TH cells express a ________ protein coreceptor
A) CD4
B) CD8
C) CD12
D) T cell receptin
Answer: A
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The pathway for a simple reaction to a stimulus is
a. sense organ, sensory neuron, association neuron, motor neuron, effector. b. sense organ, sensory neuron, motor neuron, association neuron, effector. c. sense organ, motor neuron, sensory neuron, association neuron, effector. d. sense organ, motor neuron, association neuron, sensory neuron, effector.
About 55% of whole blood is ________, which is/are mostly made up of water
A) plasma B) hemoglobin C) white blood cells D) clotting proteins E) hematocrit
You are studying with a classmate who asks you about the concept of a replacement rate. She wants to know what happens to a population if the replacement rate is reached? She also assumes the average human replacement rate is 2.0. What would you tell her?
A. When replacement rate is reached, the population is in equilibrium. The replacement rate is equal to 2.0 to replace both mother and father. B. When replacement rate is reached, the population declines. The replacement rate is greater than 2.0 to make up for declining birth rates. C. When replacement rate is reached, the population is in equilibrium. The replacement rate is greater than 2.0 because some individuals die before they reproduce. D. When replacement rate is reached, the population declines. The replacement rate is lower than 2.0 to make up for increasing birth rates. E. When replacement rate is reached, the population increases. The replacement rate is lower than 2.0 to make up for increasing birth rates.
Enzymes can lower the activation energy of a chemical reaction by
A) stabilizing the transition state. B) properly positioning reactants. C) properly positioning reactants and stabilizing the transition state. D) raising the temperature so that reactants collide more forcefully. E) properly positioning reactants and raising the temperature so that reactants collide more forcefully.