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seropon [69]
3 years ago
14

How many factors should a well-designed experiment test at one time? A. 1 B. 2 C. 3 D. depends on the number of experiment varia

bles
Biology
2 answers:
pishuonlain [190]3 years ago
8 0
A well-designed experiment should<span>  </span>test  1 factor at one time.
devlian [24]3 years ago
3 0
The well - designed experiment test one factor at a time. The answer to the question above is letter A. 1. The items that are being tested are the independent variables and that they cause the dependent variables to change.
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This is a large, covalently-bonded molecule that has a repeated structural unit
Tasya [4]

This is a large, covalently-bonded molecule that has a repeated structural unit. This is a complex carbohydrate made from many different sugar molecules joined together. A macromolecule that contains carbon, hydrogen, oxygen, and nitrogen, which is used by the body for growth and repair.

5 0
3 years ago
Read 2 more answers
the diagram below represents two cells, x and y which statement is correct concerning the structure labeled A ?
DaniilM [7]

The diagram below (attached image) represents two cells, X and Y.

Which statement is correct concerning the structure labeled A?

A) It is involved in cell communication in cell X but not in cell y.

B) It represents a cell wall in cell X and the cell membrane in cell y.

C) It prevents the absorption of CO2 in cell x and O2 and cell y.

D) It aids in the removal of metabolic waste in both cell X and Y ​

Cell membrane accomplishes several functions, among them, the removal of cell wastes. Option D. It aids in the removal of metabolic waste in both cell X and Y.

<h3>What is the cell membrane?</h3>

The cell membrane is a barrier that surrounds the cell content and isolates it from the extracellular space. It is composed of two lipidic layers, proteins, and glucans incrusted in between.

The cell membrane accomplishes many different functions. Among them, we can mention,

  • Isolation ⇒ It separates the intracellular content from the extracellular space.

  • Protection ⇒ It protects the interior of the cell from any damaging external factor that might affect its correct functioning.

  • Transport ⇒ It allows the selective pass of certain molecules or ions.

Substances interchange

⇒  Passive transport → Simple diffusion → through lipids

                                     → Facilitated diffusion → Assisted by channel  

                                        proteins

                                     → Does not need energy

                                    → Depends on the molecule size, the concentration                      

                                       at each side of the membrane, and the charge of      

                                       the ions.

                                      → Occurs in favor of the electrochemical gradient

⇒ Active transport → It does the energy to occur

                                → Mediated by carrier proteins

                                → Transport big-sized molecules

                                → Against the electrochemical gradient

⇒ Endocytosis/Exocytosis → Active transport mediated by vesicles.  

  • Communication ⇒ By emission and reception of substances and molecules, the cell can communicate with other cells. This process is always mediated by membranes and their transport proteins or receptor proteins.

In the exposed example X cell represents an animal cell, and Y cell is a plant cell.

Both the animal and plant cells are eukaryotic. They carry their genetic material in the nucleus and mitochondria. Organelles are located in the cytosol, and both of them are surrounded by a protector cell membrane.

Among the options, the correct one is D. It aids in the removal of metabolic waste in both cell X and Y

You can learn more about cell membranes at

brainly.com/question/13524386

#SPJ1  

7 0
2 years ago
Duncan was a subject in a clinical study that was designed to determine the effects of certain diets on health. While participat
Phantasy [73]

Answer:

The missing options are:

- steroid hormones

- carbs

- essential fatty acids

- PHO

The correct answer is essential fatty acids.

Explanation:

Essential fatty acids are the fats that our body can not produce by itself, but that are essential for the function of the body, so we have to consume foods that have these fats, such as fish, oysters, nuts, chia seeds, soybean oil, etc. The deficiency of these fats causes skin problems, alopecia, anxiety, depression, among other things.

6 0
3 years ago
An immune system cell called the plasma cell produces thousands of antibodies (a type of protein) per second for release into th
Olenka [21]

Answer:

a. the rough endoplasmic reticulum

Because it is the site of protein synthesis.  

and all of the other organelles have no relation to protein and handling especially peroxisomes which detoxifies h202 and helps with intracellular digestion similar to the lysosomes and microtubules only function is for locomotion of prokaryotic cells and some eukaryotic cells like the sperm cell also they make up spindle fibers used to bind and separate chromosomes/chromatids in mitosis and meiosis.

5 0
3 years ago
How do round, spiral, and rod-shaped bacteria look like?
AnnZ [28]
There are thousands of bacterial species and they are not identical towards one another, therefore there forms are quite unique. so its just there characteristics that make up how bacteria look like.
Hope this answers your question. 

8 0
3 years ago
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