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3 years ago

2. Chemicals that absorb light are called

Biology

2 answers:

Bumek [7]3 years ago

7 0

Answer:

Chemicals that absorb light are called Pigments. 3. Chlorophyll makes plants look green because it Reflects green light.

Explanation:

coldgirl [10]3 years ago

4 0

Answer:

pigments

Explanation: Chlorophyll makes plants look green because it Reflects green light.

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The amount of living material in an ecosystem. *

grandymaker [24]

The answer is d. Food chain

4 0

2 years ago

Read 2 more answers

Write 6054 in standard form

gayaneshka [121]

6.054 x 103 Is your answer!!!

7 0

3 years ago

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Sequence of amino acids in a polypeptide chain of protein molecule coresponds to the sequence of nucleotides on mRNA for that pr

tamaranim1 [39]

Answer:

330

Explanation:

A codon is the sequence of three nucleotides on mRNA that refers for particular amino acid during translation (protein synthesis) process. The four nucleotides arrange themselves in various combinations to produce different codons. The tRNA with corresponding anticodon attach the particular amino acid to polypeptide chain during translation.

Remember there is always a stop (UAA) and start codon (AUG) for the synthesis of polypeptide and stop codon does not contribute for any amino acid. It just terminate the polypeptide chain synthesis. We know that a codon is made up of three nucleotide so our calculation will be.

993-stop codon =990

990/3=330

So that's why 330 amino acid will be incorporated in the polypeptide chain.

6 0

3 years ago

A classic example of selection in natural populations involves the peppered moth Biston betularia in England. Industrial gases k

Anit [1.1K]

Answer:

Dark colored moth

Explanation:

Moths either dark or light live on the bark of the trees. During industrial revolution in England, excessive pollution caused the darkening of bark of trees. Due to this environmental change, some of the light colored moths evolved and turned into dark colored moths. Both bark and moth being dark in color, made the moths untraceable by their predators. While the light colored moths on dark trees were easily recognizable by their predators.

Hence, the dark colored moths possess high fitness.

7 0

2 years ago

How many grams of urea (non volatile, non electrolyte) must be added to 1250. g water to give a solution with a vapor pressure l

Lady bird [3.3K]

Answer:

$\large\boxed{\large\boxed{107g}}$

Explanation:

The vapor pressure lowering is a colligative property and it follows Raoult's law.

The vapor pressure lowering of a solvent in a solution, ΔP, is equal to the mole fraction of the solute, Xsolute, multiplied by the vapor pressure of the pure solvent, P°.

$\Delta P=X_{solute}\times P^0$

ΔP and P⁰ are given:

ΔP = 1.39mmHg

P⁰ = 55.32mmHg

1. Mole fraction of solute

Thus, you can calculate Xsolute:

$1.39mmHg=X_{solute}\times 55.32mmHg\\\\X_{solute}=0.02513$

2. Moles of solute

Now you can calculate the number of moles of water and the number of moles of solute.

Number of moles of water = mass in grams / molar mass

Number of moles of water = 1,250g/18.015 (g/mol) = 69.3866mol

Xsolvent = 1 - Xsolute = 1 - 0.02513 = 0.97487

Xsolvent = moles of solvent / moles of solution

0.97487 = 69.3866mol / moles of solution

moles of solution = 71.1752mol

moles of solute = moles of solution - moles of solvent = 71.1752mol - 69.3866mol = 1.7886mol

3. Mass of urea

Formula:

Mass = number of moles × molar mass

Mass = 1.7886 mol × 60.06 g/mol = 107.42 g

You must round to 3 significant figures: 107 g

8 0

3 years ago