How is a stem cell different from a "normal" somatic cell? (Use a liver cell as an example.)
What will be an ideal response?
A "normal" cell has differentiated and is expressing specific genes related to a particular cell type and has turned off genes unrelated to its function. Stem cells have yet to differentiate and have the potential to express any genes they have, depending on the environment they are in.
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Which of the following statements about the causes of extinction are true? Check all that apply.
_____ Probability of extinction varies inversely with population size. _____ Ten 10-hectare habitat patches is not the same as one 100-hectare patch. _____ Habitat loss is currently the major cause of extinction. _____ The prehistoric megafauna of North America were spared from extinction because they coevolved with humans. _____ Probability of extinction is greatest for an endemic species.
The earliest hominin fossils are found in
a. Africa. b. Asia. c. Australia. d. the South Pacific. e. Europe.
________ chromosomes pair during ________ of meiosis
Fill in the blank with correct word.
Homeostasis
What will be an ideal response?