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Svet_ta [14]
3 years ago
12

Hi everyone!:) i just need help with this science question in my textbook!

Biology
1 answer:
Katyanochek1 [597]3 years ago
7 0

Answer: In a simple sense, growth in population is a good thing as it means that a species is thriving and doing well in its environment as well as reproducing at desirable rates.  However, if population continues and continues to grow it will eventually reach a cap where an environment can no longer hold more members of that specific species because there is a limit on food and places of shelter.  This leads to natural rises and declines in a species over time (which can be very predictable as well.)  A downside to rapid and sustained population growth is that if a species keeps growing and growing without reaching its cap (which happens a lot with introduced species into an environment which were not there naturally) is that they can overrun and destroy a natural environment and damage the ecosystem.  Animals and species which are already there can have their population numbers drastically reduced because of this invasive species and may be forced to move to a new area.

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How would a cell send a protein to another cell? Discuss the process starting from the Nucleus and ending in the other cell.
faltersainse [42]

Answer:

Explanation:

Suppose that you have a very precious piece of information. Let’s imagine that this piece of information is a blueprint. In fact, it’s not just a blueprint for a house, or a car, or even a top-secret fighter jet. It’s a blueprint for an entire organism – you – and it not only specifies how to put you together, but also provides the information that enables every cell in your body to keep functioning from moment to moment.

Sounds important, right? You’d probably want to keep information this valuable in a secure spot, perhaps in a protected vault where you can keep an eye on it. In fact, that’s exactly what eukaryotic cells do with their genetic material, placing it in a membrane-enclosed repository called the nucleus.

Eukaryotic DNA never leaves the nucleus; instead, it’s transcribed (copied) into RNA molecules, which may then travel out of the nucleus. In the cytosol, some RNAs associate with structures called ribosomes, where they direct synthesis of proteins. (Other RNAs play functional roles in the cell, serving as structural components of the ribosome or regulating activity of genes.) Here, we’ll look in a little more detail at the structure of the nucleus and ribosomes.

[Do all cells have just one nucleus?]

The nucleus

The nucleus (plural, nuclei) houses the cell’s genetic material, or DNA, and is also the site of synthesis for ribosomes, the cellular machines that assemble proteins. Inside the nucleus, chromatin (DNA wrapped around proteins, described further below) is stored in a gel-like substance called nucleoplasm.

Enclosing the nucleoplasm is the nuclear envelope, which is made up of two layers of membrane: an outer membrane and an inner membrane. Each of these membranes contains two layers of phospholipids, arranged with their tails pointing inward (forming a phospholipid bilayer). There’s a thin space between the two layers of the nuclear envelope, and this space is directly connected to the interior of another membranous organelle, the endoplasmic reticulum.

Nuclear pores, small channels that span the nuclear envelope, let substances enter and exit the nucleus. Each pore is lined by a set of proteins, called the nuclear pore complex, that control what molecules can go in or out.

If you look at a microscope image of the nucleus, you may notice – depending on the type of stain used to visualize the cell – that there’s a dark spot inside it. This darkly staining region is called the nucleolus, and it’s the site in which new ribosomes are assembled.

3 0
3 years ago
An experiment is done on 90 people to test their vitamin D levels: 30 are given vitamin D tablets, 30 are told to spend 15 minut
Jet001 [13]

Answer:

The correct answer is -

The control group: the group of people with no supplements and kept inside.

The dependent variable: Vitamin D level in all groups.

The independent variable: the source of vitamin D (sun or tablets)

Explanation:

The control group of any experiment is the group of subjects that did not receive any type of treatment or did not manipulate by the independent variable. Here the group of 30 people that kept inside and did not get supplements is the control group.

The independent variable is a variable that directly affects the dependent variable by a change in the independent variable. In this experiment, the sunlight and vitamin D tablets are independent variables that affect the vitamin D level in people.

The dependent variable is a variable that is affected by the independent variable or depends on the independent variable, vitamin level is the dependent variable.

3 0
3 years ago
All bacteria are classified as <br> a. prokaryotes. <br> b. eurkaryotes <br> c. protista.
fredd [130]
They are prokaryotes
6 0
3 years ago
The picture below shows the wind patterns around the Earth.
Crank

Answer:

C

Explanation:

because wind is generally caused my the heating of the earth surface by the sun

7 0
3 years ago
What is the range for the following set of measurements? 27ºC, 12ºC, 31ºC, 19ºC, 23ºC, 11ºC, 17ºC A. 27ºC to 17ºC B. 1ºC C. 0ºC
Westkost [7]

Answer:

D. 11ºC to 31ºC

Explanation:

In mathematics, the range of a set of numbers is the difference between the highest value in the set with the lowest value in the set. Therefore, all the numbers in between these two values would be part of the range of the set. Knowing this we can see that the highest value in this set is 31ºC while the lowest value in the set is 11ºC. Therefore, the range of this set would be 11ºC to 31ºC

5 0
2 years ago
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