Summarize this cycle in your own words (2-3 sentences minimum).

nadya68 [22]

Answer:

Without veggies, you're more prone to digestive disorders such as constipation, hemorrhoids, and diverticulosis. Owy! Vegetables contain cellulose, which increases stool weight, eases passage, and reduces transit time.

3 0

3 years ago

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Which of these measurements was made with the most precise measuring device: 8.1956 m, 8.20 m, or 8.196 m? Explain your answer.

marta [7]

8.1956m because it gave you to the 10,000th place of measurement

8 0

3 years ago

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Help is needed I’m new plz don’t come at me

Sidana [21]

Explanation:

7.the fallopian tube is also known as the oviduct

8.menstruation

5 0

3 years ago

A protein has a molecular mass of 400 kDa when measured by gel filtration. When subjected to gel electrophoresis in the presence

RoseWind [281]

Answer:

subunit composition

how many: 4 subunits
what sizes: 160 kDa, 60 kDa, 90 kDa, and 90 kDa.

Explanation:

SDS is a detergent that denaturalizes the protein and sets a relation charge size, such as that the motion of the protein in the gel is proportional to its weight. However, the detergent can not disrupt disulfide bridges, so these bonds remain together. The bigger the protein is, the stronger interaction with the polyacrylamide gel there will be. The speed of displacement in the electromagnetic field is inversely proportional to the protein size.

On the other hand, b-mercaptoethanol acts as a reductive agent, breaking disulfide bonds. This chemical produces a complete denaturalization resulting in the unfolded protein. If disulfide bridges kept two protein subunits together, the b-mercaptoethanol separates them.

So, the most important data we need to consider here is that SDS can not disrupt disulfide bridges, while b-mercaptoethanol can.

Available data:

A protein has a molecular mass of 400 kDa
SDS → three bands with molecular masses of 180, 160, and 60 kDa
SDS + b-mercaptoethanol → three bands with molecular masses of 160, 90, and 60 kDa

SDS

180 + 160 + 60 = 400 kDa

SDS + b-mercaptoethanol

160 + 90 + 60 = 310 kDa

The difference between them is 400 - 310 = 90 kDa, meaning that there is a subunit of 90 kDa that is not being detected by SDS alone.

From both measures ( SDS and SDS/b-mercaptoethanol) we can assume that subunits 160 kDa and 90kDa are the same. So the difference is in the left subunit ⇒ 180 and 90, respectively.

180 - 90 = 90 kDa

We can assume that the 180 kDa subunit is composed of two 90 kDa subunits joined by a disulfide bridge. SDS alone could not disrupt this bond, so it detected a unit of 180kDa. b-mercaptoethanol detected this bond and broke it, generating two 90 kDa units, which migrated together in the gel, so they were expressed as the same band.

This difference suggests that the protein is formed of 4 subunits. One of them is 160 kDa, another one is 90 kDa, and the last two subunits are 90 kDa each.

3 0

3 years ago

In each drawing, there are lines between each atom and each molecule. What do you think the lines between atoms represent? The l

Zigmanuir [339]

Answer:

Atoms are the smallest units of matter that still retain the fundamental chemical properties of an element. Much of the study of chemistry, however, involves looking at what happens when atoms combine with other atoms to form compounds. A compound is a distinct group of atoms held together by chemical bonds. Just as the structure of the atom is held together by the electrostatic attraction between the positively charged nucleus and the negatively charged electrons surrounding it, the stability within chemical bonds is also due to electrostatic attractions. To illustrate further, consider the two major types of chemical bonds: covalent bonds and ionic bonds. In covalent bonds, two atoms share pairs of electrons, while in ionic bonds, electrons are fully transferred between two atoms so that ions are formed. Let’s consider both types of bonds in detail.

Explanation:

6 0

3 years ago

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