why might a cell employ several rna polymerases to produce multiple rna transcripts of a gene at any one itme

Hemoglobin: The high iron-containing protein in red blood cells (RBCs) is known as hemoglobin. This gives the blood a red color.

It has two main functions: it carries oxygen from the lungs to tissues of the body, and it carries carbon dioxide from cells back to the lungs for excretion.

Functions of hemoglobin:

Consequences of hemoglobin deficiency:

Hemoglobin deficiency reduces the blood's oxygen-carrying capacity.

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Answer:

A

Explanation:

A researcher found the fetus of an unknown animal. By measuring the number of germ layers in an embryo it can be determined whether an organism is a protostome or a deuterostome. Here option B is correct.

The measure that could be used to determine whether an unknown embryo is a protostome or deuterostome is the number of germ layers in the embryo. This is because protostomes and deuterostomes have different patterns of embryonic development, which are reflected in the number of germ layers they possess.

Protostomes typically have three germ layers: the ectoderm, mesoderm, and endoderm. Deuterostomes, on the other hand, have four germ layers: the ectoderm, endoderm, mesoderm, and an additional layer called the archenteron.

During embryonic development in protostomes, the blastopore (the opening of the developing digestive system) develops into the mouth, while in deuterostomes, it develops into the anus. This difference in development is reflected in the number of germ layers, with deuterostomes having an additional layer that gives rise to the lining of the digestive tract.

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Complete question:

A researcher finds an embryo of an unknown animal. By which measure could she determine whether the organism is a protostome or deuterostome

A. The size of the embryo

B. The number of germ layers in the embryo

C. The presence or absence of a notochord in the embryo

D. The type of feeding mechanism used by the embryo

The RNA world hypothesis suggests that life on Earth began with a simple RNA molecule that could copy itself without help from other molecules. DNA, RNA, and proteins are central to life on Earth.

RNA was thought of as little more than a messenger between DNA and proteins, carrying instructions as messenger RNA (mRNA) to build proteins. However, RNA can do far more. It can drive chemical reactions, like proteins, and carries genetic information, like DNA. And because RNA can do both of these jobs, most scientists think life as we know it began in an RNA world, without DNA and proteins.

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Answer:

Answer down below!

Explanation:

Answers ranging from top to bottom:

Answer:

Wfjeifjoijefq

Explanation:

During both DNA replication and transcription, the construction of a new strand involves similar rules that involve hydrogen bonding.

Here's how it works:
1. In DNA replication, the double-stranded DNA unwinds with the help of enzymes. The two strands separate, and each strand serves as a template for the synthesis of a new complementary strand.

Similarly, in transcription, a specific region of the DNA strand, known as the template strand, is used to synthesize a complementary RNA strand.
2. In both processes, the base pairing rules apply. Adenine (A) always pairs with thymine (T) in DNA replication, and adenine (A) pairs with uracil (U) in transcription.
This means that when constructing a new DNA strand, each adenine (A) on the template strand will have a thymine (T) on the newly synthesized strand.
Similarly, during transcription, each adenine (A) on the DNA template strand will have a uracil (U) on the newly synthesized RNA strand.
3. Hydrogen bonds form between the complementary bases. In DNA replication, hydrogen bonds form between adenine (A) and thymine (T), and in transcription, hydrogen bonds form between adenine (A) and uracil (U).
4. The new strands are synthesized in a 5' to 3' direction. This means that new nucleotides are added to the growing strand at the 3' end.
Both DNA replication and transcription involve the addition of nucleotides in a specific order, following the base pairing rules, to create a new complementary strand.
In conclusion, the similar rules of hydrogen bonding between complementary bases, base pairing rules, and the 5' to 3' directionality underlie the construction of new strands of DNA during DNA replication and RNA during transcription.

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Answer:

everyone has dna becasue our dna tells us to do things

Explanation:

Answer:

d. All of the above

Explanation:

All of the given choices are reasons to study the ocean carbon cycle. The ocean occupies about 70% of the earth surface area and it plays important roles in carbon cycling.

Answer:

The real answer is A

Explanation: edge 2021

During transcription, the adenine on the left side of the sequence was the last nucleotide added to a portion of the mRNA.

When RNA polymerase crosses the stop (termination) sequence in the gene, transcription is terminated, marking the end of the process.After the mRNA strand is complete, it is separated from the DNA. A strand of RNA that is complementary to the DNA template is made by RNA polymerase. The three phases of translation are initiation, extension, and termination. When the DNA template strand is read in the 3' to 5' direction, the RNA strand in the 5' to 3' direction is synthesized.

