Binding of the lac repressor protein to the lac operator is regulated allosterically. This means that the presence of a specific small molecule that binds to the lac repressor controls whether the repressor can bind to the lac operator, and therefore whether the operon is turned on or off. Can you sort the following conditions based on whether they are associated with the lac operon being turned ON or turned OFF?
a. Allolactose is absent
b. Allolactose is present
c. RNA polymerase cannot transcribe the operan genes
d. The lac repressor protein cannot bind to the lac operator
Answer:
a. OFF
b. ON
c. OFF
d. ON
Explanation:
Allosteric regulation is a process by which a particular molecule activates or inhibits an enzyme, by binding to a site different from the active site of the enzyme. Allolactose is a disaccharide that binds to the allosteric site of the lac repressor protein, triggering a conformational change in the protein that prevents the binding of this repressor to DNA. Moreover, RNA polymerase (RNA pol) is an enzyme required for the process of transcription, and therefore when this enzyme cannot bind to operon genes the lac operon is being turned OFF. Finally, the lac operator is a nucleotide sequence where RNA pol binds, and the lac repressor binds to the lac operator in order to block the transcription of the lac operon.
Diagrams 1 and 2 show cells from an organism with a diploid chromosome number of 4.
> >
x x
1
2
Refer to the illustration above. Which of the cells will be a diploid cell at the completion
of division?
Both the cells will be diploid cells at the completion of division. Therefore, the correct option is B.
In diagram 1, the chromosomes are in the metaphase of cell division, that is aligned at the centre of the cell. In the next phase which is anaphase, these chromosomes are pulled apart by the spindle fibres in opposite directions. As a result, the chromosomes are split into half and each cell gets half the number of chromosomes in the form of chromatids. Thus, each cell will have 4 chromatids.
In diagram 2, the chromosomes are in the early anaphase stage. When the cell will split into two, each daughter cell will have 2 chromosomes. These chromosomes separate in the telophase and thus, each cell will have 4 chromatids.
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What are the roles of a decomposer? Check all that apply.
1) Decomposers kill harmful microorganisms.
2) Decomposers break down waste and dead organisms.
3) Decomposers provide oxygen to the atmosphere.
4) Decomposers convert sunlight into food energy.
5) Decomposers recycle nutrients in the environment.
Answer:
2) Decomposers break down waste and dead organisms.
Explanation:
I hope this helps :)
Answer:
2 and 5
Explanation:
Select 2 choices
1-The blood entering the lung is colored bright red.
2-The blood leaving the lung iscolored bright red.
3-The body takes in oxygen and releases carbon dioxide.
4-Oxygen gas is mainly transported via the red blood cell's hemoglobin.
5-The blood leaving the lung is richer in carbon dioxide than the blood entering the lung.
6-Carbon dioxide is mainly transported via the red blood cell's hemoglobin.
Answer and I will give you brainiliest
1 and 5, Solvent, and yh I am not sure but I think so
Which of the following was NOT one of Darwin's
arguments for his theory of natural selection?
A) There is variation among individuals in a
population
B) Much variation is heritable
C) Populations possess an enormous reproductive
potential
D) Resources are abundant
E) Population sizes remain stable
Answer:
option D) resources are abundant.
Explanation:
according to Darwin resources are small. individuals of a population compete for these resources.
Summarize the water cycle
Answer:
The water cycle describes how water evaporates from the surface of the earth, rises into the atmosphere, cools and condenses into rain or snow in clouds, and falls again to the surface as precipitation. ... The cycling of water in and out of the atmosphere is a significant aspect of the weather patterns on Earth.
In a biological reaction involving an enzyme, what does the active site of an enzyme bind to?
A. the inactive site of another enzyme
B. the catalyst
C. the active site of another enzyme
D. the substrate
Answer:substrate
Explanation: The enzyme 's active site binds to the substrate. Increasing the temperature generally increases the rate of a reaction, but dramatic changes in temperature and pH can denature an enzyme, thereby abolishing its action as a catalyst.
Answer:
The Substrate.
