The white cliffs of Dover, England are composed of the fossilized remains of:
1.diatoms
2.foraminifera
3.euglenoids
4.radiolarians
2
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If the infecting phage lacks some critical pieces of DNA necessary for replication, it is called
A. incomplete. B. mutated. C. defective. D. vegetative.
The minimum sterilizing conditions in a steam autoclave are
A. 160°C for 2 hours. B. 71.6°C for 15 seconds. C. 121°C at 15 psi for 15 minutes. D. 100°C for 30 minutes. E. 63°C for 30 minutes.
Proteins are essential parts of all structures and biological processes in cells
a. True b. False
Cell differentiation can be defined as ___________________.
A. protein synthesis B. different cell lineages expressing different subsets of their genes during development C. all cell lineages expressing the same genes during development D. different cell lineages expressing all subsets of their genes during development E. different genomes present in different cell lineages