Stem cells produce successive generations of stem cells through the process of:
a. mitosis
b. meiosis
c. differentiation
d. fertilization
e. maturation
a
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__________ produce memory cells when activated.
A. B lymphocytes B. T lymphocytes C. macrophages D. two of the above
Animal cells are embedded in a(n)
a. cell wall. b. extracellular matrix. c. hemicellulose-rich hyaluronan layer. d. pectin-rich basal lamina.
Membrane proteins that help move molecules across the plasma membrane are _______ proteins.
a) channel b) enzyme c) cytoskeleton d) cell recognition
What is a fragile site?
A) an area around the centromere prone to inversion due to gene duplications B) a site in a chromosome prone to duplication, such as the bar gene C) a structural component of a chromosome due to the nucleotide sequence to it that leads to a high percentage of chromosomal breakage D) a structural component of a chromosome due to proteins bound to it that leads to a high percentage of chromosomal breakage E) the telomere of a chromosome can fall off due to spindle malfunctions during meiosis