Answer:
The two types of molecules synthesized by smooth endoplasmic reticulum is phospholipid molecules of plasma membrane and steroid hormone.
Explanation:
Endoplasmic reticulum is one of the most important organelle found inside the cytoplasm of eukaryotic cell.Endoplasmic reticulam is of two types
1 Rough endoplasmic reticulum contain ribosome on its surface which is responsible for the roughness of this endoplasmic retuculum.Rough endoplasmic retuculm help in protein synthesis.
2 Smooth endoplasmic reticulum does not contain ribosomes in its structure.Smooth endoplasmic reticulum is found in large amount in the testis ans ovaries of human.
Smooth endoplasmic reticulum play a significant role in the biosynthesis of phos pholipid of plasma membrane along with the production of various steroid hormones such as testosterone.
Answer:
a. are probably built by different genes.
Explanation:
Although sharks and dolphins are aquatic animals belonging to the vertebrate group, sharks are fish while dolphins are mammals. Sharks belong to the class Chondrichthyes which are fish that have a cartilaginous skeleton. On the other hand, dolphins are mammals (class Mammalia) which are animals mainly characterized by the presence of mammary glands. In consequence, both species are not closely phylogenetically linked, thereby those genes involved in the development of the integumentary system (skin) in both species are expected to be different.
Pollen , coal and stems are evidences that plants existed in Antarctica.
Explanation:
- Pollens being highly resistant to temperature changes due to the presence of sporopollenin must have remained preserved in ice covered continent of Antarctica.
- Pollens are reproductive units of Plant that suggest existence of plants in the Ice covered land.
- Coal is formed as the fossilization of plants under anaeorobic conditions and high pressure. thus, this also suggest the existence of plants.
- Stems are plant parts thus clearly is an evidence that plants existed there.
The most likely thing that happened with this poor young woman who broke her leg was that she broke hte bone at a very young age and that it fully healed. C
This is so because collagen is a substance that gets secreted at the point of fracture which helps strengthen the bone. Having a higher amount of collagen at the site of a broken bone means that the bone probably healed properly and there was a remainder of collagen to be found.
