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Amiraneli [1.4K]
2 years ago
14

A fellow student is unsure why his gram-negative Escherichia coli is purple. Upon examining the Gram stain kit, you notice it di

dn't have alcohol. What caused the bacteria to be purple instead of pink
Biology
1 answer:
icang [17]2 years ago
3 0

Answer:

if you are not using alcohol (95% ethanol), you are not decolorizing the wall of the gram-negative bacteria, which should get rid of the violet color, therefore the safranin stain, in the next step, won't be absorbed in the wall, and the bacteria will end up being purple due to the previous crystal violet stain of the gram-positive bacteria

Explanation:

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You have obtained genome nucleic acid from a sample and have determined the base content. Please identify the genome structure f
o-na [289]

Answer:

The genome is double stranded DNA molecule from a eukaryotic organism.

Explanation:

DNA is present as genetic material in all the living organism except some viruses. Viruses may contain DNA or RNA as their genetic material and has the ability to convert RNA into DNA.

The DNA contains  27% G; 23% A; 27% C; 23% T. This DNA follows the Chargaff's rule in which the amount of purines is equal to the amount of pyrimidine. Adenine is paired with thymine and both contains 23% of DNA. Guanine is paired with cytosine and both contains 27% of DNA. The genome is DNA as thymine is present and not uracil. This is double stranded DNA from the eukaryotes only.

3 0
4 years ago
How long does it take for a photon to travel through the convection zone
Bas_tet [7]

Answer:

50 million years

Explanation:

It can take a photon as long as 50 million years to travel all the way through the radiative zone. The convection zone surrounds the radiative zone. In the convection zone, hot material from near the Sun's center rises, cools at the surface, and then plunges back downward to receive more heat from the radiative zone.

3 0
2 years ago
You have mated a phenotypically wild-type female of the genotype Xy+w+Xyw to a male with the genotype XywY. You counted 2205 tot
Vinil7 [7]

Answer:

1.31 cM

Explanation:

Total offspring = 2205

Since two genes are involved, F1 progeny should have four types of combination. Out of them two are 17 and 12 which definitely means they are in lesser number. Since recombinants are always less than parental progeny in linkage, the given two types are recombinants.

Recombination frequency = (Number of recombinants / Total progeny) * 100

= [ ( 17 + 12 ) / 2205 ] * 100

= ( 29 / 2205 ) * 100

= 1.31 %

Map distance = Recombination frequency

Hence, distance between two genes = 1.31 cM

6 0
4 years ago
What biome should you live in if you enjoy a mountainous region with sparse summer vegetation; soil is frozen most of the year,
kap26 [50]
The biome you should leave on is tundra!!


Hope I could help!!
8 0
3 years ago
What would happen to the ecosystem when a keystone species, such as a wolf, is removed
andrew-mc [135]
This would affect the population of the rabbits isf this happens the increase of population on the rabbits then if theres an increase on the rabiits then there will be a limiting factor of food for them this will affect the carraying capacity of the ecosystem
5 0
3 years ago
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