The Lac Operon is a set of genes that controls the production of lactase the enzyme that digests
lactose. In the top picture: The gene is "turned off" resulting in no mRNA being made. In the
bottom picture: The gene is "turned on" allowing the RNA polymerase express the genes,
resulting in production of the lactase enzyme.
which statement is not correct about the lac operon?
Answers
Answer:
The lactose present prevents the production of lactase
Explanation:
This question is describing a set of genes in bacteria called LAC OPERON. Lac operon controls the production of lactase, which is the enzyme that digests lactose. However, this gene can be regulated at the transcription level i.e caused to be transcribed or not depending on certain factors.
According to the question, lac operon, which regulates the production of enzymes will be transcribed and subsequently translated i.e. turned on when there is a substrate (lactose) that the produced enzyme will work on. However, when there is no need of the lactase enzyme or there is absence of lactose (substrate), the lac operon gene is turned off.
Note that, the statement that "The presence of lactose prevents the production of lactase" is not correct.
Related Questions
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Online Content: Site 1
Explain the effects of air pollution on several European countries. (Site 1)
Answers
Answer:
Air pollution harms human health and the environment. In Europe, emissions of many air pollutants have decreased substantially over the past decades, resulting in improved air quality across the region. However, air pollutant concentrations are still too high, and air quality problems persist. A significant proportion of Europe’s population live in areas, especially cities, where exceedances of air quality standards occur: ozone, nitrogen dioxide and particulate matter (PM) pollution pose serious health risks. Several countries have exceeded one or more of their 2010 emission limits for four important air pollutants. Reducing air pollution therefore remains important.
Air pollution is a local, pan-European and hemispheric issue. Air pollutants released in one country may be transported in the atmosphere, contributing to or resulting in poor air quality elsewhere.
Particulate matter, nitrogen dioxide and ground-level ozone, are now generally recognised as the three pollutants that most significantly affect human health. Long-term and peak exposures to these pollutants range in severity of impact, from impairing the respiratory system to premature death. Around 90 % of city dwellers in Europe are exposed to pollutants at concentrations higher than the air quality levels deemed harmful to health. For example, fine particulate matter (PM2.5) in air has been estimated to reduce life expectancy in the EU by more than eight months. Benzo(a)pyrene is a carcinogenic pollutant of increasing concern, with concentrations being above the threshold set to protect human health in several urban areas, especially in central and eastern Europe.
"Air pollution is causing damage to human health and ecosystems. Large parts of the population do not live in a healthy environment, according to current standards. To get on to a sustainable path, Europe will have to be ambitious and go beyond current legislation."
Explanation:
If a cell has 14 chromosomes, how many chromosomes will each daughter cell have after mitosis and cytokinesis?
Why is this important?
Answers
Answer: After mitiosis, each daughter cell will also have 12 chromosomes. Cytokinesis is just the last stage of telophase, where the cell completely forms the two daughter cells. Telophase does not form chromosomes.
Explanation:
If a cell has 14 chromosomes, there are 14 chromosomes in each daughter cell.
What happens in Mitosis?There are four stages of mitosis: prophase, metaphase, anaphase and telophase.
1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres.
2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell)
3) Anaphase: sister chromatids are pulled to opposite poles of the cell
4) Telophase: nuclear envelope reforms, chromosomes unfold into chromatin, cytokinesis can begin.
If a cell has 14 chromosomes, there are 14 chromosomes in each daughter cell.
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what would happen if the igneous rock was first exposed to energy from the sun
Answers
Answer:
If there is too much heat or pressure, the rock will melt and become magma. This will result in the formation of an igneous rock, not a metamorphic rock. Consider how granite changes form. Granite is an igneous rock that forms when magma cools relatively slowly underground
Explanation:
Answer:
An igneous rock can change under pressure to metamorphic. A igneous rock can turn into another igneous rock by melting and solidifying, it can turn into a sedimentary rock by getting weathered then recemented, or it can turn into a metamorphic rock by being subjected to great heat and pressure
Explanation:
Describe how carbon is cycled through the environment in the carbon cycle. Include an explanation
of how photosynthesis, cellular respiration, and carbon dioxide are involved in the carbon cycle.
Answers
Answer:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.
