Why are regions in the centromeres and telomeres rarely expressed?
a. They are wound around histone proteins.
b. They are rapidly evolving.
c. They are packed in heterochromatin.
d. A and B.
e. All of the above.
C
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The function of the Rev protein encoded by the HIV genome is to:
A. reverse transcribe its RNA genome to DNA. B. ensure that HIV gene transcripts containing introns are transported to the cytoplasm. C. integrate the HIV genome into the host genome. D. None of the above is correct.
What is the primary cause of allopatric speciation?
a. Geographic separations b. Chromosomal abnormalities c. Limited natural resources d. Microevolution factors
Which of the following is not found in DNA?
A) uracil B) cytosinne C) adenine D) thymine
The earliest known land plants date to the
A) Pleistocene (late Cenozoic era). B) Ordovician (early Paleozoic era). C) Carboniferous (late Paleozoic era). D) Jurassic (middle Mesozoic era).