Answer:
1. A. Pseudomonas and E. coli
2. B. Red without black center
3. B. Salmon/orange
Explanation:
Pseudomonas is referred to as an oxidase positive bacteria while E. Coli is an oxidase negative bacteria. The use of the oxidase test will be helpful in the differentiation of the two Bacteria according to their oxidase activity/properties.
Colonies of Red without black center color is what is expected on HE agar if shigellosis is suspected.
Colonies of Salmon/Orange color is what is expected on HE agar if Enterococcus sp. is suspected.
Answer:
point mutation, change within a gene in which one base pair in the DNA sequence is altered. Point mutations are frequently the result of mistakes made during DNA replication, although modification of DNA, such as through exposure to X-rays or to ultraviolet radiation, also can induce point mutations
Answer:
Lithosphere made the earth outermost layer, crust and upper portion of mantle.
Asthenosphere made the middle layer of earth.
Explanation:
Lithosphere:
Lithosphere made the earth outermost layer, crust and upper portion of mantle.
It is made up of tectonic plates.
Lithosphere present over the asthenosphere.
Lithosphere have low temperature as compared to asthenosphere.
Its rocks are rigid.
It is less viscous and dense
Asthenosphere:
Asthenosphere made the middle layer of earth.
When material present in asthenosphere solidify it becomes the part of lithosphere.
Asthenosphere have high temperature as compared to the lithosphere.
Its rocks are plastic and have tendency to flow.
It is more viscous and dense.
Answer:
The correct answer is "exchange of genetic information between parental chromosomes".
Explanation:
Homologous recombination is a genetic recombination that occurs when two similar or identical molecules of DNA exchange some of its nucleotide sequences. This type of recombination is most widely used for DNA repair purposes, however this is not distinctive of eukaryotes as prokaryotes use it as well. Therefore the most significant an unique role of homologous recombination in eukaryotes is the exchange of genetic information between parental chromosomes. This particular function is known as chromosomal crossover and it is only found in eukaryotes.
