Answer:
Due to small in size.
Explanation:
Some organelles such as nucleus, mitochondria and Golgi bodies can't be seen because they are too small in size and near to the limit of the microscope. Organelles present in plant cell are nucleus, mitochondria and Golgi, endoplasmic reticulum, ribosomes, one big vacuole, cell membrane and cell wall whereas organelles present in animal cell such as nucleus, mitochondria and Golgi bodies, endoplasmic reticulum, ribosomes, lysosomes, several small vacuoles and cell membrane. In animal cell centriole and lysosomes are present and absent in plant cell while in plant cell, cell wall and one large vacuole present in the center of the nucleus and these organelles are absent in animal cell. Plant and animal cells are eukaryotic because they have organelles and surrounded by membrane.
Hand cut did go award to a good friend
Answer:
C
Explanation:
Iodine is used to test for starches. When iodine is placed in a solution with starch (non-reducing sugars) it turns blue-black color. When amylase, a starch, is mixed with saliva, it is ‘digested’ to glucose, a reducing sugar (the brown colour of the aqueous solution remains).
Answer:
The form of cell to cell signalling that is been used is ENDOCRINE.
Explanation:
There are four ways by which cell signalling occur in the body, these are: endocrine, paracrine, autocrine and direct signalling.
Endocrine signalling is the biochemical process by which hormone secreting glands release hormones into the blood streams and that hormone has effects on target organs that are located far away from it. Endocrine hormones are usually stable and their effects usually last for long time.
Despite their frequency in the intertidal zone, in tide pools, sea urchins can be found at many different depths and in any habitats. They can also be found in nearly any ocean temperature. Sea urchins inhabit the polar seas as well as the warm tropics.
