A scientist isolates a single-celled organism from the bottom of a sulfur hot spring. When examined under the microscope, it is clear that the cell is very small and contains no nucleus. Based on this evidence alone, in what domain of life is this organism?
A. Eukarya.
B. Bacteria.
C. Archaea.
D. Either bacteria or archaea.
E. It is impossible to determine anything based on this evidence alone.
D. Either bacteria or archaea.
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During morphogenesis
a. cells divide. b. cells grow. c. cells migrate. d. tissues fold over. e. all of these occur.
Which of the following can be said to occur during every energy transformation?
a. A change occurs in the free energy of the universe. b. The entropy of the universe increases. c. A change occurs in the total energy of the universe. d. The entropy of the universe decreases.
Which cells aid in the operation of the nervous system but are unable to conduct nerve impulses?
A. goblet cells B. neuroglia C. intercalated disks D. neurons
The key differences between cell types that allows them to be differentiated from one another are ________, the result ofÂ
A. the rate of gene expression in different cell types; varying density of RNA polymerase to produce more mRNA in some cells than others. B. the amount of protein present in different cell types; varying density of ribosomes to produce more polypeptides in some cells than others. C. the proteins being produced in each cell type; transcription factors regulating which genes are expressed and their level of expression. D. the DNA present in the nucleus of each cell type; differential sorting of chromosomes during mitosis when the cells are dividing.