The following provides the best argument for separating Archaea and Bacteria into their own domains instead of leaving them together in the single kingdom, Monera :

It was discovered that they make their membranes differently and copy their DNA differently.

Explanation:

The reason that Archaea were determined to be a separate kingdom so late was because archaea often completely resemble eubacteria. But you can see that fungi and other eukaryotes are more similar to archaea than the bacteria.

Archaea have cell walls that lack peptidoglycan and have membranes that enclose lipids with hydrocarbons rather than fatty acids

Bacteria: cell membrane contains ester bonds; cell wall made of peptidoglycan; have only one RNA polymerase; react to antibiotics in a different way than archea do

Archaea and bacteria are both prokaryotes, meaning they do not have a nucleus and lack membrane-bound organelles.

Both archaea and bacteria have flagella, thread-like structures that allow organisms to move by propelling them through their environment.

In all organisms, cell membranes are made of molecules known as phospholipids.

The phospholipids of archaea are unusual as they have membranes composed of glycerol-ether lipids, whereas bacteria and eukaryotes have membranes composed mainly of glycerol-ester lipids

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3 years ago

Mendel's law of independent assortment was best demonstrated when he crossed true-breeding plants and followed two traits at a t

Ket [755]

Answer:

d. He observed that both dominant traits always hid the recessive traits in these double crosses.

Explanation:

The observation that the dominant traits hid the physical expression of recessive traits in dihybrid cross helped Mendel to formulate the law of independent assortment of genes.

The law of independent assortment of genes states that traits are inherited independently of one another without any form of interference.

For example, the trait for height (T, tallness is dominant over t, shortness) and seed shape (smooth, S is dominant over wrinkle, s) will be independently inherited in a cross involving the two traits.

The ratio of tall individuals to short individuals and that of smooth individuals to wrinkle individuals at F2 will both be 3:1, which is the same standard ratio that will be obtained if the traits are considered independently.

The correct option is d.

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3 years ago