Which of the following biotechnology applications of site-specific recombination deletes DNA from the target?
A. gene activation by removing a transcriptional stop site
B. gene insertion
C. allele replacement
D. gene activation by adding an enhancer sequence
E. gene repression by disrupting transcription with an insertion.
A
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Answer the following statements true (T) or false (F)
1.Neurotransmitters released from a presynaptic cell must travel across a tiny space called a synaptic cleft. 2.The parasympathetic nervous system is responsible for "rest and repose" types of neural activities. 3.Nicotine mimics acetlycholine which causes a release of dopamine. 4.The midbrain responds to all involuntary movements. 5.The same mechanoreceptors control the inner ear for balance and for hearing.
Choose the letter of the best match from the following:A. nitrogenB. calciumC. potassiumD. phosphorusE. magnesiumComponent of ADP, ATP, nucleic acids, and several coenzymes.
Fill in the blank(s) with the appropriate word(s).
Cryptosporidium is an apicomplexian that can contaminate water supplies. Which of the following would you predict to be the case of a Cryptosporidium outbreak?
a. It can only be transmitted by insect bites because it is nonmotile b. It can grow in any water supply because it is photosynthetic c. It will be difficult to treat with chlorine because it forms spores d. It spreads rapidly because it has flagella e. It will enter a person's body through their respiratory tract
An insect population lives along the edge of a north-south mountain range. The populations from the east and west slope eventually join in a low northern pass and interbreed, producing fertile offspring, but they do not circle around the southern edge because of a desert barrier. When glaciers move southward, the populations are pushed south of the northern pass and are isolated. While isolated, the two populations develop enough differences over time that when the glaciers retreat north and the insects again share the same pass, they no longer mate at the same time, nor can they produce fertile offspring. These insects
A. were originally two species and remain two species. B. began as one species and therefore remain one species. C. were originally one species but are now two species. D. were originally two species but are now one species. E. The number of species cannot be determined from the information given.