The enzyme maltase will break down the sugar maltose into which of the following components?

Which factors are common to both gradualism and punctuated equilibrium?

allochka39001 [22]

Migration, genetic drift, speciation, and natural selectio are the factors are common to both gradualism and punctuated equilibrium. Gradualism meaning gradual and suddenly happened, while punctuated equilibrium means taking over time.

5 0

3 years ago

Read 2 more answers

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

The theory that earth's rocks formed in a global flood followed by uplifting of some rock over a short period is called

nekit [7.7K]

The answer is catastrophism.

Catastrophism is a theory explaining that the Earth has been affected by sudden catastrophes which created its geological features. Some of the proposed catastrophes is a global flood followed by an uplifting of some rock which happened sudden, in a short period of time. It is opposite theory to uniformitarianism which explains that the Earth was formed in slow changes.

3 0

3 years ago

Fast breeder reactors are seldom used anymore because of safety concerns, as they have a higher potential for explosions. But th

sweet-ann [11.9K]

Everything explodes without it. One sentence :)
If this helped i'd like if you could sub to my YouTube channel;
https://www.youtube.com/watch?v=DLylSpbnKYg

8 0

4 years ago

A human bite that breaks the skin is considered a bloodborne pathogen exposure true or false

tia_tia [17]

TRUE
Human bites may transmit blood borne pathogens(BPS) by exposing the bitters oral mucosa to the bitee's blood and the bite wound to bitters saliva. Consequently bites may require post exposure follow up, since bitter's oral mucosa invariably gets exposed to bitee's blood(reverse exposure), all bitees should be tested for HCV-HIV infectivity.

4 0

3 years ago