Answer and explanation:
The operator is a DNA fragment localized between the promoter and structural gene sequences that are able to repress operon transcription. A repressor is a molecule that binds to the operator to inhibit transcription, while an inducer is a molecule that activates transcription by binding either to the repressors or to the activators. A corepressor is a molecule that binds to repressors in order to activate them. A promoter is a DNA sequence localized upstream structural genes which binds to a transcription factor in order to activate operon transcription. Positive regulation is the process by which operon transcription acts as a positive loop, thereby increasing its own transcription, while negative regulation is the process by which operon transcription inhibits its own expression. Allostery refers to the process by which a molecule regulates operon transcription by binding to distal (and therefore non-functional) sites of the operon. Attenuation is a process able to reduce operon transcription and also to block subsequent translation.
_____ is work done to keep equipment in good working order.
This question is incomplete; here is the complete question:
_____ is work done to keep equipment in good working order.
A. Defragmentation
B. Preventive maintenance
C. Virus protection
D. A maintenance schedule
The correct answer is B. Preventive maintenance
Explanation:
Maintenance refers to the processes done on machinery or equipment to preserve its proper functioning. Moreover, this maintenance is preventive if it is done to prevent equipment from breaking down or having any malfunctioning. Besides this, preventive maintenance is globally recommended because in this way equipment used at home or in business works properly. According to this, the correct answer is preventive maintenance.
Which element provides strength to the exoskeletons of clams and oysters?
sulfur
oxygen
hydrogen
phosphorus
Phosphorus provides strength to the exoskeletons of clams and oysters. Thus, the correct option is D.
The exoskeleton of organisms including clams and oysters is made up of primarily calcium in the form of calcium phosphate and calcium carbonate.
Calcium phosphate is also present in the form of hydroxyapatite which is Ca₁₀(PO₄)₆(OH)₂ which provides invariable strength to the exoskeletal structure.
Thus, as phosphorus is a part of the exoskeleton, the correct option is D.
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Which statement explains how a DNA mutation causes sickle-cell anemia? (point)
The DNA mutation increases the number of amino acids in hemoglobin, which causes a change in the shape of red blood cells.
The DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape of red blood cells.
The DNA mutation decreases the number of amino acids in hemoglobin, which causes a change in the shape of red blood cells.
O The DNA mutation prevents formation of hemoglobin, the absence of wirich causes a change in the shape of red blood cells.
Answer:
The DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape of red blood cells.
Explanation:
Sickle cell anemia is one of a group of disorders known as sickle cell disease. Sickle cell anemia is an inherited red blood cell disorder in which there aren't enough healthy red blood cells to carry oxygen throughout your body.
Normally, the flexible, round red blood cells move easily through blood vessels. In sickle cell anemia, the red blood are shaped like sickles or crescent moons. These rigid, sticky cells can get stuck in small blood vessels, which can slow or block blood flow and oxygen to parts of the body.
Sickle cell anemia is caused by a mutation in the gene that tells your body to make the iron-rich compound that makes blood red and enables red blood cells to carry oxygen from your lungs throughout your body (hemoglobin). In sickle cell anemia, the abnormal hemoglobin causes red blood cells to become rigid, sticky and misshapen.
The sickle cell mutation reflects a single change in the amino acid building blocks of the oxygen-transport protein, hemoglobin. This protein, which is the component that gives red cells their color, has two subunits. The alpha subunit is normal in people with sickle cell disease. The beta subunit has the amino acid valine at position 6 instead of the glutamic acid that is normally present. The alteration is the basis of all the problems that occur in people with sickle cell disease.
The DNA mutation causes a change in the amino acid sequence for hemoglobin, which causes a change in the shape of red blood cells.
What is mutation?A mutation is an alteration in the nucleic acid sequence of the genome of an organism, virus, or extrachromosomal DNA. Viral genomes contain either DNA or RNA.