Translation (from mRNA to protein) and transcription (DNA to mRNA) are so closely linked in prokaryotic cells that translation often begins before transcription is complete.

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The question was incomplete. Check below the complete question.

The following is a portion of an mRNA sequence: 3'-AUCGUCAUGCAGA-5'. During transcription, was the adenine at the left-hand side of the sequence the first or the last nucleotide added to the portion of mRNA shown?

Answer:

Proximal tubule

Explanation:

Calcium is an important element in the body with majority of its percentage located in the bones. Its ions perform different functions in the body which includes muscle contraction, hormones secretion and including all other functions.

Calcium ion is absorbed in the intestines and then reabsorbed in the kidney. Much percentage of calcium ions is reabsorbed by passive mechanisms in the proximal convoluted tubule of the kidney tubule as compared to all other parts of the kidney tubule.

Substrates are held in the active site of an enzyme by hydrogen and ionic bonds.

Ionic bonds are attracted by electrostatic forces, whereas hydrogen bonds are intermolecular forces. Ionic bonding occurs between permanent anions and cations, whereas hydrogen bonds occur between partial positive and partial negative charges. This is the main distinction between the two types of bonds.

In that they are created by the attraction of atoms with opposing polarity, hydrogen bonds are comparable to ionic bonds in this regard. They lack the strength of full or complete charges, however, as they are formed by the interplay of partial charges.

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Answer:

discupa eu não sei

uma bela noite abençoe

The correct option is C, Proteins damaged by stresses accumulate at old poles, thereby allowing new poles to continue growing.

Proteins are macromolecules that play crucial roles in the functioning and structure of living organisms. Composed of long chains of amino acids, proteins are involved in a wide range of biological processes, including enzyme catalysis, cell signaling, immune response, and structural support.

Each protein's unique structure is determined by its amino acid sequence, which is encoded by genes in DNA. There are 20 different amino acids that can be combined in various ways to form proteins with distinct shapes and functions. This diversity allows proteins to carry out specific tasks within cells and tissues.

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1. At what age do children begin to use language?---> E. Developmental Psychology

Developmental psychology refers to a branch of psychology that investigates the physical, psychological, neurological, cognitive, social and moral growth and development individuals go through during their entire lifespan, from birth to death. Developmental psychologists investigate topics such as language acquisition in childhood, biopsychological changes experienced by adolescents, cognitive functioning in old age, etc.

2. How do adolescent brains develop?---> B. Biopsychology

Biopsychology refers to branch of psychology that investigates the biological basis or influence on our behavior. Specifically, biopsychology examines how brain anatomy and function influence our behavior, how hormones influence our behavior, how physical deformities in the brain affect behavior, the role of genetics in behavior, etc. A biopsychologist might study topics such as the effect of suffering a stroke on behavior and cognition, how brain abnormalities are linked to mental or learning difficulties, the influence of genetics on personality, etc.

3. How can I lead a happier life?---> A. Positive psychology

Positive psychology is the scientific study of human happiness, optimal functioning, and qualities that enable humans to thrive and lead fulfilling lives. Positive psychology most commonly teaches us how to live a happy and rewarding life, and how to appreciate our own innate qualities and virtues. Unlike other areas of psychology, positive psychology focuses on strengths that a person has and fortifying those strengths, rather than focusing on limitations.

4. How do our thoughts affect our self-concept?---> C. Cognitive psychology

Cognitive psychology is an area of psychology that focuses on human thoughts, perceptions, memory, attention, appraisals, etc. Cognitive psychologists investigate topics such as memory capacity, cognitive biases, how our thoughts affects our self-perception, etc.

5. How can we reduce prejudice?---> D. Social psychology

Social psychology is a branch of psychology that focuses on a broad range of topics such as: group behavior and influences on individual behavior and beliefs, prejudice, discrimination, interactions between individuals and how they vary across cultures, etc. Furthermore, social psychology provides insight into the causes of prejudice and discrimination, and what can be done to reduce it.  

Thus, this could be the answer.

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A human skin cell during the g2 phase would have Four by 3.2 MB .

A cell has 3 elements: the cell membrane, the nucleus, and the cytoplasm. The nucleus is a structure inside the cell that incorporates the nucleolus and the maximum of the cellular DNA. it's also in which maximum RNA is made.

Cells are the basic constructing blocks of all residing things.

Cells provide shape and the necessary function for all dwelling matters, from microorganisms to ordinary people. Cells residence the organic equipment that makes the proteins, chemical substances, and indicators chargeable for the whole thing that occurs interior our bodies.

