c.midrib. The petiole is a stalk arising from the stem of the plant that connects the stem to the leaf blade. In the middle of the leaf blade is the midrib, which is an extension of the petiole.
A sperm cell's structure is very specialized. Its flagellum is used for locomotive function, to rapidly swim directly through the egg cell. While the cytoplasm, it contains organelles, such as the Mitochondria, wherein respiration occurs, to release the energy needed for the sperm's journey towards the egg cell. Sperm cells, contain special enzymes known as acrosomes, this special enzymes allows the sperm to break through the cell membrane of the egg.
Answer:The correct answer is " a"
LDL contain protein,triglycerides,phospholipid and cholesterol.
Explanation:
Low density lipoprotein,or LDL,are complex aggregates of lipids and protein.Their function is to transport lipids (fats) around the body,in the bloodstream,and to the cells where its required.Apart from this,it also carries triglycerides,phospholipids and fat soluble vitamins.
Lipoprotein is composed of a hydrophobic core that is made up of polyunsaturated fatty acids and cholesterol molecules,along with a lipid membrane that contains protein called apolipoproteins.
There are 4 major classes of lipoprotein:
•chylomicrons
•very low density lipoprotein(VLDL)
•high density lipoprotein (HDL)
•low density lipoprotein(LDL)
The human digestion starts in the small intestine gets the
most of the nutrients in your food, and your circulatory system passes them on
to other parts of your body to store or use.
When food enters the small intestine, villi along the intestine wall
along with enzymes help break down the food, and takes a long journey. The
stomach is right above the small intestine, and the small intestine is all
wrapped around, and isn't that thick. Nutrients from the food are released to
the whole body as energy. The small intestine brings the food to the large
intestine, which is five feet long and is near your pelvis, or hips. The large
intestine connects to the rectum, and then to the anus. In the large intestine,
all the water is absorbed as well as salt.
