Calculate the percentage of histidine that has its imidazole side chain protonated at pH 7.3. The pKa values for histidine are pK1 = 1.8, pK2 (imidazole) = 6.0, and pK3 = 9.2.

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#Question id: 12374

#Unit 10. Ecological Principles

The process in which pioneer species colonize a bare substrate such as rock, sand, or glacial till is known as

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#Question id: 9278

#Unit 6. System Physiology – Plant

Bilin pigments are open-chain tetrapyrroles found in antenna structures known as phycobilisomes that occur in

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#Question id: 19313

#Unit 4. Cell Communication and Cell Signaling

Match the following effector molecules with their pathogen

     

Pathogen	Effector molecules	Function
A) Fusicoccum amygdali	i) HC‐toxin	a) inhibits salicylic acid (SA)‐mediated defense responses
B) Cochliobolus carbonum	ii) Coronatine	b) Constitutively activates the plasma membrane H+‐ATPase
C) Pseudomonas syringae	iii) Fusicoccin	c) Inhibits histone deacetylase activity
		d) Opening of stomata

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#Question id: 1030

#Unit 4. Cell Communication and Cell Signaling

The membranes of eukaryotes and mycoplasma

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#Question id: 10988

#Unit 7. System Physiology – Animal

What is the normal total delay of the cardiac impulse in the A-V node and the A-V bundle system?