PROBLEM SOLVING SESSION #5: Cell Signaling 1. Signaling between cells usually re

Question

PROBLEM SOLVING SESSION #5: Cell Signaling 1. Signaling between cells usually results in the activation of protein A. pases kinases proteases D. nucleases 2. A cell secretes growth factors that have a slow diffusion rate, and interacting only with other cells in the immediate area is an example of signaling. A, exocrine synaptic paracrine D. cell contact 3. Estrogen, testosterone and cortisol are steroid hormones, and are most likely to bind to: A. membrane ion channel enzyme linked membrane receptor C. G-protein linked membrane receptor D. cytoplasmic receptors 4. Direct cellular connections such as gap junctions in animal cells and plasmodesmata in plant cells permit: A- adjacent cells to adhere strongly to each other. B. second messengers produced in one cell to rapidly diffuse into and stimulate events in surrounding cells. C. adjacent cells to form a water-tight barrier between their membranes. D. protein kinases to flow between cells, coordinating cellular responses in a tissue. E. the rapid exchange of genetic information between adjacent cells. 5. When a signal needs to be sent to most cells throughout a multicellular organism, the signal most suited for this is a (a) neurotransmitter (b) hormone. (c) dissolved gas. (d) scaffold. 6. During nervous system development in Drosophila, the membrane-bound protein Delta acts as an inhibitory signal to prevent neighboring cells from developing into neuronal cells. Delta is involved in signaling. (a) endocrine (b) paracrine (c) neuronal (d) contact dependent

Explanation / Answer

Reason:

Yes, many receptors bind ligand and activate protein kinases. The transfer of phosphate is a signal that leads to cell responses that may include cell division and differentiation.

Below lipases, proteases and Nucleases are not wright answers reason below

Lipase : an enzyme (as one secreted by the pancreas)

Protease: an enzyme which breaks down proteins and peptides

Nucleases: an enzyme that cleaves the chains of nucleotides in nucleic acids into smaller units.

2. Answers is C . Paracrine

Reason:

C.

paracrine

Yes, paracrine signals are produced by cells and bind to receptors on other cells in the immediate area.

Exocrine, synaptic and cell contact are not wright answers reason below:

Exocrine: glands are glands that produce and secrete substances onto an epithelial surface by way of a duct.

Synaptic: relating to a synapse or synapses between nerve cells.

Cell contact: Cell–cell interaction refers to the direct interactions between cell surfaces.

3. Answers. B

Enzyme liked membrane receptor.

4. Answer. C

Adjacent cells to flow form a water-tight barrier between their membrane.

5. Answer . A

6. Answer .A

C.

paracrine

Yes, paracrine signals are produced by cells and bind to receptors on other cells in the immediate area.

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