Two noncellular agents, smaller than viruses, are the infectious proteins called ________, and the infectious RNA strands called ________.
Fill in the blank(s) with the appropriate word(s).
prions; viroids
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Four of the five organelles listed below are part of the endomembrane system. Select the exception
a. smooth ER b. peroxisomes c. Golgi bodies d. vesicles e. mitochondria
Which of the following is the purpose of identifying biodiversity hotspots?
a. focusing conservation on areas with high numbers of endemic species b. establishing sanctuaries for migratory birds that are nearing extinction c. preventing habitat destruction caused by the timber and palm oil industries d. reintroducing species to newly restored ecosystems and habitats
In PCR, heating of the DNA is necessary because:
A) it causes the primers to bind DNA. B) it separates the two strands of DNA. C) DNA polymerases require high heat to work. D) it cuts the DNA into fragments small enough to be replicated.
Which is NOT true regarding replication of Escherichia coli?
a. When growing optimally, a generation time of 20 minutes can be achieved. b. It takes 40 minutes to replicate the chromosome. c. Multiple replication forks allow for growth faster than the genome replication time. d. Unidirectional replication of the chromosome occurs to allow rapid growth.