Question 3 Which of the following processes will demonstrate a linear uptake cur

Question

Question 3 Which of the following processes will demonstrate a linear uptake curve as the extracellular concentration of molecules increases?

active transport

receptor-mediated endocytosis

pinocytosis

carrier mediated facilitated diffusion

Question 4 When G proteins activate adenylyl cyclase, the concentration of ___ increases in the cytosol.  

cAMP

Ca++ ATP

DAG and IP3

Question 5 Addition of mannose to lysosomal enzymes happens where in the synthesis process?

cytosol

smooth ER

trans-Golgi network

Rough ER

Question 6 Which of the following statements is TRUE?

All extracellular signaling molecules are transported across the plasma membrane into the cytosol by their receptor.

A cell-surface receptor capable of binding only one natural ligand can mediate only one kind of response.

All hydrophobic signaling molecules bind cell-surface receptors to induce a response.

All hydrophilic signaling molecules bind to cell-surface receptors that contain at least one membrane-spanning domain.

Question 7 When G proteins activate phospholipase C, the concentration of ___ increases in the cytosol.

Ca++

CAMP

ATP

DAG and P3

Question 8 Phosphorylation of mannose residues in the cis-Golgi network is part of the formation process for these organelles.

Rough ER

Lysosomes

Mitochondna

Question 9 Differentiation of neuronal cells from epithelial cells during development is an example of which of the following?

Hormonal signaling

Neuronal signaling

Contact-dependent signaling

Paracrine signaling

Question 10 When a trimeric G protein is activated by a cell-surface receptor___

the BY subunit exchanges its bound GDP for GTP.

It dissociates into an active a subunit and an inactive BY subunit.

It dissociates into a free B subunit and an ay subunit.

The a subunit exchanges its bound GDP for GTP

Explanation / Answer

4] cAMP

5] trans-Golgi network

6] All hydrophilic signaling molecules bind to cell-surface receptors that contain at least one membrane-spanning domain.

7] Ca++

8] Lysosomes

9] Paracrine signaling (by Wnt pathway)

10] The a subunit exchanges its bound GDP for GTP

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