How do some bacteria survive in unfavorable conditions?

Compare at least two characteristics of mitochondria to prokaryotic cells and explain how this relates to the endosymbiotic theo

Gekata [30.6K]

The endosymbiotic theory stated that the mitochondria of eukaryotic cells are actually prokaryotic bacteria which were once engulfed by prehistoric eukaryotic cells as a result of evolution.

Therefore to answer this question, here are some characteristics:
1 Both mitochondria and prokaryotic cells contain their own DNA.

2 Neither of the two have true nuclei, but they do have a space in which their DNA is enclosed.
3 Mitochondria and prokaryotic cells have similar transcriptional machinery, which means that they have the same process of making RNA from DNA.

<span>4 Mitochondria contain their own genome, and the formation of their genome in most organisms is circular similar to prokaryotes.</span>

3 0

3 years ago

In a lab about the activity series, a solution of copper(II)chloride is placed in a test tube with zinc metal. If zinc is higher

Tcecarenko [31]

Answer:

Option D, Zinc is higher on the activity series because there is clear evidence of a reaction.

Explanation:

It is very clear that a metal which is higher in activity will replace a metal having lower activity.

Since, Zinc has higher activity than copper, it is very sure that it in a copper chloride solution it will replace copper and produce zinc chloride solution leaving behind copper as residue.

Residues of copper is a clear evidence of reaction

The chemical equation for this reaction would be -

$CuCl_2 + 2Zn^+ -----> 2ZnCl + Cu^{2+}$

Hence, option D is correct

5 0

3 years ago

Which of the following best explains why most chemical reactions proceed more quickly when the concentrations of reactants are i

dem82 [27]

At higher concentrations, it catalyzes the collisions. think of it like a glow-stick. the smaller ones aren't a bright because less chemicals are inside the tube, but large glow-sticks are brighter, and has more chemicals contained in the tube. the correct answer is 3, the catalyst answer. <span>At higher concentrations, product molecules are able to catalyze the reaction.
hope this helped. good luck!
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7 0

3 years ago

The central nervous system consists of the brain and the ________.

Anton [14]

Answer:The answer is spinal cord

Explanation:

The central nervous system consists of the brain and the spinal cord.

The brain is the most highly specialized organ, and is protected by the skull or cranium, while the spinal cord is made up of soft tissue which runs from the medulla oblongata to the tail region. It is protected by the bones of the vertebral column.

The spinal cord acts as a PATHWAY between spinal nerves and the brain.

7 0

3 years ago

You are a molecule of phosphorus. Choose a starting point in the process you would go through to move through the entire cycle.

noname [10]

Answer:

First I'd be found in rocks. Erosion would wash me into the soil. Then I'd be absorbed by plants, fungi or microorganisms so they can grow. Animals would get me by eating the plants or drinking the water that eroded the rock. The plants and animals die and I'm absorbed back into the soil.

Explanation:

Phosphorus Cycle Steps

The phosphorus cycle is a slow process, which involves five key steps.

Weathering

Since the main source of phosphorus is found in rocks, the first step of the phosphorus cycle involves the extraction of phosphorus from the rocks by weathering. Weather events, such as rain and other sources of erosion, result in phosphorus being washed into the soil.

Absorption by Plants and Animals

Once in the soil, plants, fungi, and microorganisms are able to absorb phosphorus and grow. In addition, phosphorus can also be washed into the local water systems. Plants can also directly absorb phosphorus from the water and grow. In addition to plants, animals also obtain phosphorus from drinking water and eating plants.

Return to the Environment via Decomposition

When plants and animals die, decomposition results in the return of phosphorus back to the environment via the water or soil.

Plants and animals in these environments can then use this phosphorus, and step 2 of the cycle is repeated.

Human Impact on the Phosphorus Cycle

Humans have had a significant impact on the phosphorus cycle due to a variety of human activities, such as the use of fertilizer, the distribution of food products, and artificial eutrophication. Fertilizers containing phosphorus add to the phosphorus levels in the soil and are particularly detrimental when such products are washed into local aquatic ecosystems. When phosphorus is added to waters at a rate typically achieved by natural processes, it is referred to as natural eutrophication. A natural supply of phosphorus over time provides nutrients to the water and serves to increase the productivity of that particular ecosystem. However, when foods are shipped from farms to cities, the substantial levels of Phosphorus that is drained into the water systems is called artificial or anthropogenic eutrophication. When levels of phosphorus are too high, the overabundance of plant nutrients serves to drive the excessive growth of algae. However, these algae die or form algae blooms, which are toxic to the plants and animals in the ecosystem. Thus, human activities serve to harm aquatic ecosystems, whenever excess amounts of phosphorus are leached into the water.

8 0

3 years ago