If a cell is fused with another cell, which of the following would be the best example of a trans-mechanism of epigenetic control?
A. A gene that is originally silenced in one cell but expressed in the other is silenced in the hybrid
B. A gene that is originally silenced in one cell but expressed in the other is still expressed in the hybrid.
C. The methylation pattern of the same gene from either cell is not altered
D. There are no examples that could conform to a trans-mechanism
A
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The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. allows a mixed group of comparisons among different organisms for the experimental group.
Glycolysis takes place in the ________, and the Krebs cycle and electron transport chain take place in the ________.
A. intermembrane space of the mitochondria; mitochondrial matrix B. mitochondria; cytoplasm C. cytoplasm; endoplasmic reticulum D. cytoplasm; mitochondria E. mitochondrial matrix; inner mitochondrial membrane
The Acadian flycatcher, Willow flycatcher, and Least flycatcher are morphologically very similar, but live in different habitats and do not reproduce with one another. Which species concept would be the most useful in determining if these flycatchers are different species? Explain.
What will be an ideal response?
How many codons are there for leucine?
A. two B. three C. five D. six E. four