Theo mô hình Operon Lac, vì sao protein ức chế mất tác dụng

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Answer 1
What uhhh yeah that’s a good question I g

Related Questions


Black fur (B) is dominant to white fur. Soft fur (S) is dominant to rough fur. What is probability that the
offspring will have white color and rough fur?

Answers

Answer:

A) 1/16

Explanation:

Because both white fur and rough fur are recessive traits, you need all genes shown to also be recessive. If a single trait is dominant, then it will be expressed instead of a recessive gene. Because there is only one square out of sixteen that is all lowercase, the chance of having both recessive traits (White fur and Rough fur) is 1/16.

It’s sad when you realize you aren’t as important to someone as you thought you were.​

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that is quite unfortunate for u

Dr. Schweitzer found structures identical to modern red blood cells and blood vessels inside the bone. Which organ system do blood cells and blood vessels belong to? A. circulatory system B. nervous system C. respiratory system D. skeletal system ​

Answers

Answer:

A. Circulatory system

Explanation:

Circulatory system consist of heart,blood cells&blood vessels

which organelle do you think is the most important ? make a scientific argument by explaining what makes the organelle you chose more important than all the other organelles

Answers

Answer:

The nucleus

Explanation:

This organelle gives all the info. Without it, the cell will die. It's like a human is alive without a brain.

This is the equation for the thermite reaction:
Fe2O3 + 2Al = Al2O3 + 2Fe

You know the charge on the Al and O ions because you know how many electrons each atoms "wants" to give or take by looking at their position on the periodic table (and because it was listed on the cards). Fe is element 26, iron, in the middle of the periodic table. Since it forms Fe2
2
O3
3
, what charge does the Fe ion have?

Answers

The charge of Fe in Fe₂O₃ is +3.

Let's consider the equation for the thermite reaction:

Fe₂O₃ + 2 Al ⇒ Al₂O₃ + 2 Fe

One of the reactants is ferric oxide, we can calculate the charge of Fe in Fe₂O₃ considering that:

The sum of the charges of the atoms is equal to the charge of the compound.The charge of a neutral compound is 0.The charge of O in oxides is -2.

The charge of Fe in Fe₂O₃ is:

[tex]2Fe+3O = 0\\2Fe+3(-2)= 0\\Fe=+3[/tex]

The charge of Fe in Fe₂O₃ is +3.

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which of the following statements is NOT part of the cell therory

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Answer:

it is accepted that cells contain DNA in chromosomes and RNA in the nucleus and cytoplasm, but only in the modern cell theory. the classical cell theory does not include this. but using either classical or modern theory, it is false that all cells have DNA surrounded by a nucleus.

Explanation:

Hope this helps.

Write the number of each atom in the chemical formulas for all of the possible combinations of positive and negative ions found on the cards. You can use the cards to figure out the formula by making as many copies of the cards as necessary to get them to line up exactly equally.

Example:

Na__Cl___

The chemical formula is NaCl, so you would place a 1 in the box for both Na and Cl.

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A chemical formula is obtained from the number of atoms in a compound.

Chemical compounds are composed of atoms. The number atoms of each element in a compound determines the correct formula of the compound. Before I can write the chemical formula of any compound, I must first determine the number of each atom in the compound.

For instance, phosphorus trichloride contains one atom of phosphorus and three atoms of chlorine hence I would place a 1 in the box for P and 3 in the box for Cl.

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Give me info about plants and animals that live in coral reefs

Please explain in 3-4 sentences.

Thank you

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Answer:

small plants ad animals tend to habit coral reefs because the sharp coral protects the animals from sharks and other predators. It also works as a ecosystem because every animal works together to provide for each other. I can t your anymore but that is the main idea of what coral does. if you can see if you can reword it into more sentences. How this helps!

Which description best represents the organelle; Nucleus

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What are the descriptions

The sweetness of the cookies changes in every run of the experiment. What type of variable is the change in sweetness?​

Answers

Answer:

It's an independent variable

Explanation:

Because The independent variable is the variable the experimenter manipulates or changes, and is assumed to have a direct effect on the dependent variable.

