A portion of a microarray is shown above in which the expression of genes on human chromosome 21 was examined in
normal brain cells (cDNAs labeled with a white fluor) or brain cells from an individual with a neurological disorder
(cDNAs labeled with a black fluor).
Which genes are over-expressed in the abnormal cells compared to the normal cells?
a. A2, B1, B3, and C4
b. B2 and C1
c. A1, A3, A4, B4, C2, and C3
d. A1, A2, B2, and C1
e. A2, C2, and C4
e. A2, C2, and C4
ANSWER: a
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Free radicals contain unpaired electrons in their outermost energy shell, so they react readily with other atoms or molecules to reach a more stable state. Which of the following could potentially be a free radical?
A) Magnesium (atomic number 12 ) B) Neon (atomic number 10 ) C) Helium (atomic number 2 ) D) Fluorine (atomic number 9 )
All of the following are components of an amino acid EXCEPT a(n)
A) carboxyl group. B) pentose group. C) amino group. D) ?-carbon. E) R group.
Explain the relationship between DNA and proteins
What will be an ideal response?
Which description goes with number 3?
A) Carrier is contaminated but not infected. B) Carrier has infection but it is not apparent. C) Carrier transmits infection before or after the period of symptoms.