People with cystic fibrosis often suffer from a lack of oxygen. Oxygen is required by what cell
organelle?
a. mitochondrion
b. nucleus
c. ribosome
d. cytoskeleton
A
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The lymph nodes lie at the junctions of lymphatic vessels where they filter out microbes and antigens from the lymph.
Answer the following statement true (T) or false (F)
In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because ____.
A. the signal is amplified by activation of transcription factors that each catalyze multiple reactions B. each hormone can bind to multiple receptors simultaneously causing amplification of the signal C. the signal is amplified by activation of enzymes that each catalyze multiple reactions D. each hormone can bind to transcription factors simultaneously causing amplification of the signal E. the hormone triggers the cell to release more hormones, amplifying the signal
Coordinate genes in an organism such as Drosophila determine the ________ of the early embryo
Fill in the blank(s) with correct word
Earth has supported life for approximately
A. 20 billion years. B. 3.8 - 3.7 billion years. C. 1.5 billion years. D. 700 - 800 million years.