What are the units of basic information on chromosomes?
Options:
- (A) colors
- (B) heriditary
- (C) sensory neurons
- (D) Most plants
- (E) Joules
- (F) pollen
- (G) A Greek letter
- (H) photons
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Let's think first: Genes that are located on the same chromosome are called linked genes. Gene A gene is the basic unit of heriditary information. Chromosomes contain the basic units of heriditary information.... So the answer is [(B)]

Bottleneck effect can be a precursor to what?
Options:
- (A) massive damage
- (B) Climate change
- (C) Destroy bridges
- (D) Cambrian explosion
- (E) ground to shake
- (F) clams
- (G) soda
- (H) extinction
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Let's think first: Bottleneck effect occurs when a population suddenly gets much smaller. Population size is the predictor of extinction probability. Bottleneck effect can be a precursor to extinction.... So the answer is [(H)]

Cells that divide uncontrollably may form _.
Options:
- (A) masses of eukaryotic origin.
- (B) masses of neoplastic origin
- (C) cause people to become sick.
- (D) Microscopic organisms
- (E) masses of prokaryotic origin.
- (F) masses of epithelial origin.
- (G) Veins and arteries.
- (H) Wither and die
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Let's think first: Cells that divide uncontrollably may form a tumor, or abnormal mass of cells. Tumor Tumors are masses of neoplastic origin. Cells that divide uncontrollably may form masses of neoplastic origin.... So the answer is [(B)]