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Freshwater has a low amount of dissolved salt and is used for drinking and other purposes. The amount of freshwater locked in the glaciers is 68% and that of the total on earth is 2%.

Freshwater is the less salty and feasible water that is used for drinking, bathing, washing etc. It is present in very less amount on the planet as most of the parts are covered with salty water.

The total of the freshwater locked in the glaciers and ice caps are 68% which is not accessible and the total of freshwater that accounts for the earth which can be used is only 2% and is found in the form of the rivers, lakes and underground sources.

Therefore, the total freshwater available on the planet is 2%.

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Answer:

Behavioural-made by an organism that helps it to survive/reproduce.

Physiological-a body process that helps an organism to survive/reproduce.

Structural -a feature of an organism's body that helps it to survive/reproduce

Explanation:

Answer:ribosome

Explanation:

Answer:

hydrophilic

Explanation:

Large polar or ionic molecules, which are hydrophilic, cannot easily cross the phospholipid bilayer. Charged atoms or molecules of any size cannot cross the cell membrane via simple diffusion as the charges are repelled by the hydrophobic tails in the interior of the phospholipid bilayer.

Answer:

D) wearing sunglasses to protect eyes from UV rays

Explanation:

Answer:

D) wearing sunglasses to protect eyes from UV rays

Explanation:

hope you have a good day

Answer:

Excretion

Explanation:

The excretory system removes cellular wastes and helps maintain the salt-water balance in an organism. When cells break down proteins, they produce nitrogenous wastes, like urea. The excretory system serves to remove these nitrogenous waste products, as well as excess salts and water, from the body.

Solution:

Advantages of solar appliances:

- Renewable Energy Source

- The ecological footprint is much smaller since greenhouse gases are not generated, since coal burning is not used.

- Reduces Electricity Bills

- Diverse Applications: solar energy can be used to produce electricity in areas without access to the power grid, distill water in regions with limited clean water supplies, and power satellites in space.

- Low Maintenance Costs: Most solar panel manufacturers offer a 20-25 years warranty. Solar power systems only need to be relatively clean.

There are no moving parts, there is no wear. The inverter is usually the only part that needs to be changed after 5-10 years. It works continuously to convert solar energy into electricity and heat (solar PV vs. solar thermal).

Disadvantages of solar appliances:

- The initial cost of purchasing a solar system is fairly high.

- Weather-Dependent: Solar panels are dependent on sunlight to effectively gather solar energy. Therefore, a few cloudy, rainy days can have a noticeable effect on the energy system.

- Solar Energy Storage Is Expensive: the batteries, used in off-the-grid solar systems, can be charged during the day so that the energy is used at night. This is batteries are expensive.

Biotic factors in an ecosystem are the living organisms or the participants in the foob web. They count on each other for their survival. The biotic factors in the foob web provided are the producers, consumers and decomposers. Abiotic factors in an ecosystem are rocks, soil, and water that collaborate with biotic factors to provide them with the nutrients they needed to survive. Sunlight, air, soil, and minerals are also examples of abiotic factors. Sunlight gives energy so that plants may use them i order to grow. This ultimately holds up the whole community of an ecosystem. Air also connects with plants to help them grow by providing an origin of CO2 and other nutrients.

Answer:

The probability of two healthy Tay-Sachs carriers having a child that has the disease will be \(25\) %

Explanation:

It is given that Tay Sachs is a recessive disorder which means the genotype must both recessive allele.

Let the dominant normal allele be T and the recessive diseased allele be t

Genotype of a healthy Tay-Sachs carriers will be Tt

Tt * Tt

TT, Tt, Tt, tt

Only child with genotype tt will have Tay-Sachs disease

Hence the probability of two healthy Tay-Sachs carriers having a child that has the disease will be \(\frac{1}{4} * 100 = 25\) %

Answer:

Humans have a lot of skin cells. They shed around 500 million skin cells each day.

Answer:

about 1.6 trillion skin cells

Explanation:

Scientists estimate that the human body is made up of around 10 trillion cells in total. Your skin makes up about 16 percent of your body weight, which means you have roughly 1.6 trillion skin cells. It can be less or greater depending on your height and weight.

Answer:

D

Explanation:

I think it is D. Please give me brainliest

Answer:

Diastolic pressure

Explanation:

The reading on the pressure gauge at this point represents the Diastolic pressure. In a medical context, this is the pressure of the blood in the arteries when the heart is filling. In the numerical readings, this is represented by the lower end of the two blood pressure measurements. For example, if the individual's blood pressure is taken and the measurement of 120/80 is taken, then 80 is the diastolic pressure in this scenario.