What is an area of the Earth's surface currently undergoing primary succession?
A. Shallow seas with low productivity
B. Volcanoes in Iceland
C. Redwood forests along the northwestern U.S. coast
D. Old orange groves in Florida
Answer: B
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When you go to your supervisor to give your diagnosis, which of the following hypotheses do you present to support it?
ALD is a fatal disease that results from a lack of peroxisomes in the liver. It is diagnosed by the presence of high levels of very long-chain fatty acids in the blood. The disease results in destruction of brain myelin leading to progressive cognitive impairment, coma, and death by the age of 14. There has never been a case of ALD described in girls. You have just started your internship at the Mayo clinic and a 10-year-old girl comes in who is in a coma and having seizures. Blood tests show she has extremely elevated levels of long-chain fatty acids. This looks like ALD, but a girl has never been afflicted. A. Both her mother and father are recessive carriers of ALD. B. Most of the Barr bodies in her liver have a normal peroxisome gene. C. Her mother is a carrier for ALD. D. She has Turner syndrome. E. Her mother is a carrier, and she could have genetically normal Barr bodies in the liver or Turner syndrome.
During the process of cloning, a small circular DNA molecule that has been modified is inserted into a bacterium for replication. What is this molecule known as?
a. gene b. allele c. plasmid d. enzyme
The replisome has two main subcomponents. They are
A. the replication folk and the DNA pol III enzymes. B. the primosome and the DNA pol III enzymes. C. the DNA pol III enzymes and the sliding clamp subunits. D. the primosome and the sliding clamp subunit. E. the replication folk and the sliding clamp subunit.
Which of these is the second of the three stages of cell signaling?
-gene activation -reception -binding of a neurotransmitter to a plasma membrane receptor -transduction -cell response