Tryptophan is an amino acid necessary for
e. coli survival and growth.
e. coli contain genes coding for enzymes that synthesize tryptophan. these genes are grouped together on a segment of dna called the tryptophan (trp) operon. cells can use these enzymes to synthesize tryptophan when it is not present in the environment. however, when tryptophan is already present in the environment, cellular resources are shifted away from manufacturing the enzymes for tryptophan synthesis. tryptophan binds with and activates the trp repressor, which then binds to the trp promoter and blocks rna polymerase. blocking rna polymerase decreases the normal transcription rate of the operon. what type of regulation does the trp operon exhibit?

Answers

Answer 1
Regulation of protein synthesis at the transcriptional level, since the question clearly states that the binding of the activated repressor to the operator (not promotor) prevents the binding of RNA polymerase to operator. RNA polymerase is used in transcription.

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Related Questions

Benzodiazepines work best as a treatment for anxiety when __________.
a. the physician is perceived by the patient as being warm
b. the physician has a positive attitude toward antianxiety drugs
c. the physician believes that the patient will improve
d. all of the above

Answers

The correct answer is:  [D]:  "all of the above" .
__________________________________________________

"a lake is one example of local base level.
a. true
b. false"

Answers

the answer is true hope this helps

You are performing chemical tests on a sample of fatty acid. you find that you cannot hydrogenate the sample, leading you to suspect that it is

Answers

You are performing chemical tests on a sample of fatty acid. you find that you cannot hydrogenate the sample, leading you to suspect that it is saturated. 

The American Psychological Association is the only organization that can approve psychological research studies. Please select the best answer from the choices provided T F

Answers

The statement "The American Psychological Association is the only organization that can approve psychological research studies." is false.

Although the organization is one of the premiere psychology association in the United States, wherein it is an institution that represents the psychologists in the US, it is not only the organization that approves researches relating to psychology.

It is incorrect to state that the American Psychological Association is the sole agency that can endorse psychological research studies.

What is psychology?

The scientific study of the behavior and mental processes is known as psychology. Psychologists work hard to learn about and fully comprehend mental states, brain structures, and behavior patterns.

Psychologists undertake basic and research activities, consult with groups and organizations, treat and diagnose patients, and educate future psychologists and those interested in other fields.

They assess intelligence as well as personality. Many psychologists work in the medical field.

Although the agency is one of the prestigious psychology associations in the United States, and it is an organization that reflects psychologists in the United States, it is not the only organization that approves psychology research."

Thus, the given statement is false.

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how long would it take the sound to get from the calling monkey to another monkey if the monkeys were 2 km apart?
Howler Monkeys

Answers

To solve the question we proceed as follows;
time=distance/speed
distance between the monkeys is 2km=2000m
But the speed of sound= 330 m/s
Therefore the time taken for a howler monkey to get to the other will be:
time=2000/330=6.1 seconds
The answer is 6.1 seconds

It would take less than 5.8 seconds for the sound to travel from the calling monkey to another monkey 2 kilometers apart, based on the speed of sound at sea level

kilometers apart, we can use the speed of sound in air. The speed of sound is approximately 343 meters per second at sea level and at 20°C (68°F). To find the time, we divide the distance by the speed of sound:

Time (seconds) = Distance (meters) / Speeof sound (meters/second)

Since 2 kilometers is 2000 meters, we have:

Time = 2000 meters / 343 meters/second

Time \< 5.8 seconds

Therefore, it would take less than 5.8 seconds for the calling monkey's roar to reach another monkey if they were 2 kilometers apart in conditions similar to sea level at 20°C.

What are the disadvantages of a flatworms digestive system having only one opening?

Answers

The main disadvantage of a digestive system like this is that there is only one opening where the food enters and leaves. Therefore the organism, in our case,  the flatworm, must wait for the food to be digested and excreted through the opening in order to be able to eat again.
I  think the answer is that they cannot eat continuously. Due to the fact that flat worms have on opening, they will have to excrete using the same hole they eat from. This digestive system is common in simplest invertebrates in a gastrovascular cavity. It is also called an incomplete digestive system.

Why is it important for action potentials to only be conducted in one direction? why is it important for action potentials to only be conducted in one direction?
a. the brief refractory period prevents reopening of voltage-gated na+ channels.
b. if the signal were transmitted in both directions, it would not be as efficient at transmitting information to the brain.
c. voltage-gated channels for both na+ and k+ open in only one direction.
d. the axon hillock has a higher membrane potential than the terminals of the axon?

