What is the sex chromosome composition of a person with Turner syndrome?
a. XXX
b. XO
c. XXY
d. XYY
e. YY
ANSWER: b
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Why would the presence of a specific type of keratin, an intermediate filament protein, in the bloodstream or lymph node be an indicator of metastasis of tumor cells?
A. Intermediate filaments are only found in tumor cells. B. Keratin is only present if its specific cell type is also present. C. Intermediate filament proteins cause cells to clump together. D. Answers b and c are both correct.
When assessing the role of conjugative bacteria in the spread of antibiotic resistance genes, it is fair to say that Hfr cells contribute most while F- cells contribute least.
Answer the following statement true (T) or false (F)
For which of the following nutrients does a deficiency not result in leaf chlorosis?
a. Nitrogen. b. Magnesium. c. Iron. d. Zinc. e. Boron.
The production of root hairs is mostly dependent on
A. position of the root in the soil. B. width of the root. C. length of the root. D. position of an epidermal cell. E. auxin production.