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valentina_108 [34]
3 years ago
13

Which of the following is true about top predators? Select one: a. They include bacteria and fungi. b. Their removal increases b

iodiversity. c. They are likely to be herbivores. d. They are often keystone species. e. They are likely to be producers.
Biology
1 answer:
Len [333]3 years ago
4 0

Answer:

d. They are often keystone species

Explanation:

Top predators in an environment are the largest predators and sits on the top (apex) of the food chain in an ecosystem which do not have any natural predators.

As the top predators relative to its abundance has disproportionately large effect on its natural environment, they are the keystone species most of the time.

Hence option d. They are often keystone species is the right  option.

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Control of cell transition from one phase of the cell cycle to another

Explanation:

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The role of cyclin C and H in the processes of transcription regulation is shown.

Cyclin H, together with the transcription factor TFIIH, plays a role in the phosphorylation of the CTD-tail of RNA polymerase II during the transcription process.

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How do organisms affect the environment
Crank

<u>Answer:</u>

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a) The producers

b) The consumers

c) Decomposers

These three organisms are interlinked with each other. Without them there is no existence of the environment. The producers produce the food, the consumers consume them and the decomposers decompose and release it in the form of energy. In each cycle energy is released and absorbed. The balance in the environment is maintained by the food pyramid.

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Describe the idea of excited electrons:
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5 0
2 years ago
Map One method for separating polypeptides makes use of their different solubilities. The solubility of large polypeptides in wa
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Answer: For (a):

(Lys-Ala)3 is soluble and (Gly)zo is not soluble.

(b) (Glu)zo is soluble and (Phe-Met) is not soluble.

(c) ( Asn-Ser-His) is soluble and (Ala- Asp-Gly) is not soluble.

(d) (Asn-Ser-His) is soluble and (Ala-Ser-Gly).

Explanation:Firstly, the solubility of polypeptides relies on polar groups in the R group of the side chain and also ionized groups because these groups can interact with dipole bond of water.

For (a): (Gly)zo, no R group of the side chain of (Gly)zo is polar nor ionizable and solubility is based on the ability of R group of polypeptides to be polar or ionized while in polypeptides of (Lys-Ala), Lys is polar and therefore soluble though Ala in the compound is not polar nor ionizable but the presence of Lys makes the polypeptide to be soluble.

(b) (Glu)zo is a polar peptide, therefore soluble peptides while both the combination of (Phe-Met)3 gives polypeptides that are not polar therefore not soluble.

(c) In poypeptide of (Ala-Asp-Gly)s, the R group on the side chain of both Ala and Gly are neither polar nor ionizable therefore cannot be soluble even though Asp( which at PH 3 can partially be protonated and partially deprotonated to make it soluble) is present in the polypeptide. Therefore the polypeptide of Ala-Asp-Gly is not soluble compared to Asn- Ser-His, where Asn has polar covalent bond which can interact with water, His which at pH 6 will be half protonated and half deprotonated making the substance to react with water and also Ser is a soluble polypeptide too.

(d) Also between (Ala- Ser-Gly) and ( Asn- Ser-His), polypeptide with (Asn-Ser-His) will be considered soluble because Ala and Gly have R groups that neither polar nor ionizable though Ser is soluble but common to both substances, its influence will not be effective and (His) is a soluble which at pH 6 get partially protonated and deprotonated.

3 0
3 years ago
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