The answer is D , all of the above
Answer:
that animals and humans are really closely related, as well as that helping treat animals with diseases can help treat humans with the same disease, The questions that raise in her mind is that physicians and veterinarians are similar but physicians only work with humans and veterinarians work with all kinds of different animals.
Explanation:
Answer:
The correct answer will be-
1. Nucleosomes
2. Chromatin
3. Sister chroamtid
4. Centromere
Explanation:
The DNA is a very long molecule which if has to be passed on to the daughter cell as it is will cause problems. So, to reduce problems a cell form tightly packed structure of DNA so that they can be passed easily to the daughter cell.
The packaging of DNA begins with the wrapping of the DNA around histone proteins which forms the 11 nm basic structural units called nucleosomes. The nucleosomes start condensing each other and form 30 nm structure chromatin fibres.
The chromatin fibres undergo replication during S phase which produces an exact copy of the chromatin called sister chromatids bound to each other at a central point called centromere which helps the separation of the chromatids during M phase.
Viruses are able to infect cells because they share a common <u>genetic</u> code and they use host cell machinery to carry out protein synthesis. Virus infecting a bacteria is called bacteriophage. These bacteriphages can use two different pathways to infect the virus: a) lytiic b) lysogenic. In lytic cycle the virus makes several copies of itself within bacteria and at the end bacterial cell is lysed. In lysogenic cycle virus integrates its DNA into bacterial genome.
Chromosomes first become visible during prophase.