One of the roles of ecological succession is to encourage biodiversity in a habitat. Ecological succession occurs in stages and permits a habitat to allow new species to grow in number as the habitat A)is destroyed B)remains the same C)undergoes change D)is relocated

Answers

C as the habitat undergoes changes is ur answer

Ecological succession occurs in stages and permits a habitat to allow new species to grow in number as the habitat undergoes change. Thus C is the correct option.

What is ecological succession?

Ecological succession is defined as the process through which the mix of species and habitat in an area changes over time.  Gradually these communities replace one another until a climax community like a mature forest is reached, or until a disturbance, like a fire, occurs.

There are two major types of ecological succession namely primary succession and secondary succession. Primary succession occurs when a new patch of land is formed or exposed for the first time.

Secondary succession occurs when a climax community or intermediate community is impacted by a disturbance.

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What would most likely be the effect if an experimental design specifies only an experimental group?
1. The experiment will lack a control.
2. The experiment will lack a purpose.
3. The experiment will not be repeatable.
4. The experiment will not have variables.

Answers

I think it’s 4. But not sure.

Which type of isolation is being described: Yellow butterflies breed during the summer season while red butterflies breed during the winter season, because of this, they cannot interbreed

temporal isolation

geographic isolation

behavioral isolation

Answers

By stating that "Yellow butterflies breed during the summer season while red butterflies breed during the winter season" we are referencing a form of temporal isolation.

Temporal isolation is one of the limiting factors for sexual reproduction between closely related species. Temporal isolation refers to the situation in which two closely related species cannot interact sexually with one another due to the timing of their respective mating events.

The question states that the yellow butterflies will breed during the summer season, whilst the red butterflies breed during the winter. Normally, species like this are closely related enough to allow interspecies breeding to take place and create a new species or simply diversify the existing ones. However, due to the distinct timing of the breeding cycles for each butterfly, they will not be able to breed with one another, which is a prime example of temporal isolation.

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1. Migration that can bring new allcles into a population.

A. natural selection

B. mutation

C. genetic drift

D. gene flow

E. sexual selection

2. Chance and random events that can reduce the variation in small population.

A. natural selection

B. mutation

C. genetic drift

D. gene flow

E. sexual selection

3. Individuals with inherited characteristics that allow them to best compete for limited resources will survive and have more offspring than those individuals with variations that are less able to compete. Because characteristics are inherited, these traits will be better represented in the next generation.

A. natural selection

B. mutation

C. genetic drift

D. gene flow

E. sexual selection

4. Leads to traits that may not be well suited to the environment but increase fitness.

A. natural selection

B. mutation

C. genetic drift

D. gene flow

E. sexual selection

5. Ultimate source of brand new alleles in a population.

A. natural selection

B. mutation

C. genetic drift

D. gene flow

E. sexual selection

Answers

Answer:

1. D (In population genetics, gene flow is the transfer of genetic material from one population to another.)

2. C (Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation. It can also cause initially rare alleles to become much more frequent and even fixed. When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is smaller.).

3. A  and also E (Individuals with inherited characteristics that allow them to best compete for limited resources will survive and have more offspring than those individuals with variations that are less able to compete. Because characteristics are inherited, these traits will be better represented in the next generation.)

4. D (Gene flow can increase fitness but if it happens in another environment, it decreases the adaptability. If alleles are advantageous, the offsprings' inheritance increases.

5. B (Mutations are the main source of alleles)

What is the endosymbiotic hypothesis?

Answers

Answer:According to the Endosymbiotic Theory, the mitochondria and chloroplast in eukaryotic cells were originally aerobic bacteria (prokaryotes) that were consumed by a huge anaerobic bacterium (prokaryote).

Symbiogenesis, endosymbiotic theory, or serial endosymbiotic theory, is the leading evolutionary theory of the origin of eukaryotic cells from prokaryotic organisms

Vitamins are created during:

A. Photosynthesis
B. Peroxidation
C. Combustion
D. All the above

Answers

I believe it’s A.
If I’m wrong I’m sorry I think that’s what they said in school

5514998054 ps:- 123456​

Answers

Where’s the question.??????

