Answer:
The correct option is option A
Explanation:
Restriction enzymes are endocleases that cleave DNA fragment (<u>of usually four, five or six nucleotide long</u>) at <u>specific sites to produce blunt or sticky ends</u>. They <u>recognize palindromic sequences of host DNA when cleaving the specific sites</u>. The sequences below (on complementary strands) give an example of a palindromic sequences.
5'-CCC║GGG-3'
3'-GGG║CCC-5'
As can be seen above, when read from 5' to 3', the two sequences are the same despite being on opposing strands. And when cut between the guanine (G) and cytosine (C) (as shown above), it produces a blunt end. But when cut as shown below produces a sticky end.
5'- G║AATTC -3'
3'- CTTAA║G -5'
The explanation above shows options C and D are right while option A is wrong (hence the correct option).
Also, bacteria prevent their own DNA from been digested by restriction enzymes by adding methyl group to their restriction sites <u>which prevents restriction enzymes from recognizing restriction sites of their DNA;</u> this generally makes bacterial DNA to be highly methylated. This explanation makes option B right also.
ALL PROTISTS ARE UNICELLULAR AND MICROSCOPIC IN NATURE, is the correct answer.
Protists are diverse collection of organisms which are primarily microscopic and unicellular in nature. Protists are scientifically categorized as eukaryotes and one definition of protists states that prosists are all eukaryotes organisms that are not animal, plant or fungi.
Prevent loss of Genetic Diversity and Inbreeding
The knowledge of parentage provides one with information about the origin and identity of the parents.
The variations and changes in the genes of the progeny of the parents can also be understood by the knowledge of the parentage.
Population of wild endangered species can benefit from the knowledge of parentage as this can help in prioritizing original gene material, avoid inbreeding incidents , important tool to manage cross between species hence aiding in the prevention of genetic diversity and loss of population.
In zoos, inbreeding is very common due to small populations which can lead to an increase in homozygous populations instead of heterozygous ones. Decrease in heterozygous populations implies decrease in genetic variability.
∴ Knowledge of parentage in zoos can help with that.
(to know more about Parentage : brainly.com/question/24506050)
Answer:
Nitrogen thet cannot be used by organisms. C.
Explanation:
Free nitrogen is simply molecular nitrogen (N2). Nitrogen, in its molecular form, consists of two nitrogen atoms bound together with a tripple bond. Because it is very stable, N2 is typically nonreactive, and takes a lot of energy to break them apart. Among these are the amino acids necessary for life to begin and which are the building blocks DNA is made from. Basically, any nitrogen that is in an organic compound is considered “fixed” nitrogen and N2 is considered to be “free” nitrogen
