When only one nucleotide base is involved in a mutation, this is called
A. chromosomal mutation.
B. template error.
C. point mutation.
D. nonsense codon.
C. point mutation.
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A red blood cell was placed in a beaker of solution. The cell immediately began to swell and
ultimately burst. This happened because the cytoplasm of the cell was ____ to the solution in the beaker which was ____.
a. hypertonic; hypotonic b. hypotonic; hypertonic c. hypotonic; isotonic d. hypertonic; isotonic e. isotonic; hypotonic
Ectothermic animals:a
depend on heat from the external environment to adjust their body temperatures. b. may dilate blood vessels to increase blood flow and heat to the skin. c. maintain a relatively constant body temperature despite external temperatures. d. may have feathers to keep them insulated. e. may have body fat to keep them insulated.
In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because
A. each hormone can bind to multiple receptors simultaneously causing amplification of the signal. B. the signal is amplified by activation of transcription factors that each catalyze multiple reactions. C. the hormone triggers the cell to release more hormones, amplifying the signal. D. the signal is amplified by activation of enzymes that each catalyze multiple reactions. E. each hormone can bind to transcription factors simultaneously causing amplification of the signal.
When the homologous chromosomes separate during meiosis I, each daughter nucleus receives
What will be an ideal response?