Moreover, a mutation is a change in the DNA sequence of an organism. Mutations can result from errors in DNA replication during cell division, exposure to mutagens or a viral infection.
Therefore, when a gene mutation occurs, the nucleotides are in the wrong order which means the coded instructions are wrong and faulty proteins are made or control switches are changed. The body can't function as it should. Mutations can be inherited from one or both parents.
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1. What is enzyme lactase used for, and what in what condition is lactase not available?
2. Which are supposed to be healthier for humans to consume, saturated fats or unsaturated fats? Hypothesize what the types of bonds in the fats might have to do with this.
3. For each compound below, list the molecular formula and name the elements present.
A) adenosine triphosphate (ATP)
B) glucose
C) urea
D) penicillin
E) cholesterol
F) testosterone
G) phenylalanine
Thanks!
1)This product is an enzyme supplement used to help people who have trouble digesting milk and other dairy products (lactose intolerance). Lactose is a type of sugar found in milk products. Lactase enzyme is normally produced by the body to help break down (digest) lactose.Lactose intolerance happens when your small intestine does not make enough of a digestive enzyme called lactase.
2)Many foods do not contain just saturated or unsaturated fats, which can make it difficult for a person to eliminate only one type. Most health organizations and dietary experts recommend eating saturated fats in moderation and replacing them with unsaturated fats when possible.
3)1)C10H16N5O13P3- ribose, a five-carbon sugar, three phosphate groups, and adenine , a nitrogen-containing compound (also known as a nitrogenous base)
2)C₆H₁₂O₆-carbon, hydrogen and oxygen.
3)CH₄N₂O-1 carbon,4 hydrogen ,2 nitrogen ,1 oxygen.
4)C16H18N2O4S-Carbon, hydrogen, oxygen, nitrogen, sulfur
5)C27H46O- protein
6) C19H28O2-(sorry i didn't know the elements)
7)C9H11NO2-amino acid
hope it helps!!!!
Bree Wakefield is a 19 year old college student, living in a dormitory on the campus of her university. She started to feel poorly and began to miss classes. She was diagnosed with a disease of the CNS ?
Answer:
We don't know. Possibly not
Explanation:
CNS diseases are related to the nervous system
symptoms include memory loss or lack of coordination
which doesn't seem to be the case
she probably is feeling a mild headache
What processes can change igneous rock into sedimentary rock?
Answer: Erosion
Explanation:The process of erosion and depositing rock grains (also known as sedimentation) can change igneous rock into sedimentary rock.
_is a molecule that directs all of a cells activities
Answer:
[tex]\boxed{\mathrm{Nucleus}}[/tex]
Explanation:
The nucleus directs all cellular activities. The nucleus also contains genetic material of eukaryotic organisms.
The free-energy changes of the individual steps in a pathway are summed to determine the overall free-energy change.
A. True
B. False
contrast primary growth and secondary growth
Answer:
There are contrast of the Primary growth and Secondary growth in many ways.
Explanation:
The Primary growth is to increase the length of that shoot and the root is referred to the primary growth.The primary growth act the way as shoot apical causing extension to the growth system into the root and ground they root are apical.The primary growth is the plant into that ground to contain water and nutrients that with the soil relation.The primary growth is that root can take different forms depends on the plant is Mono cot,the primary root replace by the stem after the plant germinates its called Adventitious root.The secondary growth is that performed to increase by the girth of the plant.Secondary growth is to produce the lateral cambiums that layer of tissue add to the plant growth.Secondary growth is that performed and support from the shoot system into the transporting that water and nutrients.Secondary growth is to provide the cross section of the stem and the replace with newer layer, the layer of that growth bark.Secondary growth is to consist that bark remain that the narrow of band, it root is transformed.S100A8 sex chromosome? yes or no
Answer:
yes !!
Explanation:
because it's yes !!
