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.

Biology & Microbiology

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Endospores are dormant and require no nutrient or energy.

a. true b. false

Biology & Microbiology

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.

Biology & Microbiology

Which hormone is secreted by the pancreas to lower high blood glucose levels?

A. adrenaline B. insulin C. glycogen D. glucagon E. antidiruetic hormone

Biology & Microbiology

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

Biology & Microbiology