Answers

Think of it like an electric circuit. If electricity was going in both directions, what would happen? It wouldn't work. Answer is B

Final answer:

Action potentials must be conducted in one direction to ensure efficient transmission of signals along neurons, enforced by the mechanism of the absolute refractory period that follows voltage-gated Na+ channel inactivation.

Explanation:

It is important for action potentials to only be conducted in one direction because once the voltage-gated Na+ channels open and Na+ enters the cell during depolarization, the channels become inactivated at the peak of depolarization and initiate a brief period called the absolute refractory period. During this time, the channels cannot reopen, preventing the depolarization from spreading back toward the previously opened channels.

Following depolarization, K+ channels open allowing potassium to exit the cell, facilitating repolarization. Along the axon, depolarization moves like a wave towards the axon terminals, unable to reverse direction due to the refractory period. If action potentials were able to travel in both directions, it would disrupt the signal transmission efficiency and the overall polarity of the neuronal signal.

what system allows the fungus to break down it's food

Answers

Hyphae which makes mycelium I guess.
all I know is that hyphae produces some chemicals that breaks the materials in soil into simpler materials then it absorbs it to feed on.

What safety precautions should one take when using chlorinated solvents for extraction?

Answers

the lab should be well ventilated, there should be no flames and gloves should be worn.

The correct answer is that the lab should be well ventilated, there should be no flames and wear gloves.


When using chlorinated solvents for extractions the precautions should take is that, the lab should be well ventilated, there should be no flames and a person should wear gloves.


Chlorinated solvent is a large family of chemical compounds that contains chlorine. Examples are trichloroethylene and carbon tetrachloride.


Chlorinated solvents are used for wide variety of industrial and commercial it includes decreasers, cleaning solution, pesticides, resins, glues and thinners.

Chlorinated solvents leaves the body through urination and exhalation.

It can lead to long-term or short-term.

Which of the following is NOT true of viruses? A. They usually infect specific types of cells. B. They're nonliving particles. C. They reproduce on their own without hosts. D. They're able to crystallize.

Answers

Hi. Viruses can only replicate through the infection of a host cell. Because of this, they are unable to survive and reproduce on their own without hosts. The other options in the question are all true except for option C.

ANSWER: C. They reproduce on their own without hosts.
C. They reproduce on their own without hosts.

The range or area occupied by a population is called,

Answers

geographic distribution

Which level of organization in the classification system is directly above the class level?
Domain
Family
Kingdom
Phylum

Answers

Answer:

Phylum

Explanation:

In the biological classification system, categories are used to group organisms according to their similarities. The basic category is species, which is defined as similar beings who are able to reproduce naturally and generate fertile descendants.

Animals of the same species are grouped into another category, the genus. All who belong to the same genre are grouped into families, which are grouped into orders, which in turn come together in classes, assembled in phyla, and finally we have the kingdoms. Kingdoms are therefore the last category in the hierarchy and subdivided into the most basic category. So we have:

Kingdom ⇒ Phylum ⇒ Class ⇒ Order ⇒ Family ⇒ Gender ⇒ Species

From this we can conclude that the level of organization in the classification system that is directly above the level of "class" is the "phylum".

Answer: Kingdom

Explanation: In this system of classification, kingdom is always ranked the highest followed by division, class, order, family, genus, and species.

and i got it right on my test

Which of these is a renewable building material?

A) Limestone
B) Granite
C) Wood
D) Steel

Answers

Wood____________________________________

Answer: Wood

Explanation: The substances can be regrown or reused again after using it for the first time is known as renewable resources.

Here, the wood is obtained from the trees and trees can be considered as the source of renewable resources.

It can be grown again and again and woods from the trees can be used for various processes.

between which two letters does differentiation occur?

Answers

Differentiation occurs between two letters in the context of calculus. It refers to the process of finding a derivative, which represents the rate of change of a function with respect to a variable.

true or false eukaryotes are much smaller than prokaryotes

Answers

The answer is false If it was true it would say, Prokayotes are is smaller than a eukaryotes.

what is typical of cell reproduction when normal cells are reproduced in a Petri dish from a tissue culture? check all that apply
1.cells reproduce only when there is room in the Petri dish
2.cells reproduce one layer thick and then stop reproducing
3.cells undergo unlimited reproduction by mitosis
4.when a cell dies or is damaged, a new one is created to fill the empty spot

Answers

Cells reproduce only when there is room in the petri dish. Cells reproduce one layer thick and then stop reproducing.
When a cell dies or is damaged, a new one is created to fill the empty spot.