What phases are different from Mitosis during Meiosis?
please help i will mark brainliest
Answers
Answer:prophase
Explanation:
describe how you could determine the population size of a specific type of plant in a large forest without counting all of the plants
Answers
Answer:
The study of living and nonliving components of a system can be best described as an. ecosystem ... Describe how you could determine the population size of a specific type of plant in a large forest without counting all of the plants
It is possible to determine the population size of a specific plant in a forest by counting the number of the specific plant in a small section of the forest and then multiply this by the total area.
This technique is known as quadrat sampling.
Quadrat sampling is a methodology by which organisms of a sample of the habitat are directly counted and then this value is used to calculate the total population of an area, i.e., the total number of individuals/organisms in a given area.
In this case, a quadrat delimits a small area in which the specific plant can be estimated.
The abundance of a population in a particular area can be estimated by using the number found per quadrat and then multiply this value by the total size of the area.
Quadrat sampling is a very useful methodology for the study of biodiversity.
In conclusion, it is possible to determine the population size of a specific plant in a forest by counting the number of the specific plant in a small section of the forest and then multiply this by the total area.
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Select the tubes that contain protein.
Select all that apply.
Tube 1: Pepsin
Tube 2: Albumin
Tube 3: Starch
Tube 4: Water
Answers
Answer:
Tube 1: Pepsin
Tube 2:Albumin
Explanation:
The tubes that contain protein are TUBE 1 : PEPSIN and TUBE 2 : ALBUMIN
Pepsin contains inactive protein called Zymogen also called pepsinogen.
Albumin is the single most abundant protein which is produced in the liver.
Starch does not contain protein but sugar which yields Carbonhydrate.
Tube 4 : contains water which is also a form of nutrient different from protein.
Therefore, the tubes that contain protein ARE tube 1 and tube 2 : PEPSIN and ALBUMIN.
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what is the average density of the earths crust
Answers
Answer:
i hope it helps :)
Explanation:
2.6 grams per cubic centimeter
Which of the following correctly contrasts artificial and natural selection?
A Humans select traits to be inherited in artificial selection, while natural forces select traits to be inherited in natural selection
B. Artificial selection does not include the inheritance of traits, while natural selection requires the inheritance of traits
OC. In natural selection only physical traits are inherited, while in artificial selection only behavioral traits are inherited
O D. Natural selection only occurs after sexual reproduction, while artificial selection only occurs after asexual reproduction
Answers
Answer: A. Humans select traits to be inherited in artificial selection, while natural forces select traits to be inherited in natural selection.
Explanation: Good luck! :D
Answer:
A.
Explanation:
I just finished this quiz
What happens during the 4 stages of mitosis
Answers
Answer:
Mitosis consists of four basic phases: prophase, metaphase, anaphase, and telophase. Some textbooks list five, breaking prophase into an early phase (called prophase) and a late phase (called prometaphase).
1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres 2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell) 3) Anaphase: sister chromatids are pulled to opposite poles of the cell 4) Telophase: nuclear envelope ...
Explanation:
Brainliest plz trying to level up
What is an antigen?
Answers
Answer:
In immunology, an antigen is a molecule or molecular structure, such as may be present on the outside of a pathogen, that can be bound by an antigen-specific antibody or B-cell antigen receptor. The presence of antigens in the body normally triggers an immune response.
Where on earth did life first begin?
Answers
Answer:
As of 2017, microfossils (fossilised microorganisms) within hydrothermal-vent precipitates dated 3.77 to 4.28 Gya in rocks in Quebec may harbour the oldest record of life on Earth, suggesting life started soon after ocean formation 4.4 Gya during the Hadean Eon.
Explanation:
brainliest plsssssssss
Seals have long (F) fins - dominant - or short (f) fins - recessive. What is
the percent chance that an offspring would have short fins from the cross
of two heterozygous long-finned seals? *
Answers
Eggs and sperm are called gametes. What problem would result if gametes were diploid?
Answers
Answer: If gametes were produced instead by mitosis each gamete would be diploid not haploid. During fertilization of diploid gametes, the zygote would become 4n=92. With each new generation the number of chromosomes would double.
Explanation:
Answer:
If gametes were diploid, the resulting organism would have too many chromosomes.
Explanation:
Hope this helps
Name the three types of population distribution,
describe each, and explain the conditions that
govern each.
Answers
Answer:
random clumped uniform i think
Explanation:
Answer:
The three types of population distribution are uniform, random, and clumped.
Uniform distribution is rare. Individuals are evenly spaced and there is fierce competition for resources.
In random distribution, some individuals are close together, and some are spread apart. This occurs when there are sufficient resources available.
