Describe the intracellular events that occur when a population of wild type ( lac+) escherichia coliis transferred from a medium with glucose as the sole nutrient source to a medium with lactose as the sole nutrient source.
The lac repressor protein is bound to the operator region of the lac operon when there is no lactose in the medium. When introduced in lactose, it binds to an allosteric site on the repressor causing its to change conformation and release from the operator. This allows the polymerase that is bound to the promoter region to proceed transcription of the lac operon genes (LacZ, Lac A, and Lac Y). Translation of these genes forms enzymes that enable the organism to break down lactose for energy.
Menopause normally occurs between the ages of forty-five to fifty-five, but can be induced prematurely by which procedure?
Menopause normally occurs between the age groups of 45 to 55 years, but it can be induced prematurely by the procedure of surgical removal of ovaries.
What is Menopause?Menopause is the time in the lifecycle of a female which marks the end of the menstrual cycles and also reproduction. It is diagnosed after a person has undergone 12 months without a single menstrual period. Menopause can happen in the age of 40s or 50s, but the average age of menopause in the United States is found to be 51. Menopause is a biological process but it can be induced by several procedures.
Menopause that happens between the age of 41 and 45 years of age is called as the early menopause. In some cases, early or premature menopause is brought upon by the surgical removal of the ovaries, or by the medical treatments including radiation therapy and chemotherapy.
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Researchers tested the effects of acid rain on seedlings of two different species, camphor tree (cinnamomum camphora) and chinaberry tree (melia azederach). results of the experiments are shown here. note that acid rain caused a significant reduction of growth in chinaberry trees ( ∗∗∗ means p<0.001), but not in camphor trees. what was the approximate percentage of growth reduction observed in the chinaberry trees treated with acid rain?
A 40% reduction in height was observed.
Explanation:Researchers tested the effects of acid rain on seedlings of two different species, camphor tree (cinnamomum camphora) and chinaberry tree (melia azederach). acid rain caused a significant reduction of growth in chinaberry trees), but not in camphor trees.
40%-THE HEIGHT WITH DISTILLED WATER WAS 25, WHILE WITH A PH OF 2 IT WAS 15, THEREFORE A 40% REDUCTION IN HEIGHT WAS OBSERVED.
What physical feature serves as a "safety-valve" overflow basin for flooding?
Answer and Explanation:
The Tonle Sap lake serves as a "safety-valve" overflow basin for flooding. It is located in Camboya. Its extension varies according to the season. The lake might occupy 2500 km² during the dry season but can reach up to 16000 km² during the wet season.
The Tonle Sap lake is fed by numerous rivers from different latitudes and altitudes, and it is tributary of the Sap river that flows towards the southeast and joins the Mekong river, conforming together the Basac river.
The Tonle Sap river is reversible, also according to the season. When the Monzon rains enhance the Mekong river´s level, the curse of water of the Tonle Sap river inverts flowing towards back the northeast. The Tonle Sap river stops providing water to the Mekong and begins to provide water to the Tonle Sap Lake. This last one sharply elevates its level.
Once the wet season is over, the Tonle Sap river redirects its water back to its original direction.
The Tonle Sap lake acts as a regulator of the Mekong Lake´s course.
This lake is very rich in resources, especially fishes that live in these waters, and are the feeding source of most Vietnamese.
What is a the study of chemical reactions in living organisms called?
The process by which non-biodegradable pollutants become more concentrated near the top of a food chain is called _______.
Bioaccumulation is the process in which there is increase in the concentration of pollutants in an organism at the top of a food chain. Bioaccumulation occurs when non-biodegradable pollutants such as chemical enter into an organism and the organism is unable to break down or excrete the chemical. The chemical then continues to accumulate until it eventually becomes deadly to the living organism.
On which cell types do antibodies exist as transmembrane proteins?
Naïve B cell
Naïve B cell is known to be a B cell that is not exposed to an antigen. Thus, once naïve B cell is exposed to an antigen, it becomes a plasma cell or memory B cell that secretes antibodies specific to the antigen that was original bound.
a student is infected by a common cold virus ran a low-grade fever. After a few days, the students temperature returned to normal and the student was free of cold symptoms. the fever served as
He thymus gland is actually composed of lymphoid tissue and is located in the mediastinal cavity, in front of and above the _________.
The thymus gland, an essential part of the human immune system, is located in the mediastinal cavity, in front of and above the heart.
