The Dlx gene encodes a transcription factor
that signals clusters of embryonic cells to ____
and give rise to an appendage.
a. fold into the cardiac muscle
b. protrude from the body
c. form reproductive structures
d. induce apoptosis in cells lining the
appendages
e. develop into the immune system
B
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The upper chambers of the mammalian heart are the
A. ventricles. B. arteries. C. vascular cavities. D. atria. E. sinuses.
Which component of a DNA nucleotide could be removed without breaking the polynucleotide chain?
A) Phosphate B) Nitrogen base C) Deoxyribose D) Ribose
A researcher suspects that the food in an ecosystem has been contaminated with radioactive phosphates over a period of months. Which of the following substances could be examined for radioactive phosphate to test the hypothesis?
A) the DNA of the organisms in the area B) the amino acids within proteins produced by organisms living in the area C) the starch produced by plants in the area D) All of the above are true.
Chitin and cellulose are examples of:
A) structural polysaccharides. B) storage polysaccharides. C) disacchrides. D) monosaccharides.