Answer:
CRISPR-Cas9 is a DNA modification technique derived from a bacterial defense mechanism.
This breakthrough innovation allows the deletion and insertion of genes in a simple, fast and efficient way, much like "DNA scissors".
The CRISPR-Cas9 method is increasingly used in laboratories because it has several advantages over the DNA cutting enzymes developed before it.
First advantage, it is much easier to use (compared to other gene-editing tools). It has already allowed several teams of researchers to target several genes at once, including in human cells.
Other major advantages resulting from the simplicity of the system: its speed and its low cost. The CRISPR-Cas9 method takes only a few days (instead of a few months) and is at least ten times less expensive than those used before.
CRISPR-Cas9 is therefore a tool of disconcerting ease to modify the genome of many types of cells (to produce a protein for example), in bacteria, plants, animals and perhaps one day in humans.
The eukaryote that has a similar mode of nutrition to that of the white blood cells is AMOEBA.
Amoeba feed on microscopic organisms. When amoeba encounter a food particle, it extends its pseudopodia around the food particle and ingest it. The food particle which is now in the food vacuole of amoeba is broken down and digested by mean of digesting enzymes secreted by the organism.
Cross: AA × aa
F1 Progeny: Aa , Aa, Aa, Aa
Now, F1 Cross: Aa × aa
Progeny = Aa, Aa, aa, aa
Phenotypic ratio would be: (Agouti to smooth-haired) = (1:1)
Hope this helps!
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