Explanation:The thymus gland is a vital part of the human immune system. The thymus gland, an essential part of the human immune system, is located in the mediastinal cavity, in front of and above the heart. Composed primarily of lymphoid tissue, it is located in the mediastinal cavity. When the question asks what is placed 'in front of and above', it is referring to the heart. This gland is responsible for the production of T-cells, which are fundamental for immune response.
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In which order do the necessary enzymes act to repair a thymine dimer by nucleotide excision repair?a) nuclease, dna polymerase, rna primaseb) helicase, dna polymerase, dna ligasec) dna ligase, nuclease, helicased) dna polymerase, rna polymerase, dna ligasee) nuclease, dna polymerase, dna liga?
The correct order of enzymes involved in nucleotide excision repair to repair a thymine dimer is: nuclease, DNA polymerase, and DNA ligase, which is in option e. So, option e is the correct answer.
Nucleotide excision repair is a crucial mechanism that cells employ to fix DNA damage, such as thymine dimers. When a thymine dimer occurs, it distorts the DNA structure and disrupts normal base pairing. To rectify this damage, a series of enzymes work together in a coordinated manner. The first step involves a nuclease enzyme that recognizes the thymine dimer and cuts out the damaged portion of DNA. This incision creates a gap in the DNA strand, removing the section that contains the dimer. So, option e is the correct answer.
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What feature does not apply to the nervous system in comparison to the endocrine system?
A medical assistant discovers an unidentifiable liquid on the floor of one of the clinic's treatment rooms. which of the rollowing materials should the assistant use to remove and dispose of the liquid
A clean-up kit
A clean-up kit is a set of equipment that is designed for cleaning purposes such as removal of dirts, stains, or impurities. A clean-up kit contains equipment such as gloves, absorbent pads, face shield, shoe covers, trash bags and disposable apron and gown which are required for cleaning. For the question given above, the assistant should use a clean up kit to remove and dispose the liquid.
A physics student takes her pulse and determines that her heart beats periodically 60 times in 60 seconds. the period of her heartbeat is
Answer:
1 second
Explanation:
During DNA replication, a primer attaches to a template strand of DNA and begins a new strand. After the primer has attached, an enzyme extends the new strand of DNA by adding nucleotides that correspond to the nucleotide sequences in the template strand.
Which enzyme is responsible for adding nucleotides to the growing DNA molecule?
ponsible for adding nucleotides to the growing DNA molecule?
A.
DNA helicase
B.
DNA isomerase
C.
DNA polymerase
D.
DNA structase
Answer:
DNA polymerase
Explanation:
Prior to cell division, the DNA of that cell must be replicated in order for each daughter cell to receive the correct amount of genetic material (DNA). This process of DNA replication occurs in the Synthesis phase of Interphase. Before DNA starts replicating, the double-stranded DNA is unwound by an enzyme called DNA HELICASE to form two separate single strands.
Each of these strands serves as a template for replicating a new strand. An enzyme called DNA primase catalyzes the attachment of short nuceleotide sequences called PRIMER to the template strand in order for DNA POLYMERASE to synthesis/add new nucleotides to the growing DNA.
DNA polymerase adds nucleotides that are complementary to the ones it reads on the template strand.
During DNA replication, the enzyme that is responsible for adding nucleotides to the growing DNA strand is DNA polymerase. This enzyme synthesizes new DNA strands according to the template DNA, ensuring the accurate reproduction of the genetic information.
Explanation:The enzyme responsible for adding nucleotides to the growing DNA molecule during DNA replication is DNA polymerase. DNA polymerase is a key component in the process of DNA replication, where it synthesizes new strands of DNA according to the template provided by the original, parental DNA strand. The enzyme's function is to add nucleotides that correspond to the nucleotide sequences in the template strand, thereby ensuring the accurate replication of the genetic information.
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The benefits of spines on a cactus are similar to the benefits of the ?.
Which action is a reflex action? asking for coffee in a cold climate blinking when light is flashed in the eyes drinking water when thirsty swallowing food taking an exam
The correct answer is blinking when light is flashed in the eyes
The blinking of eyes is considered as the reflex action because it is an involuntary closing of eyelids which is elicited by the stimulation of cornea. Any peripheral response can generate blinking of eyes. The purpose of this reflex action is to protect the eyes from foreign stimulus. When a light is flashed on the eyes it served as an external stimulus, as a result of this the eyes blinked to protect the eyes from bright light. It occurs in 0.1 seconds.
