Which of the following types of molecules are hydrophilic and therefore excluded from the hydrophobic portion of the phospholipid bilayer?

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#Question id: 29564

#Unit 6. System Physiology – Plant

Biotrophic fungi usually penetrate the rigid cell wall via the formation of a specialized infection structure on the plant surface called an 

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#Question id: 13164

#Unit 4. Cell Communication and Cell Signaling

Match the following.

Column I	Column II	Column III
A. G Protein–Coupled Receptors That Activate PDE	i. cAMP	a. Increase in conversion of glycogen to glucose
B. G Protein–Coupled Receptors That Activate Adenylyl Cyclase	ii. cGMP	b. Hyperpolarization or depolarization of photoreceptor membrane
C. G Protein–Coupled Receptors That inhibit Adenylyl Cyclase	iii. DAG	c. activates genes necessary for cell division
D. G Protein–Coupled Receptors That Trigger Elevations in Cytosolic and Mitochondrial Calcium		d. increase in K+ permeability hyperpolarizes the membrane

Which one of the following is correct?

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#Question id: 12465

#Unit 10. Ecological Principles

Which statement best describes what ultimately happens to the chemical energy that is not converted to new biomass in the process of energy transfer between trophic levels in an ecosystem?

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#Question id: 29002

#Unit 7. System Physiology – Animal

glycogenolysis stimulation takes place  when____

I- Glucagon receptors located on the hepatic cells by inhibiting glycogen synthesis 

II- Glucagon receptor found primarily on liver cells by increasing intracellular cAMP

III- Glucagon receptors located on the liver cells by inhibiting glycogen synthesis 

IV- Glucagon receptor found primarily on hepatic cells by increasing intracellular cAMP

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#Question id: 1711

#Unit 4. Cell Communication and Cell Signaling

On entering a germinal center, the primary B-blasts grow exponentially to form which cell type in the dark zone?