Kinases and phosphatases are essential in the cell because they
A) help turn proteins "on and off" through changes in phosphorylation status.
B) are enzymes that destroy damaged proteins.
C) sense short poly-A tails in mRNA as a signal to degrade the mRNA.
D) destroy second messengers, thereby turning off a signal transduction pathway.
E) all of the above
A) help turn proteins "on and off" through changes in phosphorylation status.
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Answer the following statements true (T) or false (F)
1. The bicoid gene is a homeotic gene that encodes a transcription factor. 2. Both embryonic stem cells and embryonic germ cells are pluripotent. 3. A myeloid progenitor cell can differentiate into immune cells of the blood and lymph systems. 4. Davis, Weintraub, and Lasser demonstrated that MyoA, MyoD, and MyoH could transform undifferentiated fibroblast cells into muscle cells. 5. There are no federal government funds currently available for stem cell research.
_____ is(are) formed during the oxidation of pyruvate to acetyl CoA
1.Glucose 2.CO2 3.NADH+ 4.ATP 5.Both NADH+ and CO2
The activation of the parasympathetic branch of the autonomic nervous system is associated with _____
A) resting and digesting B) release of epinephrine into the blood C) increased metabolic rate D) intensive aerobic exercise
Where does DNA replication occur?
A. Ribosomes B. Rough ER C. Nucleus D. Golgi