Bone with insufficient or abnormal collagen would _____ compared with healthy bone. (select all that apply.)

Answers

The bone with insufficient or abnormal collagen would fracture easily compared with a healthy bone. Collagen is the most abundant protein in our bodies , and is found in muscles, bones, skin , blood vessels, digestive system and tendons. Collagen provides integrity, firmness and elasticity to their structures, such as bones. Therefore a healthy bone has high integrity and firmness and thus can resist fractures and other mechanical damages.

Answer:

Bone with insufficient collagen has a grater chance to get fractured compared to a healthy bone.

Explanation:

Collagen is one of the most abundant fibrous protein in human body. It is made by the connective tissue cells. It forms scaffold which provides strength to the bones. Its also present in skin, muscles ad tendons. Insufficient or abnormal collagen leads to Osteogenesis imperfecta. It is a condition where bones become brittle.

which of the cell's organelles releases energy stored in food?

A.mitochondria
B.chloroplasts
C.lysosomes
D.endoplasmic reticulum

Answers

I want to say A. but go listen to the cells rap to find out hope i helped plz give me brainliest answer

Mitochondria releases energy stored in food. Correct option is A.

Mitochondria are the cell's organelles responsible for releasing energy stored in food. They are often referred to as the "powerhouses" of the cell. Through a process called cellular respiration, mitochondria convert nutrients from food, such as glucose, into usable energy in the form of adenosine triphosphate (ATP). This energy is essential for various cellular activities and functions. Mitochondria are found in most eukaryotic cells, including animal and plant cells.

The primary function of mitochondria is to generate energy in the form of ATP through a process called cellular respiration. This process involves breaking down organic molecules, such as glucose, obtained from food to release energy. Mitochondria act as the site for several interconnected reactions that occur in different stages: glycolysis, the citric acid cycle (also known as the Krebs cycle), and the electron transport chain.

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Which pathway would be used during a one minute, steep climb?

Answers

Answer:

Anaerobic Respiration

Explanation:

Just took the test.

Answer:

Anaerobic Respiration

Explanation:

got right on edge

Which agent of erosion carried sediment that scratched bedrock

Answers

The agent of erosion, which carried sediments that scratched bedrock is A MOVING GLACIER.
Agents of erosion refers to those forces that cause erosion. There are basically four agents of erosion, these are wind, running water, glaciers and gravity.
Glaciers are large sheet or block of ice that move along a landscape. Glaciers are powerful agents of erosion; moving glaciers are capable of removing loose rocks on their way of movement. They can also pick up and move particles of varying size. Moving glaciers usually carry sediments which scratch  and polish bedrocks surfaces.

Impermeable surfaces increase water runoff that may cause flooding.
a. true
b. false

Answers

I think it was true answer
That is true. Impermeable surfaces increase water runoff that may cause flooding.

Plants respond to various sources of stimuli such as sunlight, water, and gravity. Plants in humid climates sometimes bend their roots toward a higher humidity. What is this response known as? A. geotropism B. gravitropism C. hydrotropism

Answers

Tropism is defined as the propensity of a plant to direct itself away (negative tropism)  or towards (positive tropism) the stimuli. Plants that bend their roots towards a more humid environment exhibits positive hydrotropism as humidity is related to the water content of the environment.

Gravitropism and geotropism have the same definition wherein plants move towards or away from gravity.
The answer for the question is hydrotropism. Tropism is the directional growth of an organism, typically a plant, in response to an external stimulus, such as light or gravity. Growth towards the stimulus is called the positive tropism, while the growth away from the stimulus is referred to as negative tropism. In this case; hydrotropism is a type of tropism where plants bend their roots towards the source of stimuli, that is water or moisture. The importance of this tropism is to seek more water for use by the plants.

A primigravida client with severe gestational hypertension is admitted to the labor unit. she has been receiving magnesium sulfate iv for 3 hours. the latest data reveals deep tendon reflexes (dtrs) of +1, blood pressure of 150/100 mm hg, a pulse of 92 beats/minute, a respiratory rate of 10 breaths/minute, and urine output of 20 ml/ hour. which action would be most appropriate?

Answers

Magnesium sulfate is a drug for preeclampsia. This drug can be dangerous as it could cause respiratory paralysis. In this case, the patient shows several symptoms of magnesium sulfate toxicity such as reduced respiratory rate(10 breaths/minute), decreased tendon reflex(deep tendon reflexes of +1) and decreased urine output(20 ml/ hour).