In clumped distribution individuals are clustered around patchy resources. This is the most common type of distribution.
Explanation: EDGE 2021
Which labeled structure would be the most likely site in which these malfunctioning proteins exist?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
Structure A
(Choice B)
B
Structure B
(Choice C)
C
Structure C
(Choice D)
D
None of these labeled structures would be the site of the malfunctioning proteins.
Answers
Explanation:
you answer is D none of these labeled structures would be the side of the malfunctioning proteins
Answer:
Its A
Explanation:
5 points
2. Describe the offspring made from sexual reproduction *
The offspring will be like the dad.
The offspring is a combination of both parents
The offspring are exactly like one of the parents
The offspring are not like either of their parents. They got their DNA from someone
else.
Answers
Answer:
The answer is the Second one. The offspring is a combination of both parents
Explanation:
Since both the parents genes and traits are mixed.
PLZ HELP WILL GIVE BRAINLIEST 35 POINTS
The cambium is a section of cells in a plant that can become either part of the xylem or phloem, depending on the growth and needs of the plant. If the cambium of a plant was damaged, what would be the most likely effect on the plant?
The plant would lose its ability to carry out photosynthesis.
the plant would have uncontrolled growth.
The plant would not experience any change in physiology.
The plant would not be able to transport nutrients and water.
Answers
Answer:
the plant would not be able to carry out photosynthesis
Explanation:
what is natural selection
Answers
Answer:
the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
Explanation:
Help please, I couldn't find the instruction for this, and my teacher said skip it, so I dont know the answer for it ._.
Answers
Answer: 1.rod, coccus, or spiral 2. peptidoglycan 3. flagella.
Explanation:
what happans to DNA inside the necleus before meiosis begins?
Answers
Answer:
Before mitosis begins, the cell has already made new copies of each of its chromosomes. However, these new copies remain attached to the original chromosome. A dividing cell must be able to pull the copied chromosomes apart from the original copies, which is how the DNA is evenly divided when one cell splits into two.
Explanation:
I looked it up
help please! i'm not entirely bad at biology but things like this i don't know lol
Answers
Explanation:kurapika
Why are two types of seismometers generally used to record the same earthquake?
Answers
Answer:
Because earthquakes produce two kinds of waves which travel through the earth in different ways and the combined information helps locate the earthquakes and give information about the structure of the earth
Explanation:
Help plz :)
Darwin's finches from his studies on the Galapagos Islands are some of the most
famous examples of evolution in action. Which of the following best explains why
these finches have beaks of different sizes and shapes?
A Comparative Biology
B Biogeography
C Embryology
D Fossil Record
Answers
Answer:
B Biogeography
Explanation:
Biogeography is the geographical distribution of organisms. The finches have different beaks because they are on different islands/geological areas.
write down the hormone secreted by gonads with one function
help me please
Answers
2. What is the role of wax impressions, and/or plaster casts, of teeth in forensic odontology
Answers
Answer:
to help mold or move the teeth
Explanation:
when you put a piece of wax on a pencil it miles to what the pencil shape is so the impression is either a vaneer or just mold of your teeth
.True or False: Clear-cutting results in mostly even-aged stands of trees
Answers
Answer:
my guess is
Explanation:
true
true
true
3. How many times is the magnification increased when you change from the low power lens to
the high power lens?
Answers
Identify Organelles in an Animal Cell
Answers
Answer:
A- Nucleus
B- Lysosome
C- Ribosomes
D - Centrioles
Explanation:
Got it right on edge2021
The cell organelles in an animal cell are Label A: Nucleus, Label B: Lysosome Label C: Ribosomes, and Label D: Centrioles.
Digestive enzymes found in lysosomes break down waste products from cells as well as foreign objects. They are essential for the recycling of cellular parts and preserving cellular homeostasis.
Ribosomes can be found either bound to the endoplasmic reticulum or floating freely in the cytoplasm. They interpret the messenger RNA (mRNA)-encoded genetic instructions and produce proteins in accordance.
Centrioles are essential for the development of the mitotic spindle, which helps separate the chromosomes during cell division.
Additionally, they play a role in the development of cilia and flagella, which are critical for some cell types' ability to move and perform sensory tasks.
Thus, the answers are nucleus, lysosome, ribosome, and centriole respectively.
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why is the percentage of food eaten a good thing to use
Answers
Answer:
Good nutrition is important throughout your life! It can help you feel in your best condition and stay strong. It can help reduce the risk of some of the common illnesses among older adults.