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Korvikt [17]
3 years ago
8

What are the roles of a catalyst in the energetics of a chemical reaction?

Biology
1 answer:
7nadin3 [17]3 years ago
4 0

Answer:

The correct answer is: catalysts lower the activation energy of the reaction.

Explanation:

Catalysts are substances that in our bodies are commonly represented by enzymes (specialized proteins) and that are used in chemical reactions to speed them up.

In order to achieve this, catalysts lower the activation energy of chemical reactions, which is a value of energy that must be obtained for the reaction to actually happen.

Catalysts are constantly used in our bodies and are responsible for the proper functioning of every organ. These catalysts can be used over and over again because they are not consumed in the reaction.

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How do pockets increase a lung´s surface area?
icang [17]

Answer:

many alveoli are present in the lungs with a shape that further increases surface area. Thin walls - alveolar walls are one cell thick providing gases with a short diffusion distance. Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface.

Explanation:

8 0
3 years ago
The stained Gram-positive bacteria appear _____ under the microscope.
jolli1 [7]
After crystal violet staining, the Gram-positive bacteria may appear dark blue or violet. The cell wall of gram positive bacteria have thick peptidoglycan layer, thus it retains the crystal violet stain compared to gram negative bacteria.
4 0
3 years ago
A culture medium on which only gram-positive organisms grow and a yellow halo surrounds staphylococcus aureus colonies is called
ELEN [110]
I believe the most appropriate is a selective medium and differential medium. Selective medium types are formulated to support the growth of one group of organism, but inhibit the growth of another. Blood agar is a differential medium that distinguishes bacterial species by their ability to break down the red blood cells included in the media. Blood agar is often used to distinguish between the different species of pathogenic streptococcus bacteria.
4 0
3 years ago
When the oxyhemoglobin curve shifts during exercise what is the result?
jek_recluse [69]
It releases bound oxygen into your body's tissues.
4 0
3 years ago
On a hot summer day in Florida, Sarah was having a picnic with her family. She took a glass,
Simora [160]

Options were missing from the question so the options are:

A.From the ice cube to the glass.

B. From the lemonade to the glass.

C. From the lemonade to the ice cube.

D. From the ice cube to the lemonade.

Answer:  Option C

Explanation:

The main principle of heat transfer is that heat always flows from the hotter body to the colder body.

Here, the hotter body is thermos in which the lemonade was kept and the colder body is cooler in which the ice was kept.

During the mixing of lemonade into ice, the heat will from the hotter body to the colder body which means from lemonade to the ice. This process of heat transfer is unidirectional( hot body to cold body).

Hence, the correct answer is option C.

4 0
3 years ago
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