To be a successful cell evolutionarily, the earliest cells had to:
A) consume oxygen. B) reproduce.
C) have mitochondria. D) photosynthesize.
Answer: B
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The role of a tumor suppressor protein in a cell is to ____
a. promote cell division of healthy cells b. inhibit cell growth and division c. promote cell division of abnormal cells d. trigger DNA replication in preparation for cell division e. serve as a cell receptor for growth factors
Larvacean tunicates feed by means of:
a. a mucus bubble that surrounds them. b. feathery appendages. c. sharp teeth. d. sucking on benthic deposits. e. collar cells.
Energy is commonly defined as "the capacity
to do work." This definition is a. incorrect. b. adequate in the physical sciences. c. adequate in the biological sciences. d. a clue to the actual properties of the concept. e. not accepted by most scientists
Leaf ____ in autumn is an adaptation for flowering plants to survive harsh winters in temperate climates
a. photosynthesis b. desiccation c. abscission d. production e. growth