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KengaRu [80]
1 year ago
7

The following table is a sample of the data Erwin Chargaff published in 1952.

Biology
1 answer:
Elza [17]1 year ago
6 0
The correct answer is C

<span>Erwin Chargaff's research found that there are two pairs of nucleotides in the DNA molecule, adenine-thymine, and guanine-cytosine. 
Those two pairs of nucleotides are complementary and since they pair up in the DNA molecule, the amount of one nucleotide in the pair must be equal to the amount of the other nucleotide of the pair. 
He also found that different species have different proportions of nucleotides, which proved that DNA is the carrier of genetic information, not the proteins.</span>
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Which two cellular organelles in eukaryotes have both electron transport systems and chemiosmotic mechanisms?
aalyn [17]

Answer:

Mitochondria and the chloroplast

Explanation:

Electron transport refers to the transfer of of electrons from electron donors to electron acceptors via a reduction-oxidation reaction.  

In the mitochondria the process is called Oxidative phosphorylation whereas in the Chloroplast it is called Photo-phosphorylation since it utilizes light.

Chemiosmotic mechanisms allow the movement of ions across a semi-permeable membrane down their electrochemical gradient.

In both mitochondria and chloroplast,have these mechanisms for the production of ATP .

7 0
1 year ago
A chemical equation lists CH3COOH(aq) as a reactant. What does (aq) indicate?
Dvinal [7]

Answer:

The compound is dissolved in water

Explanation:

"aq." is the abbreviation for "aqueous" ( watery).

In chemical equations the symbol (aq) means that the substance is dissolved in water.

3 0
1 year ago
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In which biome would you most likely find plants that grow far apart from one another, with narrow leaves and shallow roots? Why
stiks02 [169]
<span> A plant with narrow leaves and shallow roots would probably be found in the desert, where there is not a lot of water. Narrow leaves help prevent water loss. Shallow roots can spread out long distances in search of water. Plants living in the desert grow far apart from one another so that they don’t have to compete for limited amounts of water.</span>
8 0
1 year ago
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Two species of frogs belonging to the same genus occasionally mate, but the offspring fail to develop and hatch. What is the mec
cricket20 [7]

Answer:

The options

A. the postzygotic barrier called hybrid inviability

B. the postzygotic barrier called hybrid breakdown

C. the prezygotic barrier called hybrid sterility

D. gametic isolation

The CORRECT ANSWER IS A.

A. the postzygotic barrier called hybrid inviability

Explanation:

Postzygotic barrier is a mechanism that hinders reproduction after fertilization and zygote development. Hybrid inviability occurs when a mating between two organism produces a hybrid that can't strive past the embryonic stages.

In Reduced Hybrid Viability there is a lower tendency to survive for individuals whose parents possesses incompatible genetics, which may have result from sexual union of these parents from varying species.

These two frog species in this case study can be separated through the mechanism of the postzygotic barrier called hybrid inviability.

8 0
2 years ago
A purple flower with an unknown genotype is crossed with a white flower. Determine the genotype of the purple flower if purple (
Furkat [3]
If purple is dominant, the genotype of the purple flower could be PP or Pp, as both would give a purple colour. However, if the crossed flower turned out to be white, we could say with certainty that the genotype of the purple flower is Pp as the genotype of the white crossed flower would be pp, which would not be possible if the purple flower's genotype was PP.
5 0
2 years ago
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