What happens to E. coli when lactose is not present? a. The enzymes needed to break down lactose are continually produced.
b. The genes that produce the enzymes needed to break down lactose are not expressed.
c. E. coli is not able to survive without lactose.
d. The genes required to produce the enzymes that break down lactose are destroyed.

Answer:

The answer is Diploid number of Chromosomes, Haploid number of Chromosomes and Gamete Cells.

Explanation:

Meiosis is one of the forms of cell reproduction, this process is performed in the gonads for the production of gametes (haploid sex cells). Meiosis is a process of cell division in which a diploid cell (cells that have a double number of chromosomes) experiences two successive divisions, with the ability to generate four haploid cells.

Answer: The correct answer is- This relationship is one of example of  mutualism.

Mutualism can be described as a biological interaction between two species that live in close association with each other in a way that both the partners are benefited from each other. It is a type of symbiotic relationship.

Lichen shows mutualistic relationship between algae and fungus, where photosynthetic algae provides food source to the fungi and fungi in return provides protection to algae as well as provides nutrients from the surrounding.

Thus, it is an example of mutualism.

Answer:

A stay inside

Explanation:

The comparison of the ways in which iron-magnesium minerals and feldspars crystallize from magma is;

Feldspars continually react with magma and change composition but stay as feldspar whereas iron - magnesium react with magma and change into other minerals.

• In Bowen's reaction series, feldspar minerals tend to continually change composition, whereas iron - magnesium minerals tend to have an abrupt change of their mineral types.

• Now, the feldspars that are formed from cooling of magnma are usually very rich in calcium. Thus, as cooling continues, the feldspars will start reacting with the magma and as such the feldspar composition will undergo some changes. This reaction will lead to zoned crystals that have outer layers very rich in sodium while the core is very rich in calcium.

• For the iron - magnesium minerals, when magma starts to cool, a mineral will now start to crystallize but the more the magma cools the more the temperature drops and a whole new mineral will be formed.

• Finally, the minerals formed initially reacts with the magma which makes it to be converted into the new mineral.

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