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.
0.388 centigrams. I hope this helps you!
Answer:
a. How can two places at the same latitude have different climates?
b.What is the relationship between latitude and climate?
Explanation:
a. Places at the same latitude may have very different climates if one is on a coast and one is inland. On the coast, the climate is influenced by warm moist air from the ocean. A coastal climate is usually mild. ... Farther inland, the climate is influenced by cold or hot air from the land.
b. There is a relationship between latitude and temperature around the world, as temperatures are typically warmer approaching the Equator and cooler approaching the Poles. There are variations, though, as other factors such as elevation, ocean currents, and precipitation affect climate patterns.
Answer:
I would say that meat is more energy efficient than vegetables because meat have more calories than vegetables do. Calories equal energy. For example, vegetables have an average calorie of 10 - 90 calories. While meat has 100 - 1200 calories. So, if calorie equals energy, I would say that calories are the reason why meat has more energy in it.
Explanation:
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Answer:
Thymine
Explanation:
DNA nucleotide bases always attach in specific pairs.
Adenine is always with Thymine and Cytosine is always with Guanine. Here, since one nucleotide is Adenine, we know the other nucleotide is Thymine.
One way to remember this pairing is by this device:
Car in the Garage (cytosine goes with guanine)
and
Apple on the Tree (adenine goes with thymine)