As it leaves the lung in the pulmonary vein, blood is ________ saturated with oxygen.
A) 90%
B) 98%
C) 108% (supersaturated)
D) 100% (completely)
E) 75%
Answer: B) 98%
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Which hormones are lipids derived from cholesterol? Check all that apply.
_____ melatonin _____ estradiol _____ cortisol _____ aldosterone _____ testosterone
One of the following is not a part of its paired
term. Choose the exception.
a. atom; organism b. community; ecosystem c. population; cell d. molecule; biosphere e. species; community
To restart a heart, rescuers use
a. CPR. b. a defibrillator. c. CPR and a defibrillator. d. serotonin injections. e. all of these.
Your house plant is growing slowly and lacks its normal bright green color, so you call a botanist for advice. She suggests that the plant may be deficient in magnesium (Mg2+). Why are these symptoms associated with Mg2+ deficiency?
A) Mg2+ is important in the structure of many amino acids. B) Lack of Mg2+ in the soil allows pathogenic bacteria to grow. C) Mg2+ is a cofactor for NADPH function. D) Mg2+ is an important component in chlorophyll. E) Cytochromes require Mg2+ to function properly.