1. <span>Any of a group of RNA viruses whose RNA is used as a template inside a host cell for the formation of DNA by </span>means<span> of the enzyme reverse transcriptase. The DNA thus formed is inserted into the host cell's genome. Most </span>retroviruses<span> can cause cancer. </span>Retroviruses<span> also include HIV.
2. </span>Prokaryotes<span> are 1-celled organisms that </span>do<span> not have a nucleus or any other membrane-bound organelles inside them. The name </span>prokaryote<span> itself actually lets you know that there isn't a nucleus, since pro </span>means <span>before and karyo refers to nucleus.
3. </span>Antibiotic resistance<span> occurs when </span>bacteria<span> change in some way that reduces or eliminates the effectiveness of drugs, chemicals, or other agents designed to cure or prevent infections. The </span>bacteria<span> survive and continue to multiply causing more harm. </span>Bacteria<span> can </span>do<span> this through several mechanisms.</span>
Answer:
The biosphere is made up of the parts of Earth where life exists.
They are composed of living organisms and the abiotic factors
Explanation:
So B is correct :)
Answer:
Replicated chromosomes at metaphase I = 66
Sister chromatids at metaphase I = 66 x 2 = 132
Sister chromatids at prophase II = 66
Chromosomes in each sperm cells = 33
Explanation:
Metaphase I of meiosis I would have 66 replicated chromosomes in the testicular cells of the bird. Each of the replicated chromosomes would have two sister chromatids. So, a total of 66 replicated chromosomes would have 66 x 2 = 132 sister chromatids.
Due to segregation of homologous chromosomes towards opposite poles in anaphase I, each daughter cell formed by the end of meiosis I would have 33 replicated chromosomes. So, each of the daughter cells would have a total 33 x 2 = 66 sister chromatids at prophase II.
Since meiosis II maintains the chromosome number, each sperm cell formed by the end of meiosis II would have 33 chromosomes.
The answer is A.They contain different genes
Answer:
Dmitri Ivanovsky
Explanation:
Dmitri Ivanovsky utilized one of these filters in 1892 to demonstrate that despite being filtered, sap from a diseased tobacco plant remained infectious to healthy tobacco plants. The filtered, infectious substance was dubbed a "virus" by Martinus Beijerinck, and this discovery is regarded as the origin of virology.