The action that needs to be done in magnesium sulfate toxicity is stopping magnesium infusion and prepare for the antidote, calcium gluconate.

Answer:

Stop the magnesium sulfate infusion.

Explanation:

The patient shown above shows magnesium sulfate toxicity so infusion of this element should be discontinued. In addition, magnesium sulfate should not be used in patients with the physical conditions shown in the above question such as poor and insufficient respiratory rate, urinary output and weak and minute reflexes.

Magnesium sulphate is indicated for replacement of magnesium levels in the treatment of hypomagnesemia, cerebral edema, eclampsia, seizure control in acute uremia, uterine tetany, control of cardiac arrhythmias and barium poisoning, but should be discontinued when patient shows signs of toxicity or exhibits the symptoms shown above.

In which if the following would the cell cycle be shortest

Adult brain cell
Embryonic cell
Teenagers kidney cell
Unfertilised egg cell

Answers

Hi!

The answer is an Embryonic cell.

Hope this helps!

-Payshence xoxo

meiosis is the process in which

Answers

Meiosis is a form of reproduction in which two parent cells are needed. Also known as Sexual Reproduction. organs related to this are male and female reproduction organs. In each cell from different sex, there are 23 chromosomes. When creating an offspring the 23 chromosomes from each come together to create a 43 chromosome cell.

What's a fossil that's formed when an outline of the original organism is formed from left-over carbon?

Answers

Hi!

The answer is "Carbon films"

Hope this helps!

-Payshence xoxo

This is an organ of the central nervous system, which has three distinct parts that control and coordinate the activities of the body. The cerebrum controls thoughts, voluntary actions, and the sensations related to the five senses. The cerebellum helps with balance and coordination. The stem controls vital and involuntary processes like breathing and your heart beating.

Answers

Brain. This organ serves as the center of the central nervous system. It exerts control over the other organs in the body.  It acts on other orgasn both by controlling muscle activity and secretions of hormones. The response of brain primarily depends on the stimuli from the environment.The interior of the brain whem viewed will show gray matter and white matter. Brain operations is now usderstood however, the way they cooperate is still not fully understood. Function controlled by brain are perception, motor control, arousal, homeostasis, motivation, learning and memory.

Answer: It's the Brain

Which process is the one in which glucose is oxidized to generate two molecules of pyruvate and in which atp and nadh are produced?

Answers

it is Glycolysis.
a word from (Glyco from glucose), (lysis from breaking)

Glycolysis is the one in which glucose is oxidized to generate two molecules of pyruvate and in which atp and nadh are produced.

What is glycolysis?

Glycolysis is the metabolic pathway that converts glucose into pyruvate. The free energy released in this process is used to form the high-energy molecules adenosine triphosphate and reduced nicotinamide adenine dinucleotide.

Glycolysis is a cytoplasmic pathway which breaks down glucose into two three-carbon compounds and generates energy. Glucose is trapped by phosphorylation, with the help of the enzyme hexokinase.

Glycolysis is the first step in the breakdown of glucose to extract energy for cellular metabolism. Glycolysis consists of an energy-requiring phase followed by an energy-releasing phase.

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The mitral valve is in between which two chambers of the heart?

Answers

lit is located between the left ventricle and left atrium.

Left atrium is known to be one of the four chambers of heart that receives oxygenated blood from the right and left pulmonary veins. This blood is pumps to the left ventricle through the mitral valve. However, left ventricle is responsible for pushing oxygenated blood through the aorta to the rest of the body.


Psychologists are supposed to make the most ethical decision they can in any circumstance. Please select the best answer from the choices provided T F

Answers

I think that this is true, but also that this is true not only for psychologists, but for people in general - we should be taking the most ethical decision in any circumstance. However, this might be problematic, as people disagree about what is ethical - still, considering ethics in decision-taking is a good way of maximizing people's benefit and making sure we are not hurting anyone

So the statement is true. 

I would say that however, psychologists have even more responsibility to make ethical   decisions because they are specifically trained to do so.

The statement "Psychologists are supposed to make the most ethical decision they can in any circumstance." is true.

Who are psychologists?

Psychologist is a person who deal with problems related to the mind, thinking, emotional and social condition of a person. They are considered doctors of psychology.

They can understand the problem by hearing the problems of the patient, and they also prescribed medicine to calm them and given them emotional support.

The main part of their job is to collect information based on the behavior and interviews of the patient and also study the function of brain. They also suggest things to do to maintain the lifestyle.

Thus, the statement is true.

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