The rate at which mitosis occurs varies dramatically for different types of cells. The most rapid cell division occurs:
a) in the blood and the heart.
b) on the skin.
c) in the gametes.
d) in the blood and the cells lining the various tissues of organs.
e) in the liver and the brain.
Ans: d) in the blood and the cells lining the various tissues of organs.
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Plants exposed to multiple threats, such as herbivory and pathogens, are often more highly defended and grow at a faster rate than those that are exposed to individual threats
A. true B. false
A major explosion of animal diversity in which all major marine lineages were formed took place during which period?
a. Cambrian b. Carboniferous c. Devonian d. Permian e. Proterozoic
A diploid cell only has two copies of most genes, but can make hundreds of copies of a protein from those genes per second because
A. the DNA can replicate during transcription, producing double-sided mRNA to accelerate the translation process. B. transcription can repeat and make multiple mRNA copies of genes, and multiple ribosomes can translate the same mRNA. C. multiple ribosomes can actively attach to the template DNA and conduct translation immediately after transcription. D. multiple copies of the same mRNA can be produced with multiple promoter sequences to simultaneously initiate multiple ribosomes. E. multiple codons can encode for the same amino acid, allowing different versions of the protein to be made.
In bone, crystals of calcium phosphate impregnate the extracellular matrix containing fibers of
A. myosin. B. actin. C. collagen. D. troponin. E. chitin.