Explanation:
The enzyme 's active site binds to the substrate. Increasing the temperature generally increases the rate of a reaction, but dramatic changes in temperature and pH can denature an enzyme, thereby abolishing its action as a catalyst.
https://courses.lumenlearning.com/boundless-biology/chapter/enzymes/#:~:text=The%20enzyme%20's%20active%20site,its%20action%20as%20a%20catalyst.
Plus I took the test on k12.
The ____ principle of decision support system takes into account time and space factors when a farmer makes a decision.
Answer:
Explanation:
Fertilization decision support system.
PLS HELP
Place the following images in the chronological order that represents the process of pollination.
Question 4 options:
2, 3, 1, 4
3, 2, 4, 1
1, 2, 3, 4
2, 3, 4, 1
Answer:
1 4 2 3 sorry if i am wrong i hope it is wright
Which is a possible outcome for future generations of farmers if the same crop is planted on the same patch of land every year?
the soil could become infertile due to the lack of time for nutrients to be reinserted
the crops could become resistant to pests and insects through natural selection
the soil could become drought resistant due to the shallow root structure that would form
the crops could begin to change their genetic makeup due to mutations from the parent plants
Answer:
A
Explanation:
I hope this helps :)
The soil could become infertile due to the lack of time for nutrients to be reinserted. So, the correct option is (A).
What is Soil?Soil is also defined as earth or dirt which is a mixture of organic matter, minerals, gases, liquids and organisms which together support life. These are distinguished from silt by restricting the former term specifically to displaced soil.
It provides many important services for both people and the planet by putting food on our plates, purifying our water, protecting us from floods and combating drought. Soil is also important in combating climate change because it captures and stores large amounts of carbon. Without healthy soil there is no food security.
Whereas growing the same crop year after year reduces the availability of certain nutrients and depletes the soil. Monoculture leads to soil exhaustion when the soil becomes deficient in these nutrients.
Thus, the soil could become infertile due to the lack of time for nutrients to be reinserted. So, the correct option is (A).
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please help! I will give brainly! x
Why was 1990 an important year regarding air quality?
The United States took first steps to keep the air clean.
The United States created the Environmental Protection Agency.
Modifications and improvements were made to the Clean Air Act.
Funding was established under the Clean Air Act to study air pollution.
Answer:
C. Modifications and improvements were made to the clean Air Act.
Explanation:
Btw I answered first
Identify the correct sequence of molecules, as a gene goes from coded information in the nucleus, to the product the cell wants to make.
A. DNA to mRNA to tRNA to Protein
B. DNA to tRNA to mRNA to Protein
C. DNA to tRNA to Protein to mRNA
D. Protein to mRNA to tRNA to DNA
Answer:
your answer is A
Explanation:
DNA -> messenger (M) RNA -> transfer (T) RNA -> to protein.
Cork cambium is the protective tissue of a stem. What mechanism does it use to protect the stem? HINT: It's not A.
A. Deposits of water in the cork cambium act as a barrier and protect the stem from water loss, physical damage, and invasion of pathogens.
B. Deposits of minerals in the cork cambium act as a barrier and protect the stem from water loss, physical damage, and invasion of pathogens.
C. Deposits of oils or waxes in the cork cambium act as a barrier and protect the stem from water loss, physical damage, and invasion of pathogens.
Answer:
The answer should be C. The cambium produces a waxy substance called suberin which repels water so..
Answer:
B. DEPOSITS OF MINERALS IN THE CORK CAMBIUM ACT AS A BURRIER AND PROTECT THE STEM FROM WATER LOSS, PHYSICAL DAMAGE, AND INVASION OF PATHOGENS..
Explanation:
A & C is wrong! just took the test and got it wrong. neither one is right. THE ANSWER IS B.
what are formed through long periods of chemical weathering and erosion by water.
Answer:
Sometimes, chemical weathering dissolves large portions of limestone or other rock on the surface of the Earth to form a landscape called karst. In these areas, the surface rock is pockmarked with holes, sinkholes, and caves. The water transforms anhydrite into gypsum, one of the most common minerals on Earth.
