In a receptor tyrosine kinase, formation of the dimer is initiated by
1.two receptor molecules each binding a signal molecule.
2.binding of phosphates to tyrosines on the cytoplasmic segment of the receptors.
3.activation of the protein kinase sites on the receptor.
4.receptor autophosphorylation.
5.activation of cellular proteins.
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Why is the absence of atmospheric oxygen (O2) so important to the Oparin-Haldane hypothesis?
a. Oxygen is corrosive and thus would have degraded many of the metallic compounds on the surface, releasing toxic gasses into the new atmosphere. b. Oxygen is more reduced than hydrogen gas, methane, or ammonia. c. Oxygen would have supported microorganisms that help chemical decay proceed. d. Oxygen is able to reverse reactions by removing electrons and hydrogen from organic molecules, thus destroying the first organic compounds as quickly as they developed. e. Oxygen would have caused multiple explosions, converting chemical energy into heat energy and rendering that energy unavailable for driving the synthesis of organic molecules.
If a person has a stroke and their speech becomes impaired, which region of the brain will likely to be affected?
A. parietal lobe B. frontal lobe C. occipital lobe D. temporal lobe E. brainstem
The vertebrae of today’s cod fish is a _____ with the prehistoric bony fish who also possessed vertebrae
a. homoplastic character b. monophyletic character c. shared derived character d. shared ancestral character e. shared homologous character
Which of the following is considered a secondary or additional function of the urinary system?
A. excretion of metabolic wastes B. maintenance of acid-base balance C. secretion of hormones D. synthesis of vitamin D E. maintenance of water-salt balance