Which of the following is correct with regard to adult and embryonic stem cells?
a. Only embryonic stem cells are undifferentiated.
b. Both undergo mitosis and differentiation.
c. Both can differentiate into any type of cell to replace old and worn-out cells.
d. Adult stem cells can only develop into a limited number of cell types.
D
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The human retina has several layers of cells/tissues in the eye. What is the order of appearance of these cells from the front (where light hits first) to the back of the eye?
A. rods and cones; bipolar cells; pigmented epithelium; ganglion cells B. ganglion cells; bipolar cells; rods and cones; pigmented epithelium C. rods and cones; ganglion cells; bipolar cells; pigmented epithelium D. pigmented epithelium; rods and cones; ganglion cells; bipolar cells
Which process explains the evolution of mitochondria and chloroplasts in eukaryotes?
a. Endosymbiosis b. Transformation c. Conjugation d. Transduction
Which of the following statements most likely
apply to the earliest cells?
a. They were prokaryotic cells. b. It is likely that earliest cells did not have a nucleus but had membrane-bound organelles. c. The earliest cells may have used oxygen gas in order to thrive successfully. d. Energy from the sun may have been used by the earliest cells. e. All of these statements most likely apply
Glycogen is used as a major carbon and energy reserve by some archaeons.
Answer the following statement true (T) or false (F)