A common consequence of nutrient deficiencies in plants is chlorosis, which is
a. wilting due to a lack of chlorine in leaves.
b. death of the growing tips.
c. premature loss of leaves.
d. bursting of cells from excess water uptake due to an inability to clear chlorine from them.
e. yellowing of plant tissues due to a lack of chlorophyll.
E
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Which of the following structures is unpaired?
A) seminal vesicle B) ovary C) bulbourethral gland D) prostate gland
The bulk of the energy required by the eukaryotic cell is generated by the mitochondria. The mitrochondrion consists of cristae that
A) form a smooth, continuous outer membrane surrounding the entire organelle. B) form a complex fluid called a matrix outside the organelle. C) are elaborate folds on the inner membrane which hold the enzymes and electron carriers of aerobic respiration. D) are circular strands of DNA involved in producing the enzymes needed for anaerobic respiration.
After several weeks of exercise, a human athlete's resting heart rate is typically lower than before because
A) the body needs less oxygen than before. B) the body temperature has increased. C) the stroke volume has increased. D) the cardiac output has decreased. E) the body produces less carbon dioxide than before.
The disease known as "Croup" is often a result of infection with which of the following?
A) hantavirus B) influenzavirus C) Bordetella pertussis D) Mycoplasma pneumoniae E) respiratory syncytial virus