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3 years ago

How many blades of grass are there in your random sample area?

Biology

2 answers:

wariber [46]3 years ago

6 0

blades = 1011 blades of grass / km2 * 29 million km2 = 3 * 1018 blades of grass

vovikov84 [41]3 years ago

4 0

<h3>Answer & Explanation:</h3>

Let's assume there are 10 blades of grass per square centimeter. This means there are 100.000 blades of grass per square meter and 100.000.000.000 blades of grass per square kilometer.

The surface area of earth is 5.1 * 108 km2

The surface of earth is roughly 70.8% water (Ibid), which means that 29.2% is land. Of these 29.2% approximately 20% is grass

This means the surface area of all grass areas combined is:

Area_of_grass = 5.1 * 108 km2 x 29.2 % x 20 % = 29 million km2

Hence,

blades = 1011 blades of grass / km2 * 29 million km2 = 3 * 1018 blades of grass

This is approximately 418 million blades of grass per person alive.

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Which of the following is a rock created when a comet dies near the sun due to the evaporation of its water and ice particles?

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Meteroid is the outcome

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3 years ago

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2. How could one change in a DNA nucleotide alter the formation of the translated protein

vichka [17]

Answer AND Explanation:

Proteins are formed from the translation of mRNA to amino acid. Each set of 3 nucleotides make up a codon that codes for a specific amino acid. Frameshift mutations can also impact the formation of the protein. A change in a nucleotide does not always change the amino acid or protein because some amino acids have more than one set of 3 nucleotides that code for them. Valine, for example, is coded for by GUU, GUC, GUA and GUG. A change in the last nucleotide wouldn't affect the amino acid formed. However,GAG codes for glutamic acid.

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4 years ago

The ability of the human body to break down the red color in beets is controlled by an autosomal dominant allele. The inability

Zinaida [17]

Answer:

Explanation:

Let the ability to break down the red color in beets be represented by the allele B. The inability would be represented by the allele b.

A nonsecretor's genotype would be BB or Bb while a secretor's genotype would be bb.

A nonsecretor woman with a secretor father would be a carrier with genotype Bb. A nonsecretor man who in a previous marriage had a secretor daughter would also be a carrier with genotype Bb. If the two marries:

Bb x Bb

BB 2Bb bb

(a) probability of their first child will be a secretor girl = probability of having a girl and being a secretor.

Probability of having a girl = 1/2

Probability of being a secretor = 1/4

probability of their first child will be a secretor girl = 1/2 x 1/4 = 1/8

(b) Probability of their first child being a nonsecretor girl = probability of having a girl and being a nonsecretor.

Probability of having a girl = 1/2

Probability of being a nonsecretor = 3/4

Probability of their first child being a nonsecretor girl = probability of having a girl and being a nonsecretor = 1/2 x 3/4 = 3/8

2. Probability that their first two children will be nonsecretors of either sex = probability of their first being a nonsecretor and of either sex and probability of their second being a nonsecretor and of either sex.

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4 years ago

Energy enters a food chain as heat energy and leaves it as light energy.

hjlf

Answer:

The statement that says "Energy enters a food chain as heat energy and leaves it as light energy" is false.

Explanation:

The energy that enters the food chains, first of all, is light energy from the sun. This energy is assimilated by plants to convert it into chemical energy, through photosynthesis.

When energy flows from producers, plants, to consumers and decomposers, a great amount of energy is lost, in the form of heat energy, due to the metabolism of living beings. Additionally, the second law of thermodynamics states that when energy passes from one form to another it leads to disorder in the system, which would also explain the loss of energy.

The true statement is "Energy enters a food chain as light energy and leaves it as heath energy".

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3 years ago

If an inhibitory synapse fires at the same time and at the same distance from the initial segment as an excitatory synapse of th

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Answer:

If an inhibitory synapse fires at the same time and at the same distance from the initial segment as an excitatory synapse of the same intensity there will be no changes in the potential in the firing zone.

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Under normal conditions, the transmembrane potential depends on the ionic charges present in the intracellular and extracellular spaces. The extracellular space load is usually positive and in the cytoplasm is negative.

Depolarization occurs by opening ion channels that allow sodium to enter the cell, making the intracellular space more positive.
An opening of potassium channels releases this ion to the extracellular space, leading to hyperpolarization.

An excitatory synapse is one capable of depolarizing a cell and boosting the production of action potential, provided it is capable of reaching the threshold of said potential.

On the other hand, an inhibitory synapse is able to hyperpolarize the cell membrane and prevent an action potential from originating, so that they can inhibit the action of an excitatory synapse.

The interaction between two synapses, one excitatory and one inhibitory, -called synapse summation- will depend on the strength that each of them possesses. In this case, the intensity of both synapses being the same, there will be no changes in the membrane potential in the firing zone.

Learn more:

Excitatory and inhibitory postsynaptic potentials brainly.com/question/3521553

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