Answer:
B. Proteins
Explanation:
Salivary amylase is an enzyme that starts the breakdown of starch in the mouth. Gastric glands of the stomach secrete gastric juice, which contains HCl to kill bacteria and denatures proteins, intrinsic factors, and the enzyme pepsin. The chief cells of gastric glands secrete pepsinogen (an inactive form of pepsin).
Pepsin begins the digestion of proteins in the stomach. It breaks down certain peptide bonds between amino acids and thereby, breaks down protein chain into smaller peptide fragments. Pepsin requires a very acidic environment of the stomach (pH 2) and becomes inactive at a higher pH.
B connective; bind and support the body
Answer:
False
Explanation:
G-Protein Coupled Receptors (GPCR):
GPCRs are transmembrane receptors with three components:
- Extracellular domain for ligand binding
- Seven transmembrane helices
- Intracellular G-protein binding domain
Transmission Through GPCRs:
- A ligand binds to the extracellular domain of the GPCR.
- The GPCR undergoes conformational changes.
- This conformational change activates the G-protein by replacing its bound GDP (guanosine diphosphate) with GTP (guanosine triphosphate).
- The G-protein then loses its GTP bound alpha subunit which activates the adenylyl cyclase system.
1. The phrase Darwin used to describe his broad theory of evolution is ''descent with modification.
2. All of life is related through common ancestry, accounting for the Unity.
