Answer:
PLZ MARK ME AS BRAINLIST....
Explanation:
ANSWER OF 1ST QUESTION -
1) it protects the nucleic acid from digestion by enzymes, 2) contains special sites on its surface that allow the virion to attach to a host cell, and 3) provides proteins that enable the virion to penetrate the host cell membrane and, in some cases, to inject the infectious nucleic .
ANSWER OF 2ND QUESTION -
Mutations can produce viruses with a reduced pathogenicity, altered host range, or altered target cell specificity but with intact antigenicity. Such viruses can sometimes be used as vaccine strains.
<h2>Functions of spleen</h2>
Explanation:
The major functions of spleen besides filtering the blood of foreign materials and phagocytosis of old defective erythrocytes are:
- Initiate immune responses against infections by liberation of antigen and activation of lymphocytes (T and B cells)
- Secretes bactericidal agents which act against invading bacteria
- Secretes interleukins which promote the growth of lymphocytes or antibodies that act against pathogens
- Reservoir: Pools blood by storing thrombocytes, immature erythrocytes.
- Hematopoiesis: Blood cells like erythrocytes, lymphocytes and monocytes develop and mature in spleen especially during the early fetal life.
Answer:
A substance that is more dense per volume has more mass per volume. ...
Explanation:
Thus, sound will travel at a slower rate in the more dense object if they have the same elastic properties.
