Answer:
Carbohydrates, particularly glycoproteins act as ligands for cell surface receptors.
Explanation:
Glycoproteins
- Glyproteins are conjugate molecules comprising of carbohydrates conjugated with proteins.
- Glycoproteins play a vital role in cell-cell recognition, pathogen recognition and and cell adhesion.
- Glycoproteins on the surface of pathogens act as prominent antigens for the immune system.
Glycoproteins in Fertilization:
Several glycoproteins are attached to the surface of the zona pellucida, the envelope of the oocyte. In humans, these have been termed as ZP1-4.
Glycoprotein-sperm interaction is one of the most crucial steps in fertilization. This receptor-ligand interaction ensures the entry of the sperm into the zona pellucida, the extracellular coat, covered in glycoproteins that surrounds the oocyte or egg.
Carbohydrate binding proteins present on the surface of the sperm recognize the glycoproteins on the zona pellucida (ZP). This enables them to adhere to the surface of the ZP and also to gain access to the oocyte.
Answer:
The correct answer is B) "there is a close relationship between carbohydrate synthesis and carbohydrate metabolism".
Explanation:
The Calvin cycle are a series of chemical reactions that occurs in plant's stroma, and allow the convert carbon dioxide and other compounds into glucose in the absence of light. Most of the enzymes that function in Calvin cycle function as well in metabolic pathways, because there is a close relationship between carbohydrate synthesis and carbohydrate metabolism. Particularly, gluconeogenesis and the pentose phosphate pathway have equivalent enzymes that those found in the Calvin cycle.
Answer:
Answer is true.
Explanation:
Amnesia or dissociative amnesia occurs when the memory is functioning abnormally due to the effects of psychological trauma on the brain. This means that the resulting abnormal brain functioning is solely due to the psychological stress and not physiological effect.
The genotype in an organism is usually told by its characteristics.
so this would be things like the color of its feathers, the size and shape of the beak, etc.
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