Epithelium is the thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures.
Jawless fish. The class Agnatha is a class made up of jawless fish. It excludes all vertebrates with jaws.
Answer:
Bacteriophages are attaching to bacterial cell wall and injecting genetic material.
Explanation:
Bacteriophage:
A bacteriophage (bacteria eater) is a type of virus that infects bacteria. Bacteriophages are composed of genetic material (DNA or RNA) enclosed in a protein shell or capsid.
Following are steps of bacteriophage infection:
- Bacteriophage attaches to cell surface receptors on the surface of the bacterium.
- Depending upon the type of phage, the bacteriophage either injects its DNA or RNA into the bacterium or enters as a whole. In this image, the bacteriophage T4 is represented which injects its genetic material into the host cell.
- The phage's genetic material hijacks the cellular machinery of the host and replicates itself within the host.
- After replication, the phages burst open the bacteria cell and are released. This is called the lytic cycle of bacteriophage infection.
- In another type of infection cycle, called the lysogenic cycle, the bacteriophage genome gets incorporated into the host genome, known as a prophage. This prophage lies dormant.
* The second step of the infection cycle is pictured here.
Answer: idk
Explanation: need more points sorry
Ice cubes float because as it cools further and freezes into ice, it actually becomes less dense. On the other hand, most substances are most dense in their solid aka frozen state than in their liquid state. Water is different because of hydrogen bonding. ... ice floats because it is about 9% less dense than liquid water.
