that surround stomata are specialized
a. endodermal cells. b. parenchyma cells. c. mesophyll cells. d. collenchyma cells. e. cortex cells.
In combination with homologous recombination, the CRISPR/Cas system can be used to accomplish
A) gene fusions. B) gene deletion. C) point mutations. D) DNA cloning. E) gene fusions, gene deletions, or point mutations.
Which of the following statements about the nitrogen cycle is true?
A) The nitrogen cycle requires different types of bacteria. B) Nitrogen gas is converted to nitrates in plant leaves. C) Nitrogen cannot be cycled through living organisms. D) When plants and animals die, nitrogen is removed from the nitrogen cycle
A common source of antibiotics is
A) Acetobacter. B) Aspergillus oryzae and Lactobacillus. C) Lactoccocus cremoris. D) Streptococcus thermophilus. E) Streptomyces.