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Ilia_Sergeevich [38]
3 years ago
7

For several decades now, amphibian species worldwide have been in decline. A significantproportion of the decline seems to be du

e to the spread of the chytrid fungus,Batrachochytrium dendrobatidis (Bd). Chytrid sporangia reside within the epidermal cellsof infected animals, animals that consequently show areas of sloughed skin. They can also belethargic, which is expressed through failure to hide and failure to flee. The infection cycletypically takes four to five days, at the end of which zoospores are released from sporangiainto the environment. In some amphibian species, mortality rates approach 100%; otherspecies seem able to survive the infection.If Bd cannot grow properly at temperatures above 28°C (82°F), then, assuming theamphibians can survive, in which time or place should the chytrid infection proceed mostrapidly?1. cooler months2. warmer months3. lower altitudes4. higher altitudes
Biology
1 answer:
IceJOKER [234]3 years ago
6 0

Answer:

Infection with these microorganisms would be even more noticeable in cold stages where temperatures are less than 28 degrees, since in this way the microorganisms would not survive in the external environment and would less infect amphibians.

Explanation:

Also keep in mind that water at different latitudes may have a greater or less warmth (that is the reason why in some areas it is said that its boiling point is not 100 degrees Celsius but around 83).

The warmer the water, the more amphibian mortality because there will be more infection since the microorganism manages to survive in an environment suitable for its needs.

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If a DNA molecule is found to be composed of 40% thymine, what percentage of guanine would be expected.
Likurg_2 [28]

Answer:

10%

Explanation:

Chargaff postulated the complementary base pairing rule, where he stated that in the DNA molecule, Adenine (A) will always pair with Thymine (T) and Guanine (G) with Cytosine (C) i.e. A-T, G-C

Chargaff stated that the concentration of purines (Adenine and Guanine) is always equal to that of pyrimidines (Thymine and Cytosine) i.e. {A} + {G} = {C} + {T}

These equal concentration equals 100% in totality i.e. A+G+C+T= 100%

Thymine pairs with Adenine, if there is 40% of Thymine in the DNA molecule, it means there will be 40% of Adenine also. 40 + 40 = 80%. This leaves us with 100-80 = 20% for Guanine and Cytosine.

Since there will be an equal amount of Guanine and Cytosine too, Guanine will therefore, be 20/2 = 10%.

That is, 10% Guanine, 10% Cytosine.

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3 years ago
How do mutations increase variety
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Transposable elements make up 44% of the human genome. What is thought to be their function?
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Transposable elements are considered to be responsible for vast range of genome diversity and gene silencing.

Explanation:

Transposable elements are short sequences of DNA that have the ability to move from one location to another in the genome. During this process they copy themselves.

The entire process carried out by transposable elements to copy themselves and move from one location to another is called transposition.

Transposition may result in mutation and is potentially a major source of genome diversity and change. If a transposon inserts itself into the coding region of a gene,it interrupts the coding sequence and inactivates the gene expression.

In addition to this, a transposable element may contain transcription or translation termination signal that will block the gene expression downstream of insertion site.

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Explanation:

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