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3 years ago

What must happen before a chemical reaction can begin?

Biology

2 answers:

Free_Kalibri [48]3 years ago

6 0

Before a chemical reaction can start energy must be absorbed by the reactants. The amount that must be absorbed to start the reaction is called the activation energy. you're right, t<span>he activation energy must be reached.</span>

Alik [6]3 years ago

4 0

Answer:

The correct answer is that the activation energy must be reached.

Explanation:

In order to start a chemical reaction, energy is needed. A certain amount of energy is needed in order to get started. This energy is termed as activation energy. A reaction would not take place unless the molecules or atoms of reactants come together. This takes place only when the particles are in motion, and for motion, energy is required.

The reactants have to overcome forces, which push them away from each other, and the bonds present in the reactants are needed to get dissociated, for both these purpose energy is required. Thus, before the beginning of a chemical reaction, the activation energy must be reached.

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Answer the following?

exis [7]

Answer: ° Pop Beads represent two pair of homologous sister chromatids.

° In terms of number and kinds of chromosomes, Chromosomes number will be the same, Also Similarity of genetic information will be the same.

°Interphase

Prophase

Metaphase

Anaphase

Telephase

° In terms of number and kinds of chromosomes; resulting cells will resemble only half of the chromosome. Also, there will not be exact correspondence in similarity of genetic information as their parents.

° Haploid Cells (n) are cells that contains a single set of chromosomes e.g sex cells (egg or sperm cell)

Diploid cells (2n) are cells that contains two set of homologous chromosomes. A vivid example of these are the somatic cells.

° Chromosomes are replicated only once in meiosis.

° Chromosomes are pulled to opposite poles in meiosis only twice.

° Crossing Over also known as genetic recombination can be defined as the exchange of genetic materials between two homologous chromosomes non sister chromatids which pair up to form recombinant chromosomes.

Explanation:

Since we have questions with multiple attachments, repetition of words will be avoided and those that need explanation will be our focus.

1° When we hear Pop Beads, it's pertinent to think biologically that Pop Beads are used in tracking chromosomal DNA movements in Cell Division.

Thus, Pop Beads represent extensions of homologous Sister Chromatids

2° Let's recall : that both diploid and haploid cells can undergo mitosis. Mitosis is a division of a cell nucleus in which the genome is copied and separated into two identical halves. Hence, in terms of numbers and kinds of chromosomes; if (for example) a diploid cell undergoes mitosis, the resulting cells will be two identical diploid cells i.e (2n = 2n).

Therefore, chromosomal number and genetic information will be the same.

4° In meiosis, cell division occurs that reduces the chromosomes number by half, giving rise to four haploid cells, each genetically different from their original (parent) cells.

Hence, in terms of numbers and kind of chromosomes, the resulting cells will produce half of the chromosomes. Also, genetic information will differ from their original cells.

6° If we look at what Chromosomal replication is, we'll realize that: it's a biological process of producing two identical replicas of chromosomes from one original chromosomal molecule.

In meiosis, chromosomal replication occur "ONCE" . But there are two rounds of cell division. (Meiosis 1) where exchange of genetic information of takes place and (Mieosis 11) where daughter cells divides and splits up into sister chromatids to form haploid gametes.

7° Like we said earlier, Chromosomes are pulled to opposite poles in meiosis only "TWICE".

The first occurs at (ANAPHASE 1), when a pair of chromosomes are pulled apart by meiotic spindle, which in turns pulls one chromosome to one pole of the cell and the other chromosomes to the opposite pole.

In (meiosis 11), Chromosomes are pulled to opposite poles at (ANAPHASE 11); when daughter cells line up along the equator and centrioles are now at opposite pole creating avenue for meiotic spindle fibre to attach to each sister chromatids at ends of each poles.

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3 years ago

S. pyogenes is a gram-positive bacterium. gram-positive bacteria have structural differences that distinguish them from gram-neg

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The method may be easily applied in order to obtain additional information for clinical prescriptions from. By new method, we could easily distinguish gram-positive and gram-negative bacteria in liquid culture media within 10 min. This modest and fast technique may be beneficial for determining the treatment course of patients with UTIs, particularly for those without a prior history of UTIs.

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3 years ago

Give three examples of the color changes that can be seen with pH indicators.

Andru [333]

Answer:

IndicatorLow pH colorHigh pH colorBromocresol greenyellowblueMethyl redredyellowMethyl purplepurplegreenAzolitmin (litmus)redblue

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2 years ago

Theodor W. Engelmann illuminated a filament of algae with light that passed through a prism, thus exposing different segments of

WARRIOR [948]

Answer:

The correct answer is C and Engelmann conducted this experiment to prove relationship between algae and the rate of photosynthesis.

Explanation: First we must talk about 3 facts:

1) Prism scatters the white light into different wavelengths.

2) Photosynthesis, 6 carbon dioxide and 6 water molecules are consumed and 6 oxygen and 1 sugar molecule is synthesized using light energy.

6CO2 + 6H2O → C6H12O6 + 6O2

3) Aerobic bacteria breaks down sugar while using oxygen and produces water and carbon dioxide in simplified terms.

So with this experimental setup a researcher can understand the rate of the photosynthesis by increased accumulation of aerobic bacteria near algae in certain wavelengths since they uses oxygen and tend to move close to the oxygen source (<u>see figure</u>). In this experiment there are no ways to measure heat (B), there is no known relation between wavelength of light and aerobic respiration since it can happen even in the dark (A) and finally there are no ways to measure carbon dioxide (D).

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3 years ago

Disturbances to an ecosystem, such as fires and floods, are often seen as negative. Describe a situation where

trasher [3.6K]

Answer:

A biological community in which association takes place between the organisms and their physical surroundings is termed as an ecosystem. It can also be defined as an association between the nonliving and living components found within the environment. A particular geographical region, which is specified for the species thriving within it is known as a biome.

A branch of science, which deals with the natural procedures that comprise fire within an ecosystem and the ecological influences it imparts, the association between the biotic and the abiotic constituents of an ecosystem with the fire, and the role played by fire within an ecosystem is termed as a fire ecology.

Different kinds of ecosystems like savanna, prairie, coniferous forests and chaparral have originated by the contribution of the fire, which plays an essential role in the renewal and vitality of the habitat. Different kind of plant species needs the assistance of fire to establish, to reproduce, or to germinate. In case, if the suppression of wildfire takes place, it will eventually result in the eradication of various plant species and the animals that rely upon them.

4 0

3 years ago