Which evolutionary innovation was most significant in helping tetrapods move to dry terrestrial environments?
A) the lung
B) the amniotic egg
C) bone
D) limb specialization
E) endothermy
Answer: B
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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.
An organism can exchange matter and energy with its surroundings. Thus, any change in an organism's
energy content must be balanced by a corresponding change in the energy content of the surroundings. As such, an organism is referred to as: a. a closed system. b. an open system. c. a dynamic system. d. a thermally reactive system. e. a potential system
Enzymes that alter another protein or enzyme's activity by attaching a phosphate group are called:a
kinases. b. phosphatases. c. phosphators. d. transcription factors. e. coenzymes.
Bacteria requiring very specific growth factors to survive are classified as __________ bacteria
Fill in the blank(s) with the appropriate word(s).