What is ocean sequestration?

Answers

Answer:

it is the process by which carbon dioxide is removed from the atmosphere, is achieved through various chemical and biological processes

What is the process by which food is broken down to release energy?

Answers

Answer:

Respiration

Respiration:- It is the process by which food (glucose) is broken down in the cells of the body with the help of oxygen to release energy. Since respiration takes place in the cells of the body, it is called cellular respiration.

Explanation:

have a beautiful day ahead

Answer:

Explanation:

Answer is : respiration

Why do you think leewenhoek was excited about what he saw

Answers

Answer:

what kind of quastion is this

Explanation:

HELP NEED ANSWER IN AT LEAST 5 MINUTES will mark brainliest A single cell can be an organism. O True O False​

Answers

Answer: Yes

Explanation: All organism need energy to survive and carry out basic life functions. Mitochondria in these cells utilize ATP (which are energy molecules) to perform these functions. Even one cell can do this. ... These are all types of cell division that help categorize single-celled organisms as living organisms.

Type of molecule ,been having a hard time figuring it out

Answers

I don’t really know but i’m pretty sure a Nucleic Acid if you’re learning about macromolecules

Answer: Cyclic adenosine monophosphate

Explanation:

What happened to the color of peppered moths after govermental regulations were put in place to decrease air pollution?


A. moths that were lighter in color became more fit over time


B. moths became lighter during their lifetime and passed on the alleles for lighter color to their offspring

C. moths became darker during their lifetime and passed on the alleles for darker color to their offspring

D. moths that were darker in color became more fit over time​

Answers

Answer:

A

Explanation:

While B seems to be correct, it is A because evoulution requires time and a moth would not have undergone such dramatic phenotypic change in its lifetime.

What is hypothesis in paramecium homeostasis

Answers

Answer: osmosis

Explanation: water moves into the organism by osmosis  and pumped out by the contractile vacuole . the concentration of solutes in the water will determine the rate of contractions in paramecium

а
What behavior does a fly
body
to escape
use
from
predators

Answers

Answer:

Quick getaway is the answer but I'm not too sure

List ten structure you coul find in an electron micro graphy of an animal cell would be absent from the cell of bacteria

Answers

Answer:

Bacteria (prokaryotic) do. not have membranes bound organelles.

therefore it doesn't have nucleus (hasa nuclied instead).no mitrochondira. no gogli appraratus,no

endoplasmic reticulum.

Explanation:

up is the explanation.

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how are active faults and inactive faults similar

Answers

Active faults are structure along which we expect displacement to occur. By definition, since a shallow earthquake is a process that produces displacement across a fault, all shallow earthquakes occur on active faults. Inactive faults are structures that we can identify, but which do no have earthquakes.

Answer:

Active faults are structure along which we expect displacement to occur. By definition, since a shallow earthquake is a process that produces displacement across a fault, all shallow earthquakes occur on active faults. Inactive faults are structures that we can identify, but which do no have earthquakes.

Explanation:

Which of the following is a correct difference between RNA and DNA?

1. RNA is single stranded and DNA is double stranded
2. RNA is double stranded and DNA is single stranded
3. DNA uses Uracil and RNA uses Thymine
4. RNA has deoxyribose and DNA has ribose

Answers

Answer:

Chupapi munyano

Explanation:

Answer:

The answer is A. RNA is single stranded and DNA is double stranded

Hope this helps!!

What is fulgurite? ? ?????????????

Answers

Answer:

Fulgurites, commonly known as "fossilized lightning", are natural tubes, clumps, or masses of sintered, vitrified, and/or fused soil, sand, rock, organic debris and other sediments that sometimes form when lightning discharges into ground.

What are the possible genotypes and phenotypes of the offspring: both parents have achondroplasia (they are heterozygous) and are carriers for diastrophic dysplasia? In what ratios of the phenotypes?

Answers

Answer: njnjnjnjinjinjnjinjinjnjnjnjnjnj

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