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Biology

1 answer:

bekas [8.4K]2 years ago

4 0

This is still the best question i’ve ever answered in my entire life.

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Use Darwin's theory of Natural Selection to explain the process by which the four-legged land animal, A, may have evolved, over

Len [333]

Answer:

Due to environmental conditions.

Explanation:

With the passage of time, environmental conditions change which causes the evolution of of four legged land animals from fish like creature. This change occurs due to change in environment. In water, there is no need for legs because fish moves with the help of fins and tail but the organisms that lives on land has legs in order to move from one place to another so we can say that change in the physical structure of organism occurs due to environment.

5 0

2 years ago

What advantage do organisms in a food web have over those in a food chain?

Karolina [17]

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3 0

3 years ago

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If the activation energy required for a chemical reaction were reduced, what would happen to the rate of the reaction?

Ivan

Answer:

The rate would increase.

6 0

2 years ago

Not one of the ways that bacteria have adapted to become resistant to antimicrobial agents.

Dominik [7]

Answer:

Explanation:

An antimicrobial agent is a natural or synthetic chemical that kills or inhibits the growth of microorganisms. Bacteria have a mechanism of transferring genomic material called horizontal gene transfer, the movement of genes between cells that are not direct descendants of one another. Horizontal gene transfer allows cells to quickly acquire new characteristics and drives metabolic diversity. One of the characteristics usually acquired is the resistance to antibiotics.

Three mechanisms of genetic exchange are known in prokaryotes:

(1) transformation, in which free DNA released from one cell is taken up by another; (2) transduction, in which DNA transfer is mediated by a virus; and (3) conjugation, in which DNA transfer requires cell-to-cell contact and a conjugative plasmid in the donor cell.

Examples of genes transferred by transducing bacteriophages include multiple antibiotic resistance genes among strains of Salmonella enterica serovar Typhimurium, Shiga-like toxin genes in Escherichia coli, virulence factors in Vibrio cholerae, and genes encoding photosynthetic proteins in cyanobacteria.

Conjugative plasmids use a mechanism to transfer copies of themselves and the genes they encode, such as those for antibiotic resistance, to new host cells.

8 0

3 years ago

If a plant cell is placed in solution and the cell shrivels up what type of solution was it placed in

IgorLugansk [536]

The plant cell was placed in a hypertonic solution. Due to its higher concentration of solutes and a net movement of water outside a hypertonic solution causes the cell to shrink. In other words, when a plant cell is placed in hypertonic solution the water from the cell will be forced out of the cell in an attempt to balance itself. This is known as plasmolysis.

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3 years ago