Biology- Important Points-One Liners
1- Cell- It is the basic structural unit of life.
2-Cells were first discovered by Robert Hooke.
3-The smallest cell is 0.1 to 0.5 micrometer that is found in bacteria.
4-The single largest cell in the world is of an ostrich. The largest cell measuring 170 mm ×130 mm, is found in the egg of an
5- Smallest human cell is that of red blood cell.
6-The smallest cells are those of the mycoplasma.
7-The red blood cell carries respiratory gases.
8-Nerve cells in animals are the longest cells.
9-Largest human cell is that of female ovum
10-In plants Sieve cells transport nutrients.
11- The embryonic tissues like gills and tail are digested by the lysosome during the transformation of a tadpole into a frog.
12-The lysosomal enzymes present in the sperm cells digest the limiting membranes of the ovum (egg). Thus the sperm is able to enter the ovum.
13-Mitochondria is capable of replication as they contain DNA.
14-Blood Group AB is called Universal Receptor because it does not contain any antibody.
15-Blood Group O is called the Universal Donor because it does not contain any antigen.
16-Blood Platelets are also called Thrombocytes, which is found only in the blood of human and other mammals.
17-White Blood Corpuscles (WBC) are also called Leucocytes
18- Right Blood Corpuscles(RBC) is formed in Bone Marrow. At the embryonic stage, its formation takes place in the liver.
19- RBC contains hemoglobin, in which haeme iron-containing compound is found and due to this the color of blood is red.
20-The iron compound found in hemoglobin is haematin.
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