BIOLOGY MIDDLE SCHOOL

Devise a serial dilution scheme to prepare 1/20, 1/40, and 1/80 dilutions of a disinfectant

Answers

Answer 1
Answer:

Answer:

The serial dilution can be done by half- logarithmic dilution method.

Explanation:

  • This is also called the Ten-fold dilution method.
  • The process involves the following steps, and the volumes represented are arbitrary.
  1. From the concentrated solution of the disinfectant take 1 ml of disinfectant in a falcon tube. 9 ml of water is added to that. Here we get a solution which is  (1)/(10) diluted.
  2. Take 1 ml of the above (1)/(10) diluted solution in another falcon and add 9 ml of water to it. Here we will get a solution which is  (1)/(20) diluted.
  3. Take 1 ml of the above (1)/(20) diluted solution in another falcon and add 9 ml of water to it. Here we will get a solution which is  (1)/(40) diluted.
  4. Take 1 ml of the above (1)/(40) diluted solution in another falcon and add 9 ml of water to it. Here we will get a solution which is  (1)/(80) diluted.
Answer 2
Answer:

Final answer:

To prepare a serial dilution, you start with the stock solution and dilute it step-by-step. For a 1/20 dilution, take 1 part solution and add 19 parts solvent. For a 1/40 dilution, dilute the 1/20 solution further by taking 1 part of the 1/20 dilution and adding 1 part solvent. Similarly, for a 1/80 dilution, take 1 part of the 1/40 dilution and add 1 part solvent.

Explanation:

To prepare a serial dilution, you start out with a stock solution (in this case, the disinfectant) and dilute it step by step. To prepare the 1/20 dilution, you take 1 part stock solution and add 19 parts solvent. Then for a 1/40 dilution, you can dilute the 1/20 solution by a further factor of 2: take 1 part of the 1/20 dilution and add 1 part solvent. The same principle applies for the 1/80 dilution: take 1 part of the 1/40 dilution and add 1 part solvent, or you could take 1 part of the original stock solution to 79 parts of solvent.

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How does selective breeding support Darwin's hypothesis about evolution?

Answers

Over the year of evolution, only the strongest survived and reproduced. So, having this happen over millions of years, species got stronger and stronger. For example, if there were two species of monkey's, one with fangs, one without fangs. The species with fangs would survive, and soon all monkeys would develop fangs because all the monkeys without them would die and not reproduce. That's how the evolved into what animals are today.

Answer:

It does not support his hypothesis but it gave him a clue about selecting desired characteristics. Replace the breeder by the opportunities that are in the environment and you have it.  Breeders depend on variations to deliver new characteristics. If reproduction did not vary between generations, breeders will not get any new characteristics

according to David Chan,

I need all answers !! graded !
help please

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Answer:

Where are the questions though?

When it is summer in the southern hemisphere it is winter in the

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northern hemisphere

In which way are desert plants best adapted to live in a dry area

Answers

Desert plants are best adapted to live in a dry area due to their ability to conserve water and tolerate high temperatures.

What are adaptations of desert plants?

Desert plants have a range of adaptations that help them survive in arid environments, including:

  • Reduced leaves or spines instead of leaves to minimize water loss through transpiration.

  • Deep and widespread roots to absorb water from deep underground sources.

  • Succulent stems or leaves to store water.

  • CAM photosynthesis that allows them to fix carbon dioxide at night and close stomata during the day to minimize water loss.

  • Ability to shed leaves during dry seasons to conserve water.

  • Thick waxy cuticles on leaves to reduce water loss through evaporation.

  • Crassulacean acid metabolism (CAM) photosynthesis that allows them to fix carbon dioxide at night and close stomata during the day to minimize water loss.

These adaptations help desert plants to conserve water, tolerate high temperatures, and thrive in hot and dry environments.

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Plants like cacti are able hold water for a very long time after it rains.

A pack of wolves kill and eat a deer. What kind of interaction takes place between the wolves and the deer?

Answers

This is predation. A predator-prey relationship. The predator catches the prey, kills and eats it for food.

Answer:

predator/pray

Explanation:

i did it on study island

Kemukakan beberapa pendapat kamu tentang kitab kitab allah swt. sebelum al-quran

Answers

Some of the holy book of Allah SWT before the Qur'an are the Tawra revealed to Musa (Moses), the Zabur revealed to Dawud (David), the Injil revealed to Isa (Jesus)

Further explanation

The Islamic religion views is that God, who is above all merciful, constantly sends prophets and apostles to remind humans of God's "straight path". And also to reminds the distinction between permitted (halal) and prohibited (haram)

The Quran was orally revealed by God to the final Prophet, Muhammad, through the archangel Gabriel (Jibril). The Holy Quran, is the last book of Allah (SWT) conveying the message of kindness, absolution and peace for human kind.

Some of the holy book of Allah SWT before the Qur'an are the Tawra (Torah or the Law) revealed to Musa (Moses), the Zabur (Mizmor/Zemirot or Psalms) revealed to Dawud (David), the Injil (Euangélion/Ewwangelliwon or the Gospel) revealed to Isa (Jesus)

The word Torah occurs eighteen times and the name of Moses is mentioned 136 times in the Quran. Whereas Zabur occurs three times in the Qur'an (4, 163; 17, 55; 21, 105), and the word Injil occurs twelve times in the Qur'an and refers to the revelation transmitted by Isa.

Learn more

  1. Learn more about the holy book of Allah SWT brainly.com/question/1103786

Answer details

Grade:  9

Subject: Islamic religion

Chapter:  holy book of Allah SWT

Keywords:  holy book of Allah SWT
Allah mengutus quran sebagai bukti dan mukjizat bagi orang yang percaya untuk melihat. Juga untuk orang-orang yang tidak mahu mengakui bahawa Allah adalah satu-satunya tuhan. Ini adalah kepercayaan orang-orang Islam. Itulah sebabnya Allah memanggil mereka " Ayat " kerana mereka adalah mukjizat daripada orang -orang yang beriman. 
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