Which process uses proteins to move molecules against a concentration gradient?
A.) active transport
B.) passive transport
C.) endocytosis
D.) phagocytosis
Ans: A.) active transport
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Which form of organization is classified between cell and organ?
a. atom b. molecule c. compound d. organelle e. tissue
Which of the following traits is determined by programmed transposition?
A) Pattern baldness in humans B) Mating types in yeast C) Eye color in Drosophila D) All of these E) None of these
Phospholipase C catalyzes the reaction in which:a
PIP2 is split. b. IP3 is converted to DAG. c. a protein kinase is activated. d. DAG is converted to PIP2. e. calcium ions are released from the ER.
When body temperature is too low, which of the following occurs?
A) Blood vessels in the skin constrict. B) Muscles relax. C) Sweat glands are activated. D) Blood vessels at the body surface dilate and fill with blood.