What is the difference between a totipotent stem cell and a pluripotent stem cell? What piece of evidence would you
need to distinguish them? What will be an ideal response?
A totipotent stem cell has the potential to develop into an entire organism. A pluripotent cell
has the potential to develop into any cell of the body. To determine whether a cell is
totipotent, experiments must show that the cell is able to direct the development of an entire
organism.
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Combinatorial control refers to the fact that:
A. each gene has its own unique enhancers found nowhere else on that chromosome. B. each gene has a unique combination of thousands of different enhancers. C. each gene has a unique combination of several different enhancers. D. each gene has a unique combination of several enhancers plus several dozen regulatory transcription factors. E. each gene has a unique combination of several regulatory transcription factors, each of which can combine with up to three dozen transcriptional complexes.
Match the following items with the correct phrases.
_______1. ____________________ are also known as immunogens. _______2. Molecules referred to as antigenic determinants are also known as ____________________. _______3. ____________________ are in a class of proteins called immunoglobulins. _______4. Small molecules called ____________________ are antigenic only when then are coupled with large carrier molecules such as proteins. _______5. ____________________ initiate type III hypersensitivity reactions. a. antibodies b. antigens c. epitopes d. haptens e. immune complexes
Endospores are dormant and require no nutrient or energy.
a. true b. false
Which hormone is secreted by the pancreas to lower high blood glucose levels?
A. adrenaline B. insulin C. glycogen D. glucagon E. antidiruetic hormone