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3 years ago

What is a buffer?

2 answers:

8 0

Buffers maintain a pretty stable pH level, resisting any large changes. When introduced to a base, it will act as an acid to counteract it, and vice versa.

vivado [14]3 years ago

6 0

Answer : The correct option is, a solution that can receive any amount of acid or base to form a neutral solution.

Explanation :

Buffer : It is defined as a solution which prevent the any changes in the pH on the addition of an acidic and basic components.

Or we can say that, buffer is a solution that maintain the pH of the solution by adding the small amount of acid or a base.

As we know that there are two types of buffer which are acidic buffer and basic buffer.

Acidic buffer : It is defined as the solution that have the pH less than 7 and it contains weak acid and its salt. For example : Acetic acid (weak acid) and sodium acetate (salt).

Basic buffer : It is defined as the solution that have the pH more than 7 and it contains weak base and its salt. For example : Ammonia (weak base) and ammonium chloride (salt).

Hence, the correct option is, a solution that can receive any amount of acid or base to form a neutral solution.

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Mutations rII1 and rII2 are known to fall into the rIIA and rIIB cistrons (genes) respectively. Cells of E. coli B are infected

viktelen [127]

Answer:

the answer is A. E. coli B

Explanation:

The multiplicity of infection (MOI) refers to the ratio between the numbers of viruses used to infect <em>E. coli</em> cells and the numbers of these <em>E. coli </em>cells. Benzer carried out several experiments in order to define the gene in regard to function. Benzer observed that <em>E. coli </em>strains with point mutations could be classified into two (2) complementary classes regarding coinfection using the restrictive strain as the host. With regard to his experiments, Benzer observed that rII1 and rII2 mutants (rapid lysis mutants) are complementary when they produce progeny after coinfect E. coli K (where neither mutant can lyse the host by itself). The rII group of mutants studied by Benzer does not produce plaques on <em>E. coli</em> K strains that carry phage λ (lysogenic for λ), but they produce plaques on <em>E. coli</em> B strains. This study showed that rIIA and rIIB are different genes and/or cistrons in the rII region.

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3 years ago

A cell spends the majority of it's life in Interphase. Pick one of the parts of Interphase below, and explain why that portion i

Sedaia [141]

S Phase it is important that the cell develops properly

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3 years ago

Can someone please HELP?

serious [3.7K]

Answer:

<h3>MAP OF THE PHILIPPINES</h3>

Explanation:

<h3>#BRAINLIESTBUNCH</h3>

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2 years ago

Girdling a tree involves cutting a deep groove all the way around a tree trunk; it would have the effect of:

wlad13 [49]

Answer:d. interrupting the passage of phloem sap and killing the tree.

Explanation:plants contains vascular bundles for conducting water and salt and dissolved food , throughout the plant.the vascular bundles; xylem and phloem are located close to the bark of the tree.

Girdling a tree involves cutting a deep groove all the way around a tree trunk.this is done to kill the tree.the phloem is removed along with the back of the tree.the xylem might remain intact.the phloem functions primarily to move food materials from one part of the tree to another.when it is removed,food materials produced in the leaves cannot get to the root.

After a while ,the root dies and so does the tree

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4 years ago

A. E. coli is able to use foods other than glucose in the absence of available glucose, because falling levels of glucose cause

Gnom [1K]

Answer: D) cAMP

Explanation:

In the absence of glucose cell can make use of other sources of carbohydrates such as lactose. In E. Coli and other bacteria utilization of lactose depends on the availability of cAMP. Bacteria accumulate cAMP only when starved. When glucose is exhausted, cAMP is available in plenty.

cAMP is necessary for the gene expression because it binds catabolite repressor protein (CAP) to form CAP-cAMP complex. CAP is a lac repressor the binds to the operator site of the lac operon preventing RNAP From binding to the promoter.

RNA polymerase can bind to the promoter site only when CAP-cAMP formed

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3 years ago