The division of the cell's cytoplasm in a eukaryotic cell is known as:
A. cytokinesis.
B. cell fission.
C. mitosis.
D. Answers a and c are both correct.
A
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Small amounts of hormones have large effects on an organism's physiology because the signals are amplified between glands and tissues in an endocrine axis and within the second messenger systems of individual cells
A. true B. false
Which of the following is a difference between a viroid and a virus?
A. Viroids are alive and viruses are not. B. Viroids are composed solely of nucleic acid while viruses are composed of nucleic acid surrounded by a protein coat. C. Viroids are not infectious particles and viruses often cause disease. D. Viroids infect only plants while viruses infect only animals and prokaryotes. E. Viroids contain some genes important for their own replication while viruses rely entirely on host cell enzymes for their replication.
The isotope 14C undergoes radioactive decay with a neutron splitting into an electron and a proton
This decay produces an atom of
a. iron. b. carbon. c. hydrogen. d. oxygen. e. nitrogen.
As rainfall in an African savanna decreases, it would most likely change into
A. tiaga. B. desert. C. tropical rainforest. D. temperate forest. E. tundra.