BIOLOGY HIGH SCHOOL

Which statement correctly explains the polarity of the water molecule?A.The hydrogen end of the molecule has a partial negative charge and the oxygen end has a partial positive charge.



B.The oxygen end of the molecule has a partial negative charge and the hydrogen end has a partial positive charge.



C.Both ends of the molecule have a partial negative charge, which attracts the other water molecule towards itself.

Answers

Answer 1
Answer: The oxygen end of the molecule has a partial negative charge and the hydrogen end has a partial positive charge. This is because of the electronegativities of the atoms O and H. O is more electronegative than H so electrons are more often around the O atom. Electrons are negatively charged, so this causes the partial negative charge on the O atom, similarly, the "deficiency" of electrons around the H atoms cause partial positive charges because the nuclear charge (protons) isn't balanced to the number of electrons around it.

Hope this helps :)

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Euglena is microbial eukaryote that has chloroplasts and can thus perform phtosynthesis. When deprived of light and treated with specific chemicals in lab, the chloroplasts are completely destroyed. Based on the information above, if we re-expose Euglena to light what do you predict will happen?
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Which kinds of cells are always single-celled?

Answers

Prokaryotes- bacteria, archae

Final answer:

The cells that are always single-celled are prokaryotic cells and include bacteria and archaea. These cells do not have a nucleus and are much simpler than eukaryotic cells, which can form multicellular organisms. However, some eukaryotic organisms like yeast and protozoa, can also remain single-celled during their entire lifecycle.

Explanation:

The kinds of cells that are always single-celled are called prokaryotic cells and include bacteria and archaea. These cells do not have a nucleus and are much simpler than eukaryotic cells, which can form multicellular organisms. Each prokaryotic cell functions independently, and despite their simplicity, they are extraordinarily diverse and adaptable, capable of surviving in an array of environments from Arctic ice to volcanic vents.

It's also worth noting that some eukaryotic organisms like yeast and protozoa while being more complex and having nuclei, can remain as single-celled organisms for their entire lifecycle.

Learn more about Single-celled organisms here:

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Can you live without your large intestine? Why or why not?

Answers

no we cannot live without our large intestine because it is the only place where waste products gets deposited, it is also responsible for excretion .
No, we cannot live without our large intestine. The large intestine is concerned with the absorption of water and it is from where proper excretion occurs. If there is no large intestine, then we may have to suffer with excretory products ( faeces ) in our blood which will hamper our co-ordination.

Which points should be included when the mother of an epileptic child is being counseled? select all that apply?

Answers

There are choices for this question namely:

1. The child should wear a medical alert bracelet.
2. The child should be given valproic acid with milk to reduce gastric irritation.
3. The parent should keep a journal of signs and symptoms before, during, and after seizures.
4. The child should discontinue the drug immediately and the parent should notify the primary healthcare provider if a rash develops.
5. The parent should understand that chewable forms of antiepileptic drugs are recommended for once-a-day administration.

The correct answers are 1, 3, and 4. Having the child to wear a medical alert bracelet leads to easy information to the surroundings and healthcare practitioners as this can be helpful in identifying emergency situations. Having a journal of signs and symptoms before, during, and after seizures are helpful especially in providing the patient's healthcare provider with accurate information. If a rash develops, the child should discontinue the drugs as this can be a sign of allergic reactions that may progress to anaphylaxis and ultimately anaphylactic shock. Valproic acid should not be mixed with milk as this won't reduce the irritation but will aggravate the mucosal irritation. Chewable forms of anti-epileptic drugs are not recommended for once a day administration.

Farah is doing an experiment that involves calculating the speed of a longitudinal wave. What will most likely happen if she increases the temperature in the room?

Answers

The speed of a longitudinal wave will not be affected by the temperature of its surrounding. Base on the formula for the wave speed (applicable on longitudinal wave), wave speed ( speed in m.s 2) is equal to the distance of a wave (wavelenth in meter) travel over a unit of time  (seconds) or wave speed is equal to distance of a wave times the frequency (hertz), temperature is not included in calculating the wave speed.

Explanation:

In the given problem, Farah is doing an experiment that involves calculating the speed of a longitudinal wave

For example, Sound wave is a longitudinal wave. It travels faster in solid than liquid and gas as the solid is more denser.

The speed of the sound increases with the temperature. At higher temperature, the molecules have more kinetic energy. They can vibrate faster. The sound wave can travel faster. The speed of the sound in the room temperature is 346 m/s.

If Farah increases the temperature then the sound wave travels faster.

What is the difference between Darwin's theory of evolution and Lamarck's theory of evolution ?

Answers

Darwin believed that organisms changed gradually over time,but Lamarck thought they changed suddenly.Lamarck believed that organisms could acquire characteristics during their lifetime that they could pass down to their offspring,but Darwin did not believe these traits could be passed down.Darwin believed that species are still changing,but Lamarck believed they had stopped.Lamarck believed that evolution occurred randomly,but Darwin thought it was the result of predetermined plan.Hope this help you!

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Answers

Every year 20,000 species go extinct. Thus, the correct option for this question is D.

What is Species?

Species may be defined as a cluster of organisms that can significantly reproduce with one another in nature in order to produce fertile offspring. It involves identical organisms that interbreed with one another in order to exchange genes. It is responsible for creating fertile organisms.

Species extinction is the ecological force that derives the mechanism of elimination of species from their native environment. This stimulates due to varieties of external influences like lack of food, space, mating selection, involvement of human activities, the action of predators, etc.

So, due to these external influences, it is found in research that approximately 20,000 species go extinct every year.

Therefore, every year 20,000 species go extinct. Thus, the correct option for this question is D.

To learn more about Species extinction, refer to the link:

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Every year 20000 species go extinct. C.20000
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