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Amiraneli [1.4K]
3 years ago
5

A student creates a gram stain on a bacterial sample that has a mix of gram-negative and gram-positive organisms. The student ac

cidentally forgets the decolorizer step. What would the outcome of the gram stain be?
Biology
1 answer:
amm18123 years ago
3 0

Answer:

All the bacteria would appear purple(gram- positive)

Explanation:

Gram stain is used for distinguishing gram-positive and gram-negative bacteria. Gram-positive bacteria appear purple because it does not gets destain after decolorizing step and gram-negative bacteria appears read or pink because it gets decolorized after decolorizing step and then it gets stained by safranin which provides a pink color to gram-negative bacteria.

So if a student forgot the decolorizing step then gram-negative bacteria will not get decolorized and will not take safranin stain so even gram-negative cells will appear violet. Therefore all the bacteria will appear violet or purple(gram-positive).

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What is the expected phenotype of F1 progeny from a cross between two homozygous recessive mutants disrupted in different genese
LenaWriter [7]

Answer:

The correct answer would be - wildtype.

Explanation:

Let assume there are four genes which are :

A-B-C-D

In mutant first, the genotype would be:---a-b-C-D

In the mutant second, the genotype would be:--A-B-c-d

If both of these genotypes are crossed with each other, the recessive genes a, b of mutant first is dominated and masked the expression by the dominant genes present in the mutant second.

Similarly, the recessive genes of the mutant second are dominated and masked expression by the dominant genes of mutant first.  This is possible only due to different genes are present in mutants.

Thus, the correct answer is - The correct answer would be - wildtype.

6 0
3 years ago
Why is vinegar used in food preservation?
weqwewe [10]
Vinegar is an extremely acidic liquid. Very few microorganisms (ie bacteria and fungus which cause foods to spoil) can survive in such an acidic environment. Among other effects, it can destroy their cell walls, and prevent their own enzymes working (enzymes are extremely pH sensitive). There are a small number of microorgamisms which are adapted to survive in extreme acidity. However, this adaptation prevents them from surviving in more 'normal' environments. Therefore, anything which can survive in the vinegar, will not likely survive on your kitchen surface, and the same is true the other way around. Therefore, as vitually nothing can colonise whatever is in the vinegar, the food will be very effectively preserved. . . . . . . . . . . you can say........................ . . the low pH a nd high acidity of vinegar destroy bacteria
3 0
3 years ago
The parasitic sac fungus that grows on rye and other grains and contains the hallucinogenic chemical lysergic acid is?​
liubo4ka [24]
It is one of the most powerful mood-altering chemicals. It was discovered in 1938 and is made from lysergic acid, which is found in ergot, a fungus that grows on rye and other grains.
7 0
2 years ago
An area of raised land in the middle of a river. Mountains and glacier in the distance. A geologist finds this ridge of sediment
Nadusha1986 [10]

A moraine is a landform feature which is formed by the glacier retreating. The ridge of sediments that geologists found has a feature namely moraine.

<h3>What is moraine?</h3>

The materials usually soil or rocks left behind by the glaciers are called moraine.

Just like rivers that carries all sorts of debris and silt and eventually builds up to form deltas, similarly glaciers moves all sorts of dirt and boulders that assembles to form moraines.

As the geologist found a ridge of sediments and notices a glacier in the distance so this is the moraine.

Thus, the correct answer is C.

For more details regarding moraine, visit:

brainly.com/question/3791076

#SPJ1

8 0
2 years ago
construct an explanation for the high incidence of tusklessness in the Gorongosa elephant population.
Setler79 [48]

Answer:

Argument: A trend toward an increased incidence of tusklessness will result in decreased population sizes in the

future.

Claim: In the long term, tusklessness in African elephants is not beneficial to populations, even when heavy

poaching is occurring. So, as tusklessness increases, elephant population sizes will decline.

Evidence: Although poachers kill elephants with tusks, elephants rely on their tusks for survival. Elephants use

their tusks to strip bark off trees for food and to dig up water and minerals from the ground. Male elephants

also use their tusks in competitions with other males for females.

Reasoning: Tuskless elephants are probably not as healthy as those with tusks, as they cannot eat bark off trees

and are unable to dig for water and minerals. During harsh conditions such as droughts, elephants without

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mating competitions. If too many males are injured or killed, there may be a decline in reproduction.

Over time, many of the tuskless elephants will die or be unable to reproduce, so the population’s size will

decrease.

Explanation:

6 0
3 years ago
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