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3 years ago

During prophase, each pair of chromosomes is attached to each other by the _____. chromatin chromatid centromere DNA

Biology

2 answers:

ser-zykov [4K]3 years ago

5 0

Answer:

Centromere

Explanation:

hp this helps!

notka56 [123]3 years ago

4 0

Answer is centromere.

Mitosis is a method of cell division in which a cell divides into two identical daughter cells. During mitosis separation duplicated genetic material is done. This division completed in five different phases namely prophase, metaphase, anaphase and telophase.

During prophase, the duplicated pairs of chromosomes get condensed are called sister chromatids. The pair of chromosomes remain joined at a central point called the centromere (a special part of a chromosome where the two identical sister chromatids are attached).

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Does photosynthesis or ce produce carbon dioxide

JulsSmile [24]

In the process of photosynthesis glucose is produced from carbon dioxide and water <span />

5 0

3 years ago

Read 2 more answers

I don't what it wants me to answer, if you understand it please help

Over [174]

Hello!

An initial observation is the first thing a scientist notices about a topic before conducting the experiment. We can see that it is the first thing in the paragraph in this case, that dandelions grow as unwanted weeds in many lawns.

The hypothesis is the guess about the result of an experiment made before the experiment is conducted. In this case, it is that a weed killer (Killimal) would kill all the dandelions while leaving the grass healthy. This is not specifically a guess made by the scientist, but more like a prediction he wanted to verify.

An independent variable is the variable being changed in the experiment by the scientist. Here, it is whether Killimal was sprayed or not.

The dependent variable is the variable being measured, and the one being affected by the independent variable. His observation would be whether the grass and dandelions would be killed. This is because the weed killer would be directly affecting whether or not these would be killed.

The control variables are ones which are kept the same in the experiment as to not interfere with the final results. In this case, it would be the density of dandelions, the amount of sunlight, and the amount the plants were watered. These were kept exactly the same, as they could've affected the dependent variable if changed.

The control group was the one that is not impacted by the independent variable. The control group makes sure that it actually is the independent variable affecting the dependent, and it isn't some outside unknown variable. This would be the plot without the Killimal.

The experimental group is the one being experimented on from the independent variable. This would be the plot with the Killimal.

Hope this helps!

8 0

3 years ago

The principle that the geologic processes that we see today have occurred throughout Earth’s history is called____.

nignag [31]

Answer:

A. Uniformitarianism

Explanation:

The principle of Uniformitarianism was proposed by a Scottish Geologist, James Hutton.

The principle is simply stated as "the present is the key to the past".

The processes that have occurred in geologic past is still in play today. By looking at rock sequences in our present day, we can actually have a firm grasp of the processes they have undergone in the past.

8 0

3 years ago

The possession of one or more extra sets of chromosomes (relative to an ancestral condition) is called __________.

Debora [2.8K]

Answer:

Polyploidy

Explanation:

4 0

2 years ago

1. How many food chains make up the food web?

viva [34]

Answer:

A food web can be formed by more than one food chain, since the webs includes all possible interactions that can occur between individuals of different trophic levels.

Explanation:

Based on the scheme shown in the image

<h3>1. How many food chains make up the food web? </h3>

This food network is made up of three food chains

<em>Plant → Bird → Snake</em>
<em>Plant → Insect → Bird → Snake</em>
<em>Plant → insect → Frog → Snake</em>

Food webs often include several food chains, since they are due to the interaction between organisms at different trophic levels, which actually happens within an ecosystem.

<h3> 2. Which organism is an herbivore? </h3>

In this case, both the insect and the bird are herbivorous organisms, since they feed of the producer, which is the plant.

<h3> 3. Which organism is an autotroph? </h3>

The only autotrophic organism is the plant, since it is capable of manufacturing its nutrients from sunlight and inorganic matter.

<h3> 4. Which organism is a third-order heterotroph? To what trophic level does that organism belong? </h3>

The third order heterotroph is the snake, since it feeds on other animals. The snake is a carnivore and can be a secondary or more commonly tertiary consumer, so it can be placed in the 3rd or 4th trophic level.

<h3> 5. Which organism is an omnivore? </h3>

According to the scheme proposed, the bird is omnivorous, since it feeds on both plants and insects.

<h3> 6. Which organisms belong to more than one food chain? </h3>

In this case, the plant, the insect, the bird and the snake are part of more than one food chain.

<u><em>Plant → Bird → Snake</em></u>
<u><em>Plant → Insect → Bird → Snake</em></u>
<u><em>Plant → insect</em></u><em> → Frog → </em><u><em>Snake</em></u>

<h3> 7. Which organism belongs to more than one trophic level? </h3>

The bird can be located in both the second and third trophic level, being a primary consumer —when it feeds on plants— or secondary, when it feeds on insects.

<h3> 8. What are decomposers? From which trophic levels are the organisms that decomposers feed on? </h3>

Decomposers are generally bacteria and fungi, organisms capable of degrading organic matter, thus enriching the soil. Decomposers can feed on any trophic level.

<h3> 9. What does a pyramid of energy show about the amount of energy available at different trophic levels of a food chain? </h3>

As the ascent of the pyramid occurs —or at the upper trophic level— the amount of energy available decreases. This is because from one trophic level to another only 10% of the energy can be used. If a plant has 5000 Kcal available, the herbivore that consumes it can only use 500 Kcal.

<h3> 10. Why do different trophic levels have different amounts of energy?</h3>

The main <u>reason for the difference in energy in each trophic level is that energy is lost in each one of them</u>, which the organisms use in their metabolism. A consequence of the metabolism is the loss of energy as heat, which is acquired by the environment.

8 0

3 years ago