All categories

2 years ago

a bacterium has a faulty lac operon in which there is a structural defect in the operator. in this bacterium:

1 answer:

4 0

A bacterium has a faulty lac operon in which there is a structural defect in the operator. In this bacterium there is a structural problem with a segment of DNA that binds a repressor.

A protein known as a repressor binds to an operator site. The operator in this instance (and numerous others) is a section of DNA that lies just downstream of the RNA polymerase binding site or overlaps with it (promoter). In other words, it lies between the operon's promoter and its genes.

The repressor protein inhibits the synthesis of messenger RNA by attaching to the promoter region of the gene(s) (mRNA). The control of gene expression in cells requires repressor proteins.

Thus, by physically impeding the RNA polymerase's ability to operate, these repressor proteins stop the gene from being transcribed.

To learn more about DNA.

brainly.com/question/316480

#SPJ4

You might be interested in

In terms of weather, what kind of boundary does the line labeled X represent?

jeyben [28]

I think it would be cold front ^^, I hope it helps!

5 0

3 years ago

What characteristics do the members of the four kingdoms of the four domain Eukarya have in common?

nikdorinn [45]

They all have a nucleus and membrane-bound organelles.
They can all be multi cellular.

(That's all I can think of :/ sorry for the lack of characteristics)

3 0

3 years ago

The dna polymerase extends the primers into a new dna strand by.

Yuki888 [10]

Answer:

adding nucleotides one by one

Explanation:

A typical primer is about five to ten nucleotides long. The primer primes DNA synthesis, i.e., gets it started. Once the RNA primer is in place, DNA polymerase "extends" it, adding nucleotides one by one to make a new DNA strand that's complementary to the template strand.

8 0

2 years ago

If an animal cell has excess energy, what is most likely to happen to this energy?

Len [333]

I think the correct answer from the choices listed above is the last option. If an animal cell has excess energy, most likely it will be stored as fat molecules. <span>Anabolic process is done to synthesize Triglycerides (Fat) to store for a rainy day. Hope this answers the question. Have a nice day.</span>

6 0

3 years ago

Read 2 more answers

In rabbits, short hair is due to a dominant allele, S, and long hair to its recessive allele, s. Black hair is due to a dominant

Natali5045456 [20]

Answer:

SsBB x SsBB

SsBB x SsBb

Explanation:

SS- short hair

ss - long hair

BB- black hair

bb- white hair

Total the number of offspring produced = 2518+817=3335

Where 2518= short haired, black offspring SSBB or SsBb

817= Longed Hair, black offspring ssBB or ssBb

To get the offspring proportion for short hair black offspring

2518/3335×100 = 75.5%

long-haired, blackoffspring =817/3335×100 = 25%

This gives ratio of 3:1 as against the proposed dihybrid phenotypic ratio of Mendel experiment 9:3:3:1

Now, if you remember a dihybrid cross results in 9:3:3:1 phentoype ratio. That is when both parents are heterozygous for both alleles. So we can rule that out since it doesn't match our 3:1 ratio.

Since all the offspring are black , it means one parent is homozygous dominant for black and the other parent is either homozygous or heterozygous for the black allele.

Since the ratio is 3:1, for the hair length

That leaves us with the short hair. Since the ratio is 3:1, both parents are heterozygous for hair length.

Therefore, the possible parental genotype is

SsBB x SsBB

SsBB x SsBb

4 0

3 years ago