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Black_prince [1.1K]

3 years ago

13

The bald eagle almost went extinct when humans began using a pesticide called DDT. What can you conclude from the fact that bald

eagle numbers have since rebounded?

1 answer:

pashok25 [27]3 years ago

3 0

Answer:

. Humans re-shape their environment, putting pressure on other species.

Explanation:

You might be interested in

What is a passage followed by magma in a volcano

Anni [7]

It's called a conduit.

Hope this helped!

6 0

3 years ago

Help i cant think please i will give branliest

Paul [167]

Answer:

A

Explanation:It boils down to a and b. A single molecule of DNA is wrong. So it's a,

8 0

3 years ago

A single-celled zygote develops into a multicellular organism with specialized cells through the processes of

iren2701 [21]

Answer:

mitosis

Explanation:

The zygote undergoes a process known as mitosis, in which it replicates its chromosomes (which carry each parent's DNA) and then divides, resulting in two identical cells. These cells are called totipotent and have the ability to develop into a new organism

4 0

3 years ago

Proteins are important food nutrients. A technician working at a food company is interested in the nutritional content of seeds/

Vladimir79 [104]

Answer: Sample 1 then, has more variety of proteins but less quantity of each one, while sample 2 has less variety but more quantity of the two proteins present.

Explanation:

Proteins are molecules found in the cells of all living organisms. A protein is composed of monomers called amino acids linked together by peptide bonds. To analyze proteins, a technique called SDS-PAGE (sodium dodecyl sulfate polyacrylamide gel electrophoresis) is used. <u>This technique is used to separate proteins according to their electrophoretic mobility, depending on polypeptide chain length, molecular mass, post-translational modifications and other factors</u>. SDS (sodium dodecylsulfate) is an anionic surfactant compound that breaks non-covalent bonds in proteins, denatures them causing these protein molecules to lose their native conformation and provides the polypeptide with a negative charge that is proportional to the chain length (the number of amino acids) and, therefore, to the molecular mass of the protein. The electrostatic repulsion created by the binding of SDS to the protein is one of the causes of the protein losing its native conformation, thus eliminating the differences in conformation of the different proteins to be separated in the gel.

An electric current is applied to the gel where the proteins are seeded, causing the negatively charged proteins to migrate through the gel in the direction of the anode (positively charged region). Short proteins will move more easily and faster through the pores of the gel, while larger proteins will find it more difficult to do so. After a certain time, the proteins will have migrated according to their size (measured in kDa or kiloDaltons). After electrophoresis, the gel should be stained with Coomassie blue or silver stain, allowing visualization of the separated proteins. After staining, the different proteins will appear as distinct bands on the gel. In addition, the higher the amount of a protein, the more intense the color of its band will be.

Extract No. 1 shows three bands: 25, 30 and 35 kDa. <u>This means that it has three different proteins</u>, each with a different molecular weight. Extract number 2 shows two bands: 25 and 35 kDa. <u>It means that this sample has only 2 proteins. And being bands of higher intensity, we can say that there is more of each protein.</u>

Sample 1 then, has more variety of proteins but less quantity of each one, while sample 2 has less variety but more quantity of the two proteins present.

8 0

3 years ago

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