Where is heterochromatin not commonly located?
A. telomeres
B. centromeres
C. silenced X chromosomes
D. gene-poor regions of chromosomes
E. chromosomal regions carrying genes that encode ribosomal proteins
Answer: E. chromosomal regions carrying genes that encode ribosomal proteins
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Stromatolites are
A. layered rocklike structures formed by cyanobacteria. B. the earliest known arthropods. C. autotrophs living around deep sea vents. D. heterotrophs found in marine environments. E. fossilized coral reefs.
Instinctive behaviors are ____, while learned behaviors are ____
a. acquired from observation; acquired from practice b. taught by parents; acquired from trial and error c. incomplete the first few times they are displayed; apparently a product of reason d. genetically programmed responses; dependent upon experience e. dependent upon experience; genetically programmed responses
Alcohol is detoxified in organelles called ________
Fill in the blank(s) with correct word
Which of these is an organ of the urinary system?
a. Prostate gland b. uterus, c. rectum, d. kidney