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sergey [27]
3 years ago
13

Molecular models of two different substances are shown below. In the

Biology
2 answers:
AnnyKZ [126]3 years ago
6 0
The answer would be B.

H2O is polar and forms hydrogen bonds with itself but O2 is nonpolar and can only form weak(van der waals) interactions.
Dmitriy789 [7]3 years ago
3 0

Answer: Option B

Explanation:

The molecules that is described in the model is water H_{2}O and other molecule is O_{2} molecule.

Due to difference in electronegativity of hydrogen atom and oxygen atom there is partial positive charge on each hydrogen atom and partial negative charge on oxygen atom of O_{2} molecule.

Hence, water is a polar molecule.

Whereas in O_{2}, there is covalent bonding due to sharing of electrons. Hence, this molecule is covalend and hence, it is neutral in nature.

Therefore,  O_{2} is a non-polar molecule.

So, both the molecules are put together in the container then there will be no attraction in between them because water molecules contains charge but oxygen molecules does not contain any charge as they are neutral.

Thus, we can conclude that one molecule is polar and other is non polar so they do not attract each other.

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A bacterial sample has a cell density of 1.85 x106 CFU/mL. What plate dilution should yield a countable plate? Which two dilutio
insens350 [35]

Answer:

Explanation:

Bacterial count in stock- 1.85x10^6 cfu/ml

Dilution methods

Take 100 uL or (0.1ml) from stock and add to 900ul (0.9ml) saline and mixed it- this makes 10^1dilution.

Now take 100ul from 10^1 dilution and add to next 900ul saline this is 10^2 dilution, similarly do upto 10^5 dilution.

Then take 100ul from 10^ 4 and 10^5 dilution seperately and plate on LB agar plate seperetely and count the colonies.

Cfu/ml formula= (No.of colonies x dilution factor)/0.1 ml

So suppose, 18 colonies formed on 10^4 dilution then total no. Of cells in stock will be 18x10^4/ 0.1= 18x10^5 cfu/ml.

If we dilute 10^4 or 10^5 that's leads to colony count of 18-19 colonies on 10^4 dilution while 2 colonies should come on plate of 10^5 dilution.

7 0
3 years ago
what sequence represents the correct order of events for production of the necessary complex molecules after food is taken in by
leonid [27]
Digestion, Absorption, Circulation, Diffusion, Synthesis. 

Digestion begins as soon as you put food in your mouth and begin chewing it, so it is the first step. Absorption happens when food is converted into substances that can be absorbed by your GI tract. Circulation is where those nutrients are circulated in your lymphatic and circulatory system (blood). Diffusion moves oxygen through your blood stream where it gets diffused. S<span>ynthesis converts nutrients that have been diffused and absorbed in your blood. </span>
5 0
2 years ago
how does the word "haploid" apply to the gametes formed during meiosis. Why is it important that gametes are haploid instead of
liraira [26]

Meiosis only occurs in reproductive cells, as the goal is to create haploid gametes that will be used in fertilization. Meiosis is important to, but not the same as, sexual reproduction. Meiosis is necessary for sexual reproduction to occur, as it results in the formation of gametes sperm and eggs.

6 0
2 years ago
Which muscles act to propel food down the length of the pharynx to the esophagus?
Ksenya-84 [330]
Pharyngeal constrictor muscles (superior, middle and inferior)

The pharyngeal constrictor muscles are a group of muscles that form the lumen of the pharynx. After you swallow, an act that you have control, it starts a involuntary contraction by these muscles to propel  the bolus downwards.



4 0
3 years ago
Which statement about the geosphere is true?
nekit [7.7K]

The mantle being made of nickel and iron is the correct statement about the geosphere and  is denoted as option B.

<h3>What is Geosphere?</h3>

This is referred to the solid part of the earth and consists of rocky materials present in it.

The geosphere has the mantle which is made up of materials such as iron and nickel which are metals and are responsible for their rigid solid structure thereby ,making it the most appropriate choice.

Read more about Geosphere here brainly.com/question/842883

#SPJ1

7 0
1 year ago
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