Which of the following nutrient deficiencies does NOT result in leaf chlorosis?
a. magnesium
b. iron
c. zinc
d. boron
Ans: d. boron
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Which of these methods can be used to determine the number of viable microorganisms in a sample?
A. Light scattering in a spectrophotometer B. Counting a known volume of cells in a hemocytometer C. Measuring colony forming units per ml D. Measuring total cell mass
In a developing human embryo, the hands and feet resemble mittens, with cells and tissues present between the fingers and toes. When a baby is born, these cells are not present, resulting in distinct fingers and toes. In the development of fingers and toes these cells were lost by ____.
A. cell connections B. cell migration C. apoptosis D. cell division E. cell morphology
Which of the following systems is NOT directly involved with regulation and maintenance of the body's chemistry?
A. the digestive system B. the circulatory system C. the respiratory system D. the urinary system E. the reproductive system
The short nucleotide sequence that base-pairs with any complementary sequences in DNA during PCR is a(n) ____
a. primer b. exon c. intron d. restriction enzyme e. polysome