Answer:
Option (4).
Explanation:
Lac operon is present in E.coli that regulate the metabolism of lactose in the bacteria. Lac Operon consists of three genes : Lac Y, lac Z and lac A, an operator and a promoter.
I+ P+ Oc Z− Y+ / I− P+ O+ Z+ Y− , in this case inducer is present, promoter is present, constitutive region and the gene lac Z and lac Y indicates the Z and Y. The permease enzyme will made in the presence and absence of lactose due to the presence of I+ P+ Oc in the cell but beta galactosidase is only made in presence of lactose as Y− gene is present in the diploid cell.
Thus, the correct answer is option 4.
Answer:
AA, Aa and aa genotypes will be produced.
Explanation:
If two birds with AA and aa genotypes are crossed, 4 offspring with Aa phenotype may be produced in F1 generation.
P generation: AA x aa
/ \ / \
F1 generation: Aa Aa Aa Aa
When these F1 generation birds will be allowed to breed, the genotype of the F2 offspring will be as under:
Aa x Aa
/ \ / \
F2 generation: AA Aa Aa aa
3 types of genotypes AA, Aa and aa will be produced in F2 generation. Their ratio will be AA : Aa : aa = 1 : 2 : 1.
nuclear charge is always positive, because there are only protons in the nucleus, and protons are always positive.
But this is in general, because you have not mentioned the ion name.
Responder: Un pronóstico de siete días puede predecir con precisión el clima alrededor del 80 por ciento del tiempo y un pronóstico de cinco días puede predecir con precisión el clima aproximadamente el 90 por ciento del tiempo. Dado que no podemos recopilar datos del futuro, los modelos tienen que usar estimaciones y suposiciones para predecir el clima futuro.
<u>Answer:</u>
The main function of the ozone layer is to block most of the sun's damaging rays from reaching Earth.
Option: (b)
<u>Explanation:</u>
- The stratosphere containing high level of ozone molecules about 30 km to 50 km altitude helps to absorb the sun's ultra violate rays.
- In its absence, it would be very difficult for anything to survive. Plants cannot live and grow as the UV light causes weakening of plants.
- It causes skin cancers. The increase in UV flux will lead to increase in sunburn, blindness, cataract, causing potentially death of animals and plants.
