1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Natalija [7]
3 years ago
12

What prevents the lac genes in the DNA of E. colin from being expressed most of the time ?

Biology
1 answer:
Alona [7]3 years ago
3 0
The lac repressor prevents the lac genes in the DNA of E. coli from being expressed most of the time. The answer to your question is A. I hope this is the answer that you are looking for and it comes to your help.
You might be interested in
What pair of molecules both contain carbon atoms
gtnhenbr [62]

Answer:fats and proteins water and carbohydrates nucleic acids and water oxygen gas and fats Fats and proteins both contain carbon atoms. s

Explanation:

5 0
3 years ago
Approximately what percentage of the human genome is composed of repetitive sequences?
Arturiano [62]
Approximately 50% of human genome is composed of repetitive sequences. It contains approximately 3 billion of these base pairs that reside with 23 pairs of chromosome within the nucleus or our cells or called nucleotides. Genes in the genomes of invertebrates such as Drosophila is not like the human genes because the human genes contain more and larger introns than the genes in the genomes. The human genes are larger than the genes in the genomes. The genome sequence is ~99.9% similar in individuals of all nationalities. Complete set of deoxyribonucleic acid of a single cell of an organism or sequence for humans (Homo sapiens) is called Genome. It includes both protein-coding deoxyribonucleic acid genes and noncoding deoxyribonucleic acid. 
4 0
3 years ago
In one generation, the frequency of the A allele is 70 percent and the frequency of the a allele is 30 percent. What are the cha
Fynjy0 [20]
The answer is 9%.

To calculate this we will use some <span>formulas of the Hardy-Weinberg principle:
</span><span>p² + 2pq + q² = 1 and <span>p + q = 1
where:
</span></span>

<span>p - the frequency of the A allele.
q - the frequency of the a allele.</span>

p² - the frequency of dominant homozygote (with AA genotype)

2pq - the frequency of heterozygote (with Aa genotype)

<span>q² - the frequency of recessive homozygote (with aa genotype)</span>

<span>We know:</span>

p = 70% = 70/100 = 0.7

q = 30% = 30/100 = 0.3

We need to calculate the frequency of the genotype aa:

q² = ?

Since we know the frequency of allele q, it is easy to calculate the frequency of the genotype aa:

q² = 0.3² = 0.09 = 0.09 · 100% = 9%

6 0
3 years ago
A squirrel population lives in an area. Over many years, a river in that area grows wider and stronger, eventually forming a can
Natasha2012 [34]

Answer:

The correct answer is D. allopatric speciation

Explanation:

5 0
3 years ago
The flooding from hurricane Katrina destroyed or badly damaged some of the ecosystems of southern Mississippi. What type of ecol
Ksivusya [100]

Answer:

Secondary Succession.

Explanation:

I think the answer is Secondary Succession because the damage was caused by a natural disaster.  Secondary Succession is the recolonizing of living things after a disturbance. In this case the hurricane was the disturbance.

8 0
2 years ago
Other questions:
  • Two protein kinases, K1 and K2, function sequentially in an intracellular signaling pathway. If either kinase contains a mutatio
    10·1 answer
  • Help asap Which of the following is a decomposer?
    14·2 answers
  • But what would he not be able to build<br> ?
    10·1 answer
  • Explain the limiting factors that control population growth
    14·1 answer
  • What is the term used to populations moving into a area?
    12·1 answer
  • An organism that is multicellular, heterotrophic, has cell walls, and is unable to move independently would be classified into t
    6·1 answer
  • Cómo podría tu familia y tú manifestar su participación democrática en la sociedad y el
    6·1 answer
  • In pea plants, flowers are either white or purple: the purple color is produced by pigments called anthocyanins. The production
    10·1 answer
  • Anyone use zoom<br>code:- 2574030731<br>pass:- HELLO<br>Z●●M​
    11·1 answer
  • What a section of DNA on a chromosome that has genetic information for one trait.
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!