Explanation:
I'm sorry if this isn't the answer you are looking for :(
1) Discuss two neurotransmitters and their functions? 2) The central nervous system is comprised of what two structures? 3) What is the purpose of the autonomic nervous system? 4) What brain system is involved with memory and emotions? 5) What purpose do convolutions, folds, and fissures (on the brain surface)serve in relation to brain functions 6) What is the purpose of the endocrine system? 7) What is the purpose of Myelin in the nervous system. 8) BONUS (EXTRA CREDIT POINTS)- IN RELATION TO NEUROTRANSMITTERS, WHY DO SOME PEOPLE SAY LAUGHTER IS THE BEST MEDICINE? 2 points
Answer:
1. dopamine and serotonin
2. brain and spinal cord
3. controls the function of different processes in the body
4. limbic system
5. Increase brain surface area
6. release hormones into the bloodstream
7. insulation
8. laughing has multiple positive functions in the body
Explanation:
Dopamine is a neurotransmitter (i.e., a chemical messenger) involved in responses to rewards, motivation and memory, while serotonin is another neurotransmitter that controls appetite, mood, wakefulness and sleep onset. The central nervous system (CNS) consists of the brain and spinal cord. The spinal cord acts as a conduit by which messages are sent from the brain to the body and from the body to the brain. Moreover, the brain acts to control all body abilities (e.g., thinking, talk, feeling, walking, breathing, etc). The autonomic nervous system is known to modulate different processes (e.g., blood pressure, digestion, breath) and internal organs (e.g., heart) by acting largely unconsciously, i.e., without a person's conscious effort. The limbic system is a part of the brain that acts to control emotions and memory by modulating autonomic/endocrine functions. Convolutions, folds, and fissures can increase brain surface area, thereby more neurons are packed into the cortex of the brain and thus it is possible to process more information. The endocrine system acts to release hormones into the bloodstream. These hormones travel in the blood to their target cells/tissues, where they regulate different functions (e.g., mood, growth, development, metabolism, reproduction, etc). The myelin is an insulating layer surrounding nerve cells that enables electrical impulses to transmit efficiently around the whole body. Laughing has multiple positive functions: release endorphin hormones that decrease stress, increases the number of immune cells and antibodies, stimulate the activity of internal organs (e.g., heart), quickly relax the muscles, contribute to increase the oxygen uptake rate in blood, etc.
Two students gather information on the global effects of plastic found in ocean waters. Student A collected information from three peer-reviewed scientific journals on the internet while student B collected information from a local newspaper.
Which statement best describes the reliability of the students' research?
A
Student A's research is more reliable because it was gathered from peer-reviewed journals.
(Choice B)
B
Student B's research is more reliable because it came from a single source.
(Choice C)
C
Student B's research is more reliable because newspapers can only publish current research.
(Choice D)
D
Student A's research is more reliable because it came from the internet.
Answer:Student A’s research is more reliable because it was gathered from peer-reviewed journals.
Explanation:
In any experiment, reliabilty and validity is very important. The best statement that best describes the reliability of the students' research is that Student A's research is more reliable because it was gathered from peer-reviewed journals.
Reliability is simply known as an individual obtaining the same answer through the use an instrument to measure something more than once.It is the degree to which research method gives stable and consistent results.
Reliability often deals with consistency of a measure. Ita types are test-retest reliability, internal consistency, and inter-rater reliability.
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Phosphate is present in
A. DNA
B. RNA
C. Both DNA and RNA
D. Neither
Answer:
c)both DNA and RNA
explanation
When it is attached to a molecule containing carbon, it is called a phosphate group. It is found in the genetic material DNA and RNA, and is also in molecules such as adenosine triphosphate (ATP) that provide energy to cells. Phosphates can form phospholipids, which make up the cell membrane.
RNA has a different nitrogenous base. This" different" base pairs with Adenine meaning RNA base pairs are represented (A-U & C-G). What is the name of the nitrogenous base only found in RNA
A. Thymine
B. Uracil
C. Cytosine
Animals cells use a process called___ in order to convert ____ and _____ into ____ and ___. This process mainly occurs in the ______ of the cell
Answer:
Animal cells use a process called cellular respiration in order to convert oxygen and glucose into carbon dioxide and water (and also ATP). This process mainly occurs in the mitochondria of the cell
Explanation:
Please me help ASAP.
