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Semmy [17]
3 years ago
6

"An oxygen-rich environment would cause a mass extinction of prokaryotes."

Biology
1 answer:
Flauer [41]3 years ago
6 0

<u>Answer: </u>

"An oxygen-rich environment would cause a mass extinction of prokaryotes."  Supports current scientific theories of how life might have originated on Earth.

<u>Explanation: </u>

The reacting power of oxygen increases rigorously in an oxygen- rich environment, which leads to huge fire ignition even with the slightest spark which is generally non hazardous at all. Many prokaryotic organisms do not need oxygen as they perform anaerobic respiration. Oxygen is dangerous for some prokaryotes.  

There were some prokaryotic organisms who were giving out oxygen as waste. Such excess amount of oxygen was hazardous for the environment and hence mass extinction was required to keep a check on the excess amount of oxygen being released.  

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Which of the following is the best definition of DNA?
mr_godi [17]

Answer:

Option B. A double-stranded molecule with coded instructions for anorganism's physical characteristics, is the correct statement.

Explanation:

DNA is a genetic material which contains information about the physical features and characteristics of an organism. It is composed of five carbon sugar, phosphate group and nitrogenous base. The DNA base are adenine, cytosine, guanine, and thymine.

8 0
3 years ago
In a population of lizards, the allele that causes red eyes (R) is dominant, while the allele that causes green eyes is recessiv
zhenek [66]
The answer is 0.47 or 47%.

Let's first distinguish some terms and their frequencies.
R - the dominant allele that causes red eyes
r - the recessive allele that causes green eyes

Since R is dominant over r, lizards with at least one dominant R allele will have red eyes. Therefore, the genotypes and the phenotypes are as following:
genotypes - phenotypes
RR              - the lizards with red eyes
Rr               - the lizards with red eyes
rr                - the lizards with green eyes

Now, we will use some Hardy-Weinberg equations:
p + q = 1
p² + 2pq + q² = 1

where:
p - the frequency of dominant allele R
q - the frequency of recessive allele r
p² - the frequency of lizards with genotype RR
2pq - the frequency of lizards with genotype Rr
q² - the frequency of lizards with genotype <span>rr
</span>
We are interested in <span>the frequency p of the dominant R allele.
</span>So, we have the frequency (72%) of the lizards that have red eyes. However, lizards with genotypes RR and Rr will have red eyes. Since their frequencies are p² and 2pq, respectively, we have:
p² and 2pq = 72% = 72/100 = 0.72

Now, use this in the equation p² + 2pq + q² = 1:
0.72 + q² = 1
q² = 1 - 0.72 = 0.28

From here, we will calculate q and later p using the formula p + q = 1:
q² = 0.28
q = √0.28 = 0.53

p + q = 1
p + 0.53 = 1
p = 1 - 0.53
p = 0.47
5 0
3 years ago
Read 2 more answers
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cricket20 [7]

Answer:

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Explanation:

3 0
3 years ago
Which viral genome is likely to require an RNA-dependent RNA polymerase for transciption upon viral entry?
Inga [223]

Answer:

(-) sense single-stranded RNA

Explanation:

Negative sense refers to viruses that use the negative sense single stranded RNA as their genetic material.

It is essential for the negative viral strand is complimentary to the mRNA so it is converted to a positive RNA by RNA polymerase.  

Negative sense single stranded RNA virus require an RNA dependent RNA polymerase for transcription.  This is because it essential in encoding proteins by catalyzing the complimentary RNA strand to the given RNA tempelate.  

6 0
3 years ago
Scientist have observed many mysteries of plants.
Mnenie [13.5K]

Answer:

True

Explanation:

Yes, scientists have observed many mysteries of plants.

6 0
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