1. What types of biological macromolecules are most cell walls and extracellular matrices composed of? (Choose ALL correct answers)

[] proteins
[] nucleic acids
[] lipids
[] carbohydrates

2. What is a "second messenger"?

a. a protein that phosphorylates another substrate
b. a molecule that is produced or released intracellularly as a result of receptor activation
c. a signaling molecule that is released extracellularly
d. GTP

3. How can the activation of a protein kinase be important in signal transduction?

a. kinases bind to receptors to prevent the signal from binding the receptor
b. kinases prevent signal amplification by ensuring other proteins are not active
c. kinases can activate or deactivate existing proteins by phosphorylation
d. kinases are secreted by the cell as a signaling molecule

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Nelly Stracke
Nelly StrackeLv2
28 Sep 2019

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