There are altogether ____________________ codons that code for amino acids in the genetic code. Fill in the blank(s) with the appropriate word(s)
ANS: 61
Biology & Microbiology
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The oxygen in Earths atmosphere:
a. was manufactured inside stars. b. was added to the atmosphere by plant life. c. has grown more abundant since the origin of Earth. d. all of these e. none of these
Biology & Microbiology
In eukaryotic cells, which can occur during the stages
of mitosis? a. the duplication of chromatids b. the replication of DNA c. synapsis and crossing over d. fragmentation and disappearance of nuclear envelope e. all of these
Biology & Microbiology
Archaeopteryx is a transitional form between
a. birds and mammals. b. mammals and reptiles. c. birds and reptiles. d. fish and amphibians. e. amphibians and reptiles.
Biology & Microbiology
Epinephrine is secreted by
a. pancreatic islet cells. b. the thyroid gland. c. the pituitary gland. d. the adrenal medulla. e. the adrenal cortex.
Biology & Microbiology