Enzymes are proteins that speed up chemical reactions in the body how do they workA. they increase the surface area of reactants
B.they increase the concentration of reactants
C.they decrease the concentration of products
D. They act as reactants

Answers

Answer 1

Answer: The answer would be D, Enzymes are soluble protein molecules that can speed up chemical reactions in cells. These reactions include respiration, photosynthesis and making new proteins. For this reason enzymes are sometimes called biological catalysts.

Answer 2

Answer:

Answer:

D) They act as reactants

Explanation:

I took the test.

Hope this helps!!

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The first major source of oxygen gas was _____.a. volcanic outgassing
b. meteorite impacts
c. cyanobacteria
d. banded iron formations

Answers

The first major source of life on Earth was c. cyanobacteria. These organisms produce food by using energy from the sun; they are photosynthetic organisms. Over millions of years these organisms used CO2 in the air for photosynthesis and released oxygen as a byproduct. Over time oxygen concentrations rose high enough to support life.

The word that best fits in the blank in the sentence, "The first major source of oxygen gas was _____" is cyanobacteria. Thus, the answer is letter C. Cyanobacteria are blue-green algae and they are believed to have caused the "great Oxidation Event".

The falling of rain, snow, hail, or ice pellets from the atmosphere is called watering

precipitation

perception

Answers

Precipitation is when water falls from the clouds in one form or another.
Watering isn't the right term.
Perception is seeing something.

Answer:

Precipitation

Explanation:

For the balanced equation shown below, if the reaction of 77.0 grams of CaCN2 produces 26.1 grams of NH3, what is the percent yield?CaCN2+3H2O=>CaCO3+2NH3

Answers

%yield = 86.93%

Further explanation

Given

Reaction

CaCN₂+3H₂O=>CaCO₃+2NH₃

Required

The percent yield

Solution

mol CaCN₂(MW= 92 g/mol) :

= mass : MW

= 77 g : 92 g/mol

= 0.834

From equation, mol NH₃ :

= 2/1 x mol CaCN₂

= 2/1 x 0.834

= 1.668

Mass NH₃(theoretical):

= 1.668 mol x 18 g/mol

= 30.024 g

% yield = (actual/theoretical) x 100%

%yield = (26.1/30.024) x 100%

%yield = 86.93%

Carrying capacity is _____.the ratio of predators to prey
the number of populations in a specific area
the number of organisms in a population
the number of organisms an ecosystem can support

Answers

Carrying capacity is the number of organisms an ecosystem can support. It is the maximum size of a population that can survive in the ecosystem. If the animals reach the carrying capacity, the population may crash. As the consequence, the number of animals will decrease due to predators or diseases.

The answer is: number of organisms an ecosystem can support.

Groups of cells that work together are called .

Answers

group of tissues form a cell , and a group of cells form an organ

43 A sample of helium gas is in a sealed, rigid container. What occurs as the temperature of the sample is increased?(1) The mass of the sample decreases.(2) The number of moles of gas increases.
(3) The volume of each atom decreases.
(4) The frequency of collisions between atoms increases.

Answers

Answer is: (4) The frequency of collisions between atoms increases.

The average kinetic energy of molecules depends on the temperature.

As temperature increases, molecules gain more energy from surrounding and move faster and have more collisions.

Kinetic energy (standard unit is the joule J) depends on speed of the molecule.

Charles' Law (The Temperature-Volume Law) - the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature:

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When temperature goes up, the volume also goes up.

The best answer is (4) The frequency of collisions between atoms increases, for we are providing the atoms with energy.
Hope this helps~

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