The process of forming a new species from an existing species is
Plasma membranes of adjacent cardiac muscle cells interlock at specialized regions called intercalated disks. what is the significance of this feature of cardiac muscles?
Intercalated disks in cardiac muscles are vital for heart function. They contain gap junctions that facilitate coordinated contraction and desmosomes that provide mechanical strength.
Explanation:The intercalated disks of cardiac muscles are crucial for the heart's functionality. These specialized regions where adjacent cardiac muscle cells interlock are packed with gap junctions and desmosomes. The gap junctions allow for the rapid spread of electric currents, enabling the heart to beat as a coordinated unit. This simultaneous contraction is essential for effective heart function. On the other hand, the desmosomes provide mechanical strength to the heart by holding cardiac muscle cells together during vigorous contraction.
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How often an allele occurs in the gene pool is _________ __________?
Which halogen is a fatal poisonous gas, but is put in drinking water and swimming pools to prevent serious diseases?
Which factors would explain this pattern among predator and prey populations in this area?
A- When the prey population decreases, there is less food for predators.
B- When the prey population increases, there is more food for predators.
C- When the prey population increases, there is less food for predators.
D- When the prey population decreases, there is more food for predators.
Both of tim's parents have brown eyes, but tim has blue eyes. how is this possible? choose the best answer.
Which symbol on a regulatory marker indicates hazards such as rocks or stumps? green square?
The symbol on a regulatory marker that indicates hazards such as rocks or stumps is an Orange Diamond. Regulatory markers are types of non-lateral markers such as white and orange markings that are used as navigation aids that give directions, warn of dangers and marks controlled locations. Orange diamond shapes warns of dangers such as rocks, stumps or construction.
People who cross over or occupy an intermediate position in the binary male-female gender construction are called transsexuals. intersexuals. transgenders. eunuchs. third genders.
How would you classify the relationship between the butterfly fish and the coral polyps?
During complex and demanding tasks, teens ________________. overload their frontal lobes overload their flocculonodular lobe distribute the workload evenly throughout the brain distribute the workload evenly between abducens nucleus and globose nucleus
Answer:
The correct answer is: overload their frontal lobes.
Explanation:
The frontal lobes are one of the four major brain lobes found in humans and are located at the front of each hemisphere. Frontal lobes are responsible for many important things, such as voluntary movement, numeracy skills, language and decision making.
The frontal lobes start developing in childhood and keep maturing until early adulthood. Their front part, the prefrontal cortex, is the latest to develop and is responsible for controlling impulses - which explains why kids and teenagers are much more impulsive than adults.
The flocculonodular lobe is in the cerebellum and is involved in moving the head and the eyes in order to maintain balance.
The abducens nucleus (located in the brain stem) coordinates the movements of the two eyes, and the globose nucleus (located in the cerebellum) coordinates the connection between the cerebellum and the rest of the central nervous system.
Oral contraception is not recommended for women with question 5 options:
a.a history of blood clots.
b.a low resting heart rate.
c.an intense exercise regimen.
d.a history of asthma.
Oral contraception is not recommended for women with a low resting heart rate. Thus, the correct option for this question is B.
What is oral contraception?Oral contraception may be characterized as a type of contraceptive method that is utilized in order to prevent the circumstance of pregnancy. This method includes various kinds of pills and other drugs for the successful prevention of pregnancy.
According to the context of this question, the combined oral contraceptive pill is often referred to as the birth control pill. These pills may contain hormones that block the release of eggs from the ovaries. Most oral contraceptives include estrogen and progesterone. This type of contraceptive method is not recommended for women with a low resting heart rate.
Therefore, the correct option for this question is B.
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Most often, antigens are composed of __________. view available hint(s) most often, antigens are composed of __________. polysaccharides lipids glycoproteins nucleic acids
If RNA extracted from a virus was injected into a host cell, the cell will not begin to make new viruses. TRUE FALSE
nevermind the answer is true
Answer:
False
Explanation:
The genetic material of a virus cannot replicate on its own , therefore it needs a host cell. Now, when the RNA of the virus is introduced into the host cell, the processes such as uncoating, replication, and assembly causes incorporation of genetic material of virus into the genetic material host cell, thereby causing replication of viral genome. Replication of viral genome is equivalent to formation of new viruses.
Hence, If RNA extracted from a virus was injected into a host cell, the cell will begin to make new viruses.
Therefore, the given statement is false
What part of the cell theory relates to cell division and ferilization?