A house plant seems to be growing slowly and lacks its normal bright green color. 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 required before NADPH can function.
D) Mg2+ is an important component in chlorophyll.
E) Cytochromes require Mg2+ to function properly.
D) Mg2+ is an important component in chlorophyll.
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Which of the following represents the expected genotypes of an F1 generation consisting of 8 individuals from a cross of a true-breeding black BB. rabbit and a true-breeding white bb. rabbit?
A. 8 BB, 0 bb, 0 Bb B. 4 BB, 4 bb, 0 Bb C. 2 BB, 2 bb, 4 Bb D. 0 BB, 0 bb, 8 Bb
Which of the following is NOT a feature of the limbic system?
A. contains hippocampus and amygdala B. resides deep within the cerebrum C. responsible for emotional responses D. important in the formation and recall of memories E. part of the hypothalamus
When blood glucose is low, alpha cells secrete __________, which calls for glycogen breakdown and
glucose release by the liver. Fill in the blank(s) with the appropriate word(s).
Most ecologists believe that the average global carrying capacity for the human population is between
A) 5 and 6 billion. B) 6 and 8 billion. C) 10 and 15 billion. D) 15 and 20 billion. E) 20 and 25 billion.