Which of the following is NOT one of the 5 general steps of biotechnology?
Amplify a small amount of DNA
Chop up DNA from a donor species
Identify colonies that have received DNA containing the gene of interest
Grow separate colonies containing different inserted pieces of donor DNA
Insert different DNA segments into human cells to be grown and studied
Insert different DNA segments into human cells to be grown and studied
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What branch of chemistry deals specifically with living systems?
A) organic chemistry B) inorganic chemistry C) biochemistry D) biological chemistry E) both choices C and D
Which of the following is true for restriction enzymes?
A. A given restriction enzyme will always recognize the same DNA sequence, but it will cut differently depending on the species of origin of the DNA. B. Each restriction enzyme known is able to make a staggered cut at its recognition site. C. Any restriction enzyme can cut any piece of DNA. D. A different restriction enzyme must be used to open the vector DNA than to excise the gene sequence to be cloned. E. Restriction enzymes are useful in genetic engineering when they make staggered cuts in DNA
Ion concentration differences produce an action potential creating a signal. The difference between a weak signal and an intense signal is
A. weak stimuli only open sodium gates, strong signal also open potassium gates. B. the frequency at which an axon fires. C. the action potential is graduated and a weak signal causes a small change in polarity. D. a strong signal does not allow repolarization but sends a constant flow of ions. E. All of the choices are correct.
The refractory period of an action potential
A. has no effect on direction of action potential propagation. B. allows bidirectional flow of the action potential. C. prevents flow of action potential towards cell body. D. is not a component of every action potential.