What process recycles molecules from inorganic areas to living parts of an ecosystem?
A) commensalism
B) introducing new species
C) nutrient cycling
D) competitive exclusion
C
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Which of the following is NOT a checkpoint that controls the progression of the cell cycle?
A. Cyclins and cyclin-dependent kinases are proteins that are responsible for advancing a cell through the phases of the cell cycle. B. The G2 checkpoint checks for DNA damage and determines if all of the DNA is replicated. C. The metaphase checkpoint determines if all chromosomes are attached to the spindle apparatus. D. Cytokinesis involves the formation of cleavage furrow to separate the cells. E. The restriction point determines if conditions are favorable for cell division and if the DNA is undamaged.
Early animal embryos are composed of stem cells, unspecialized cells that are capable of dividing and renewing themselves for long periods
If a stem cell divides by mitosis so that one cell eventually becomes part of the brain and the other cell becomes part of a salivary gland, the cells have A) differentiated. B) diffused. C) taken up genes from surrounding cells. D) lost genes. E) increased their genetic variability.
The dried residues of fine droplets from mucus or saliva that harbor and transmit pathogen are
A. fomites. B. mechanical vectors. C. droplet nuclei. D. biological vectors. E. aerosols.
Which of the following intermediary metabolites enters the Krebs Cycle and is formed, in part, by the removal of carbon from one molecule of pyruvate?
A. CO2 B. pyruvate C. NADH D. acetyl CoA