Explain how it might happen that a human offspring with 47 chromosomes could be produced

Answers

Answer 1

Answer: Whenever the sperm and the egg combine, it is possible for one or the other to not split properly and bring 2 of the chromosomes instead of just 1

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3 examples of proteins in living organisms

Answers

3 examples of proteins in living organisms:
1. Collagen - maintains firmness and structure to body cells and tissues, keeping them together.
2. Keratin - creates the protective barrier for living organisms like skin, nails, and hair.
3. Globular and trans-membrane - supports the regulation of the flow of small ions and molecules such as sodium and glucose.

Which of the following is the adaptation that allows animals to survive in high altitudes, which contain lower levels of oxygen?a. migration
b. higher levels of hemoglobin
c. insulating feathers
d. higher body temperatures

Answers

The correct answer is option b. higher levels of hemoglobin.

The partial pressure of the oxygen decrease as the height from the sea level is increased. Due to the decrease in the partial pressure, the amount of the oxygen delivered by the hemoglobin to cell decrease. So, in order to cope up the condition, the amount of the hemoglobin in the blood is increased. the increased amount of the hemoglobin delivers more oxygen than the normal amount of hemoglobin can do, so, it help in survival at low oxygen levels.

Higher levels of hemoglobin means that an organism is able to survive off less oxygen. Hemoglobin moves oxygen around the body which allows the organism to survive with less of it, especially if the organism has more hemoglobin.

Q1. When the chromosomes line up in mitosis this is known as which phase?

Answers

Metaphase: when chromosomes line up

Metaphase is when the chromosomes line up in the middle

Heat moves through liquid and circulates due to density

Answers

When heat moves through liquid and circulates to density, this process is called convection. This process opens the possibilities of hotter thus,less dense material to go up and the colder one, thus denser material, to go down under the influence of gravity which eventually results heat transfer.

This is called convection

Which anatomical adaptation helps an elephant regulate its body temperature?A. Large ears increase surface area so that more heat is lost by radiation.

B. A large stomach stores a lot of water to make up for moisture loss due to sweating.

C. A large trunk smells water from far away and guides the elephant to it.

Answers

I think the correct answer from the choices listed above is option A. The anatomical adaptation which helps an elephant regulate its body temperature are its large ears increase surface area so that more heat is lost by radiation. Heat can be released as they flap these ears.

What do anaerobic organisms have in common with photosynthetic organisms?A.) They both appeared on Earth at about the same time.
B.) They both can only exist as single-celled organisms.
C.) They both need an energy source in order to survive.
D.) They both produce carbon dioxide as a waste product.

Answers

Ans is option C. They both need an energy source in order to survive.

Energy is an absolute necessity to survive on this earth. All living organisms need energy be it anaerobic or photosynthetic. Photosynthetic organisms can make their own food in the presence of sunlight by photosynthesis and harness energy from it. Anaerobic organisms can also make their own food in the absence of sunlight with the help of inorganic molecules like hydrogen sulfide (H2S), ammonia (NH3), sulphur (S) etc.

Its just that anaerobic organism's way of harnessing energy is different from those of aerobes/photosynthetic organisms but they need energy source for sure.

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