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qaws [65]
3 years ago
15

A single nucleotide of DNA is composed of whichof the following substances?

Biology
2 answers:
Fiesta28 [93]3 years ago
7 0
The correct answer is choice D
Elena-2011 [213]3 years ago
7 0
The substance is D. deoxyribose sugar, a phosphate group, and a nitrogenous base
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Predict what the effect of a powerful fungicide that killed almost all fungi have on humans and animals. The humans and animals
tangare [24]
B. The amount of waste would build up and the toxins produced would harm the animals and humans
8 0
3 years ago
An enzyme contains a catalytic histidine residue in its active site that must release an R group proton to solution in order to
hjlf

Options missing:

a) The pH of the environment should be relatively high.

b) The pH of the environment should be relatively low.

c) The pH of the environment would not matter.

d) The environment should be set to the biochemical standard state.

Answer:

a) The pH of the environment should be relatively high.

Explanation:

For optimal function an enzyme needs a certain environment or condition. As temperature increases, the rate of enzyme activity also increases. As temperature increases toward its optimum point of 37 degrees Celsius (98.6 F), hydrogen bonds relax and make it easier for the hydrogen peroxide molecules to bind to the catalase.

The part of the enzyme where this reaction takes place is called the active site. A temperature that is higher or lower than this optimum point changes the shape of the active site and stops the enzyme from working. This process is called denaturation.

Enzyme pH levels also change the shape of the active site and affect the rate of enzyme activity. Each enzyme has its own optimal range of pH in which it works most effectively. In humans, catalase works only between pH 7 and pH 11. If the pH level is lower than 7 or higher than 11, the enzyme becomes denaturated and loses its structure. The liver sustains a neutral pH of about 7, which creates the best environment for catalase and other enzymes.

General acid catalysis would require histidine to be protonated at pH values (pH 8.0) optimal for enzymatic activity which is relatively high.

3 0
3 years ago
Please help me....... ​
vichka [17]

Answer:

13. cytoplasm

6. microscope

7. tissue

5.organ system

15. organ

5 0
3 years ago
A flounder lies motionless on the sandy bottom of the ocean floor. It blends in so well with its environment that predators cann
uranmaximum [27]

Answer:

The first one is It helps the founder defend itself

The second one is A viceroy butterfly has the same markings as a bad-tasting monarch butter fly

The third one is Mimicry if im wrong do grouping

The fourth one is The light moths will be captured by predators more easily than the dark moths, and the population of the dark moths will rise

The fifth one is TBH i cant answer it i dont see the table

The sixth one is The green insect population will increase and the yellow insect population will decrease

The seventh one is A penguin uses sleek, smooth belly feathers to slide on ice

The eight one is Digging holes and tunnels for food

Explanation:

I answered these on the most logical reasons. I did not search these up anyways if im wrong tell me the ones that were wrong.

3 0
2 years ago
Staphylococcus epidermis appears _________, whereas escherichia coli appears _________ after the gram stain.
BigorU [14]

Staphylococcus epidermis appears stained, whereas Escherichia coli appears stainless after the gram stain.

Staphylococcus is a Gram-Positive Bacteria i.e. it takes up the Gram stain.

Escherichia coli or E. coli is a Gram-Negative Bacteria i.e. it does not take up the Gram stain.

Gram Staining is done by immersing the bacterial sample in a solution of dye and then observing it under microscope after proper rinsing.

Gram Positive Bacteria are those bacteria that show a positive outcome on staining. Gram Positive Bacteria appear Stained after staining.

Gram Negative Bacteria are those bacteria that show a negative outcome on staining. Gram Negative Bacteria does not take up the stain and appear stainless.

The epidermis of Staphylococcus which is a Gram-Positive Bacteria appears to take up the stain whereas Escherichia coli which is a Gram-Negative Bacteria does not take up the stain.

Staphylococcus epidermis appears stained, whereas Escherichia coli appears stainless after the gram stain.

Learn more about Gram-Positive Bacteria here, brainly.com/question/13756030

#SPJ4

3 0
2 years ago
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