Disturbances, such as fire, can sometimes increase coexistence between species and can increase diversity
Indicate whether the statement is true or false
TRUE
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During a stressful interval, _____
A) thyroid-stimulating hormaon (TSH) stimulates the adrenal cortex and medulla to secrete acetylcholine B) the alpha cells of islets secrete insulin and simultaneously the beta cells of the islets secrete glucagon C) adrenocorticotropic hormone (ACTH) stimulates the adrenal cortex, and neurons of the sympathetic nervous system stimulate the adrenal medulla D) the posterior pituitary gland secretes more growth hormones E) the calcium levels in the blood are increased due to actions of two antagonistic hormones, epinephrine and norepinephrine
Before ARF transcription factors can trigger auxin-induced gene expression, what must happen?
A. Auxin binds to ubiquitin, a degradation tag. B. Auxin degrades Aux/IAA proteins which repress ARF transcription factors. C. Auxin binds to TIR1, an auxin receptor. D. Auxin must bind to the ARF transcription factor. E. Ubiquitin must destroy TIR1 to release Aux/IAA proteins.
Choose the correct description of the Na+/K+ pump.
It is an example of primary active transport. It generates a positive membrane potential. It actively transports 2 potassium ions out of the cell. It actively transports 3 sodium ions into the cell.
Entamoeba histolytica is acquired by
A. sexual contact. B. contaminated water. C. contaminated food. D. ingestion of cysts of the pathogen. E. All of the choices are correct.