PLEASE ANSWER. THIS IS A QUESTION FOR MY PROJECT DUE TOMORROW.

1 answer:

5 0

Graphite is a mineral composed of stacked sheets of carbon atoms with a hexagonal crystal structure. It is the most stable form of pure carbon under standard conditions. Graphite is very soft, has a low specific gravity, is relatively non-reactive, and has high electrical and thermal conductivity.

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One of your lab partners has followed the recommended procedure of running Gram-positive and Gram-negative control organisms on

andreyandreev [35.5K]

Answer:

Reduced in holding time of decolrization step and also used less Alcohol because decolrization step is important in Gram's staining.The decolorization step must be performed carefully. Otherwise over-decolorization may occur. This step is critical and must be timed correctly otherwise the CV stain will be removed from the Gram-positive cells. If the decolorizing agent is applied on the cell for too long time, the Gram-positive organisms to appear Gram-negative..

Explanation:

Gram' staining is a technique used in microbiology labs to differentiate between Gram's positive and negative

Gram-positive bacteria :Stain dark purple due to retaining the primary dye called CV in the cell wall.

:Gram-negative bacteria Stain red or pink due to retaining the counter staining dye called Safranin or neutral red.

There are four basic step in Gram" staining

1) Application of the Primary Stain to a Heat-Fixed Smear of Bacterial Culture

2)Addition of Gram's Iodine

3)Decolorization with 95% Ethyl Alcohol:Alcohol or acetone dissolves the lipid outer membrane of Gram-negative bacteria, thus leaving the peptidoglycan layer exposed and increases the porosity of the cell wall. The CV-I complex is then washed away from the thin peptidoglycan layer, leaving Gram-negative bacteria colorless.

On the other hand, alcohol has a dehydrating effect on the cell walls of Gram-positive bacteria that causes the pores of the cell wall to shrink. The CV-I complex gets tightly bound into the multi-layered, highly cross-linked Gram-positive cell wall thus staining the cells purple.

The decolorization step must be performed carefully. Otherwise over-decolorization may occur. This step is critical and must be timed correctly otherwise the CV stain will be removed from the Gram-positive cells. If the decolorizing agent is applied on the cell for too long time, the Gram-positive organisms to appear Gram-negative. Under-decolorization occurs when the alcohol is not left on long enough to wash out the CV-I complex from the Gram-negative cells, resulting in Gram-negative bacteria to appear Gram-positive.

7 0

3 years ago

Copper is a mineral commonly used in electronics. Copper ore deposits were created by volcanic activity. Heat and pressure creat

Sholpan [36]

Answer:Copper is a mineral commonly used in electronics. Copper ore deposits were created by volcanic activity. Heat and pressure creates copper ore and deposited it in sedimentary rock layers. Copper is considered a resource.

Explanion:

its already the answer

6 0

2 years ago

It's considered to be an advantage to have lungs with increased capacity, because with increased capacity

matrenka [14]

Having more lung capacity is advantageous because the lungs can expand more. More air in the lungs will fill all the alveoli (air sacs in the lungs) and allow more oxygen to enter the bloodstream via the capillaries that surround the air sacs. Excess waste (such as carbon dioxide) is also transferred from the blood to the air to be exhaled. As lungs fill, more gas exchange can occur.

7 0

3 years ago

if a brown eyed man marriesa blue eyed woman and they have seven children,all of whom are browneyed.what is the fathers genotype

ser-zykov [4K]

The father has to be homozygous for brown eyes(BB) if his children all have brown eyes. Since, the brown eye gene is dominant over blue eyes. All his children will be heterozygous for Brown eyes (Bb).

6 0

3 years ago

A man has the genotype BBEE he has brown hair and free earlobes.What are the different combinations of these alleles in his gama

Ostrovityanka [42]

Answer: The correct answer is- BE, BE, BE, BE.

The genotype of man is BBEE (representing brown hair and free earlobes).

It has two different genes ( B and E, present in homozygous state that is with same allele) that are corresponding to two different traits of the organism.

As per the Mendel's law of segregation, the pair of allele (that depicts a gene variant) are separated from one another during the process of gamete formation.

As both genes are having same allele that is present in homozygous state ( BB and EE), thus, BE is the only combination that will be formed in the gametes of the organism.

3 0

3 years ago