Answer:
YES
Explanation:
I know this because i looked it up
The valve present between right atrium and ventricle is
Which of the following is not a function of Mitosis? A. Growth and development B. Produce genetically identical daughter cells C. Produce genetically different daughter cells D. Replace damaged cells
Hormones perform important functions within the reproductive system. During puberty, secondary sex characteristics develop. Which hormone is responsible for the development of these characteristics in the female?
Answer:
estrogen
Explanation:
it helps in regrowth of endometrial regrowth ovulation and calcium absorption and is also responsible for breast development
Hii!! The correct answer is A. estrogen. (:
An sixty-year-old man has painful fluid-filled vesicles that have begun crusting over in a wide band across the left side of his lumbar area. He has a history of chickenpox. Based on this information, the likely disease is which is caused by:________
a. scabies, Pediculosis humanus
b. fever blisters, HSV-1
c. impetigo, Staphylococcus aureus
d. German measles, Rubella
e. shingles, varicella-zoster virus
Answer: shingles, varicella-zoster virus
Explanation:
It should be noted that shingles usually occur with old people and it causes a painful rash when the chicken pox virus is reactivated in the body.
Since the man is old and has painful fluid-filled vesicles that have begun crusting over in a wide band across the left side of his lumbar area and also has a history of chickenpox, it's very likely it is shingles.
"I can be single celled or multicelled. I can reproduce sexually or asexually. I can be heterotrophic or autotrophic. I am Eukaryotic. What am I?"
Answer:
The correct answer is a protist.
Explanation:
A eukaryotic organism, which cannot be categorized as an animal, plant, or fungus is known as protists. They are majorly unicellular, however, some of them are multicellular like algae. Some of the protists can attain energy for living by consuming other organisms, that is, they are heterotrophic. While some obtain energy from the surroundings via the process of photosynthesis, that is, they are also autotrophic.
The protists are mainly found in water, however, some of them also thrive in moist soil. These species can be seen anywhere on the Earth, where there is liquid, even within human beings. The reproduction is some of the protists takes place sexually, that is, with the help of gametes, while in some of the protists asexual reproduction also takes place, that is, by the process of binary fission.
Which of the following groups could be identified using the biological species concept? Select all that apply. Select all that apply. bacteria living today extinct dinosaurs sunflower species living today lizard species living today
Answer:
Bacteria, Sunflowers, Lizards.
Explanation:
They are all biological species due to being apart of flora and fauna. It wouldn't be dinosaurs since biologists study living things, dinosaurs are extinct.
The groups 'sunflower species living today' and 'lizard species living today' could be identified using the biological species concept.
The biological species concept defines a species as a special group of interfertile individuals.These individuals can then cross in order to produce fertile offspring and thus perpetuate the species.The biological species concept was developed by the biologist Ernst Mayr.In conclusion, the groups 'sunflower species living today' and 'lizard species living today' could be identified using the biological species concept.
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what organ lies over the surface of the heart
Answer:
lungs
Explanation:
Where does translation and transcription occur in prokaryotic cells? (1 point)
O nucleus
O cytoplasm
O ribosomes
ocell membrane
Answer:
Cytoplasm
Explanation:
Answer:
operon
Explanation:
A purebred tall pea plant is cross-pollinated with a tall, heterozygous pea plant. Use a Punnett square to determine the probability the offspring inherita
recessive short allele. (I point)
75%
25%
0%
50%
Answer:
The correct answer is - 25%.
Explanation:
A cross pollination between purebred tall pea plant and a heterozygous pea plant occurred as per the given condition. TT is the allele representation of the purebred plant and heterozygous plant is represented by Tt, so the gametes will be formed would be - T & T and T & t allele.
The Punnett square of this cross is attached with the answer,
So the probability of short allele would be:
= (2/8) *100 , (where 2 is the number of short allele in offspring where 8 is total number of alleles)
= (1/4) *100
= 25%
What is a biological approach to determining when a mother and her conceptus become separate individuals?
Answer:
Electroencephalography.
