What is the unique thing about stem cells that makes them so desirable for therapeutic use?
a) they can divide forever and never go through apoptosis
b) they develop into nerve cells and can be used by stroke victims
c) they can develop into many different tissue types
d) they develop into organs needed form transplant
e) they are found in reproductive tissue
Ans: c) they can develop into many different tissue types
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The microtubule organizing center (MTOC) of an animal cell is an identifiable structure known as the ____
a. cell plate b. centrosome c. kinetochore d. centromere e. chromosome
Scientists agree that life originated on Earth
Indicate whether the statement is true or false.
Which of the following was determined by
Watson and Crick?
a. the amount of adenine in a DNA molecule equals the amount of thymine b. DNA is a double helix c. DNA has a phosphate backbone d. the sequence of DNA bases is different in different organisms e. none of these were determined by Watson and Crick
Which of the following choices correctly identifies a reactant in the following chemical equation?
CO2 + H2O ? H2CO3 a. carbonic acid b. oxygen c. water d. sugar e. carbon monoxide