Answer: the second answer
Explanation:
Skeletal support in sponges may be provided by a. spicules of calcium carbonate. c. spongin fibers. b. spicules of silica. d. All of the above
What is one of the causes of mechanical weathering?
A. acid rain
B. oodation
C. animal actions
D. carbon dioxide
Answer:
answer is A hope it helps if it dont what can i help you with later.
Explanation:
The bark of a tree trunk includes which of the following tissues?
A. primary and secondary phloem
B. Heartwood and phloem
C. Heartwood and sapwood
D. Secondary phloem and layers of periderm
Which one of these is not a human effect on the water cycle?
Developed areas prevent soil from absorbing rainwater
Precipitation is increasing in deserts due to an increase in water use
Air pollutants also wash back into the land and water bodies from precipitation
Storm water runoff carries pollution
Answer:
Precipitation is increasing in deserts due to an increase in water use
Explanation:
Just see for yourself
The one that is not a human effect on the water cycle is precipitation is increasing in deserts due to an increase in water use. The correct option is B.
What is the water cycle?The continual movement of water on, above, and below the Earth's surface is referred to as the water cycle, also known as the hydrologic cycle or the hydrological cycle.
One of the most essential elements of human life is water. There is water all over. It passes through your house as well as rivers, mountains, lakes, and oceans. Without water, neither humans nor any other species could survive.
In the majority of deserts, the air's moisture content is very low. In the dry air, light raindrops frequently evaporate before they can reach the ground. Rainstorms can occasionally appear as ferocious cloudbursts.
Therefore, the correct option is B. Precipitation is increasing in deserts due to an increase in water use.
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Volcanoes are part of which sphere of Earth?
a. biosphere
b. geosphere
c. hydrosphere
d. atmosphere
Which statement describes how organelles aid in transporting proteins in eukaryotic cells?
A. Mitochondria transport ribosomes to the endoplasmic reticulum.
B. Lysosomes attach free-floating amino acids to mRNA molecules.
C. The Golgi apparatus joins free-floating phosphates to ADP molecules.
D. Membrane-enclosed proteins leave the ER and merge with the Golgi apparatus for further processing.
What is Adhesion
A. The ability of molecules to stick to molecules that are the same
B. The ability of molecules to stick to any molecules
C. The ability of molecules to not be able to stick to any molecules
D. The ability of molecules to stick to different molecules
Answer:
D. The ability of molecules to stick to different molecules
Explanation:
Plants that are common to the temperate midlatitudes could also thrive in the tropics if they were grown at higher elevations. The effects of altitudinal zonation on plants and animals are unique to Latin America. Altitudinal zonation has had a strong influence on the types of native plants and animals found in the Andes and other mountainous regions. Only a few zones of the mountains may be used for some agricultural purpose. Altitudinal zonation makes it possible to grow many different types of crops.
Answer:
Due to different climatic condition.
Explanation:
Altitudinal zonation makes possible to grow many different types of crops because of different climatic condition of the region. Each and every plant has different climatic and environmental requirements due to which different plants can be grown on different places where environment is suitable. Some plants needs cool environment so they can be grown on high altitude while some needs warm temperature which can be grown on lower altitudes near the equator.
An exotic species is the same as an invasive species.
True
False
Answer:
False
Explanation:
Exotic species are species brought to and unfamiliar environment, just like invasive species. There is a difference between the two however. Exotic species are indeed not native to their environment, but unlike invasive species, they are not harmful to the ecosystem. In order for an exotic species to become invasive, it must out-compete native organisms for food and therefore cause harm to the ecosystem. Non-native species that do not out-compete species remain exotic and not a high risk of disrupting the ecosystem.
Hope this helps!
Please answer fast!
What are the two arteries where you can check your
pulse?
A. brachial and dorsalis
B. facial and femoral
C. carotid and radial
D. temporal and auricular
Answer:
c
Explanation:
Because the Carotid is your wrist and Radial is your neck