Explanation:
Electroencephalography is used to measure brain activity in terms of electrical activity. It is done by attaching electrodes on the scalp, or sometimes by placing electrodes directly in the brain. Using electroencephalography can help determine when the fetus starts having its own brain activities, which means that it is now a separate entity distinguishable from its mother. Using electroencephalography to see brain waves can give us a deeper insight into the age old complicated issue of when a mother and her conceptus become separate individuals.
The functions of the oral cavity include all of the following except Select one: A. mechanical processing of food. B. absorption of monosaccharides. C. digestion of carbohydrates. D. lubrication. E. sensory analysis of material before swallowing.
Answer:
C. Digestion of carbohydrates.
Explanation:
The function of the oral cavity that is not performed by the oral cavity is B) absorption of monosaccharides.
What is oral cavity?The oral cavity, also known as the mouth, plays a crucial role in the digestive process. Its main functions include mechanical processing of food by chewing and grinding, sensory analysis of material before swallowing through taste buds, and lubrication of food through the production of saliva.
The oral cavity also begins the process of digestion by breaking down carbohydrates with the help of enzymes in saliva. Additionally, the oral cavity serves as the entry point for air during breathing and speech. Proper oral health, including brushing, flossing, and regular dental check-ups, is important for maintaining overall health and wellness.
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The diagram represents a food pyramid. The concentration of the pesticide DDT in individual
organisms at level D is higher than the concentration in individuals at level A because DDT is
A. produced by organisms at level C ingested by
those in level D
B. passed through levels A, B, and C to organisms
at level D.
C. excreted by organisms at level A as a toxic
waste.
D. synthesized by organisms at level D.
Answer:
The answer is "Choice b".
Explanation:
In the given question diagram is missing. so first, we define the diagram after that we explain why the above given choice is correct.
In the attached file the food pyramid can be a divide into the level, in which the D pesticides use the "dichloro-diphenyl-trichloroethane ", which concentration is higher than its entities from the level of A because DDT is transferred with species at level D by levels A, B, and C, that's why the choice "b" is correct.
A persons thoughts are central to which type of therapy?
Answer:
Cognitive therapy
Explanation:
is a form of psychotherapy that focuses on how a person's thoughts lead to feelings of distress. The idea behind cognitive therapy is that how you think determines how you feel and act. Cognitive therapists help their clients change dysfunctional thoughts in order to relieve distress.
protains after digestion converted into
a.carbonhydrates
b.small globules
c.amino acids
d.starch
Answer:
I hope small globules.
Which of the following will most likely result in anaerobic respiration? A. Running B. Walking C. Sitting D. Solving Algebra equations
Answer:
A-Running
Explanation:
Anaerobic respiration is the breakdown of glucose to produce energy in the absence of oxygen. We usually respire anaerobically when we exercise so running would be the most likely answer.
Hope it helps...
What’s the food chain for algae,seal lion,zooplankton,squid and salmon
Answer:
algae, zooplankton, salmon,squid, seal,lion
The food chain is algae, zooplankton, salmon,squid, seal,lion.
Foodchain provides blockchain technology to trace and digitally authenticate food products, enabling a transparent, safe and reliable supply chain ecosystem.
What are the 4 food chains?It is a way of classifying animals, plants, and fungi that eat other organisms in order to survive. The four levels in this food chain are: primary consumers, secondary consumers, tertiary consumers, and finally decomposers or phytoremediators.
Thus, algae, zooplankton, salmon,squid, seal,lion.
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Is fertile soil renewable or non renewable?
Answer:
Its preservation is essential for food security and our sustainable future. Soil is a finite resource, meaning its loss and degradation is not recoverable within a human lifespan
Explanation:
Which of these statements most accurately describes currencies in North America
Answer:
North American countries have done away with separate currencies. Each country in North America uses its own currency. 2. See ...
True or dalse. The cell that produces interferon is protected from the infectious agent.
Answer:
True
I hope this helps!
Non segmentation allows for evolutionary innovation in body form. True or false
Answer:
True
Explanation:
