Telomerase activity is controlled during development and is extremely low in somatic (body) cells, virtually undetectable. These somatic cells age because they do not frequently use telomerase.
Telomeres are repetitive sections at the very ends of chromosomes that are present in a variety of eukaryotic species, including humans and unicellular protists. Each round of DNA replication wears down a little portion of the telomeres, which serve as caps to safeguard the interior chromosomal regions.Most somatic (body) cells do not typically have telomerase activity, but certain adult stem cells and germ cells—the cells that produce sperm and eggs—have.Adult germ cells, tumor cells, and fetal tissues all contain telomerase. Telomerase activity is controlled during development and is extremely low in somatic (body) cells, virtually undetectable. These somatic cells age because they do not frequently use telomerase.learn more about telomerase here: https://brainly.com/question/14213408
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3. Which of the following statements is NOT true about birds?
O All birds breathe using lungs.
O All birds have feathers.
O All birds are endothermic.
All birds are capable of flight.
Answer:
D. All birds are capable of flight
Explanation:
All birds are capable of flight is a false statement.
An example of a bird that cannot fly is an Ostrich.
Hope this helps!
The hormone secretin is released by endocrine cells in the duodenal mucosa in response to?
The hormone secretin is released by endocrine cells in the duodenal mucosa in response to duodenal pH changes
What are hormones?Hormones can be defined as those chemical substances or messangers which are produced by the endocrine glands and are released to the sites where they are needed in the body.
Below are examples of some hormones:
AdrenalineAldosteroneInsulinGlucagonAntidiuretic hormoneSo therefore, the hormone secretin is released by endocrine cells in the duodenal mucosa in response to low duodenal pH changes
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Assuming that the rest of the genome is normal, cells with an inactivating mutation in one copy of a tumor-suppressor gene with the second copy of the gene still wild-type are most likely to_____.
Assuming that the rest of the genome is normal, cells with an inactivating mutation in one copy of a tumor-suppressor gene with the second copy of the gene still wild-type are most likely to show no changes in DNA sequence.
Tumor suppressor genes are normally present in the body. These function properly and keep processing the cell growth and cell death (apoptosis). It can also suppress tumor development. If both copies of a tumor suppressor gene is mutated then only it cause a change in cell growth and form a tumor. So these are recessive in nature. And if only one gene is mutated then it shows no mutation. When a tumor suppressor gene is inactivated by mutation, the protein it encodes is not produced or does not function properly, and as a result, uncontrolled cell division can occur. Such mutations can contribute to the development of cancer.
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If you, like mendel, grow plants in the lab, and cross/breed short (tt) pea plants with another (tt) short pea plants, the offspring will be:_________
Cross/breed short (tt) pea plants with another (tt) short pea plants, the offspring will be also a short/dwarf pea plant(tt) due to the Monohybrid nature of the cross.
Monohybrid cross is responsible for the inheritance of one gene. It can be easily shown through a Punnett Square.
(Refer the picture attached for reference)
Thus the Genotype is "tt" and the Phenotype is "small".
"tt" is an example of pure gametes that are haploid. These gametes are always pure and do not possess homologous chromosomes. Instead, they possess one chromosome of each type, either recessive or dominant.
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4. Which of these is an example of a vertebrate?
snails
frogs
sea stars
squid
Frogs are the vertebrates as they possess a backbone. The others fall under invertebrates as they do not possess a backbone.
Animals can be classified based on the presence or absence of a backbone. Vertebrates are animals with a backbone.
Vertebrates are classified into five subgroups:
Mammals : Mammals are warm blooded vertebrate animals that possess mammary glands and feed their young ones with the milk produced from their mammary glands. Example : cats, dogs etc.Birds : Birds are warm blooded vertebrate animals that have the ability to lay eggs and possess a beak, feathers and a lightweight skeleton. Example : pigeon, eagle etc.Reptiles : Reptiles are cold blooded vertebrate animals that possess limbs. dry scales on their skin and can also lay eggs. Example : crocodile, tortoises etc. Amphibians : Amphibians are also cold blooded vertebrate animals that spend their lives partly in water and partly in land. Example : frogs, salamanders etc.Fish : Fish are cold blooded vertebrate animals that live in water, possess fins and gills and can produce eggs. Example : sharks, catfish etc.Learn more about vertebrates at
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Answer:
Frogs
Explanation:
I took the quiz and got it right! Hope this helps!! :)
Why can the researches of Robert Hooke and Anton van Leeuwenhoek be considered the beginnings of microscopy and microbiology
Answer:
Biology is the study of living things and their processes of life. Both Hooke and Van Leeuwenhoek made major, early contributions to biology.
Robert Hooke
Robert Hooke is best known for the discovery of the cell. Using a microscope, Hooke looked at the makeup of a piece of cork. Through the microscope, he saw box-like structures. What he saw would later be known as cell walls. He discovered that these structures were cells, the building blocks of all life.
His discovery and future research contributed greatly to the cell theory.
Anton van Leeuwenhoek
Leeuwenhoek made his discovery after Hooke, but it was still important. He is best known for the discovery of bacteria. Unlike Hooke, Leeuwenhoek did not study plant cells; instead, he focused on protists (like amoebas) and prokaryotes (like bacteria). For his work with unicellular organisms, he is often called the "Father of Microbiology."
Androgens are hormones that promote the development of ________ characteristics.
Androgens are hormones that promote the development of male characteristics.
What are Hormones?
These are chemical messengers which are secreted into the blood for different functions in the body.
Androgens are sex hormones which are involved in the development of the male reproductive system.
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During glacial maxima, australia, new guinea, and tasmania were a single land mass called?
During glacial maxima, Australia, new guinea, and Tasmania were a single land mass called Sahul.
The single Pleistocene continent known as Sahul united Australia with New Guinea and Tasmania. Rising sea levels gave rise to the distinct landmasses that we can now recognize, even though the sea level at the time was up to 150 meters (490 feet) lower than it is now.Australia, New Guinea, Tasmania, and Seram were all parts of the ancient continent Sahul.Since the Last Glacial Maximum, sea levels have risen. Around 18,000 years ago, Sahul began to be partially submerged. Sea levels kept rising until roughly 5000 BCE.After leaving Africa, early human migrations began in Sahul and Sunda. According to recent study, hundreds of individuals traveled in groups on bamboo rafts and eventually settled on Sahul.
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1: At what level of visual processing is a visual illusion created?
2: how are blind spots and visual illusions related?
A psychological phenomenon known as a visual illusion is characterised by a perception that seems to deviate from objective reality. Visual illusions are perceived during the process of establishing size constancy from a two-dimensional retinal image in visual processing. Thus, the perception of visual illusions involves both low-level and high-level vision.
There is evidence to show that the illusion, which refers to a region of space that is invisible owing to occlusion (a blind spot), is still caused by visual mechanisms and can be just as convincing and potent as common visual illusions.
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How would an increase in the sympathetic nervous system increase stroke volume? decreased end diastolic volume increased end systolic volume increased contractility increased end diastolic volume
The correct answer is (c) increased contractility which increases the stroke volume.
Stroke volume is the blood volume that is pumped by left ventricle of heart during each systolic contraction or the difference in end diastolic and end systolic volume. Sympathetic nerves arise in the intermediolateral nucleus of lateral grey column near the middle of spinal cord.
Increase in the sympathetic nervous system increases the myocardial contractility because sympathetic nerves innervate the myocardium which as a result increases the stroke volume and heart rate and ultimately a higher cardiac output is observed.
Therefore, with increase in sympathetic nervous system stronger contactility is observed which results in higher stroke volume.
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During conception there are three stages. What takes place during the second stage which is fertilization?.
Answer:
well the sperm fertilises the egg or zygote
darwin spent five years collecting information while on a voyage aboard the ____________
Which of the following factors affects how much kinetic energy an object has? A. Mass B. Height C. Time D. Distance
Answer:
the right basic answer is mass and velocity or mass and speed
therefore there's no other choice than "A"
Fungi differ from bacteria in that fungi Group of answer choices Have cell walls. Spoil food. Are cellular. Have a nucleus. Have DNA.
yes true because they differ from bacteria
The skull is composed of two distinct groups of bones: the cranial bones and the facial bones.
a) true
b) false
Answer:
true
Explanation:
as they are the bones that make up your face
The typical order for the major steps of enzyme isolation would be?
The typical order for the major steps of enzyme isolation would be
Homogenization, salt fractionation, column chromatography, Electrophoresis.Proteins called enzymes operate as natural catalysts for cellular non-spontaneous chemical events, starting and accelerating them. Despite their high turnover rates, they are picky and precise in their behavior.
Cell extract preparation, often known as cell lysis, is a stage of the capture phase. It entails liberating the cellular material from the host cells or tissue into an extraction buffer, producing the crude extract while preserving and stabilizing the target protein.The phenomenon known as "salting-out" occurs at very high ionic strengths, where protein solubility declines as ionic strength rises.As a result, salting out can be used to separate proteins according to how soluble they are in salt solutions.One of the most popular techniques for purifying enzymes is column chromatography. The foundation of chromatography is the idea that mixtures of molecules applied to surfaces or solids, and fluid stationary phases (stable phases), separate from one another while moving with the help of a mobile phase.Specific proteins in the blood can be measured using a test called protein electrophoresis. Based on their electrical charge, the test divides blood proteins into several groups.learn more about enzyme isolation here: https://brainly.com/question/22318217
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blood carries _____ to the other organs in the body
The styloid process, zygomatic process, and auditory ossicles are associated with the?
The styloid process, zygomatic process, and auditory ossicles are associated with the Temporal lobe.
The lower lateral walls of the skull are primarily made up of the temporal lobe. The bulk of the cranial nerves traverses it, which houses the middle and inner parts of the ear. Five separate components make up the temporal bone. Most of the bone comprises the squamous, tympanic, and petromastoid portions, with the zygomatic and styloid processes extending outwards. Sound waves are converted into pressure waves in the perilymph and endolymph via the tympanic membrane, the auditory ossicles, and other structures.
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write the role of HCL in digestion
Answer:
Hydrochloric acid contributes to protein digestion by supplying H+ which activates pepsinogen, the precursor to pepsin. Pepsinogen is secreted by chief cells in the gastric glands of the body and antrum of the stomach.
Explanation:
˙˚ʚ(´◡`)ɞ˚˙
Answer:
Activates pepsin enzyme
Explanation:
Carbohydrates are digested into maltose in the mouth and protein digestion begins in the stomach. In the stomach, food undergoes chemical as well as physical digestion.Due to the peristaltic action of the muscles the bolus breaks up in the stomach wall and mixes well into a chyme. ( Physical digestion )Several secretions flow into the stomach. It is collectively known as gastric juice.Also the juice contains pepsin and HCL acid.Here, the enzyme pepsin acts on the proteins in the food and forms polypeptides, which are intermediate products of life. ( Chemical digestion )And the function of the HCL acid is to stimulate pepsin enzyme and make it activeWhich substance is administered to suppress inflammation and as an immunosuppressant?
The Cortisone substance is administered to suppress inflammation and as an immunosuppressant.
In controlling inflammation, the major effect of corticosteroids is to inhibit the synthesis of multiple inflammatory proteins through suppression of the genes that encode them.
Cortisone is a type of medication called a corticosteroid. Doctors use these drugs to treat inflammation (swelling) caused by injury and illness. Sometimes cortisone shots are called corticosteroid shots.
Corticosteroids are a fast-acting class of drugs that can reduce inflammation and overactive immune system responses. Corticosteroids bind to the glucocorticoid receptor, inhibiting pro-inflammatory signals, and promoting anti-inflammatory signals. The duration of action is moderate as it is generally given once daily.
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In contrast, ____________ reactions, such as serotyping for ____________ species identification, produce insoluble antibody-antigen complexes in vitro that can be visualized for positive identification of a microbial infection.
In contrast, precipitation reactions, such as serotyping for microbial species identification, produce insoluble antibody-antigen complexes in vitro that can be visualized for positive identification of a microbial infection.
What are microbial species?Microbial species is a group of individuals where the observed lateral gene transfer within the group is much greater than the transfer between groups.
There may be at least 1 billion different types of microbes on Earth, if not more, according to current estimates. Despite the truly astounding diversity of microbes, they can all be divided into five major categories: viruses, bacteria, archaea, fungi, and protists.
The most popular molecular method for identifying bacteria is probably PCR, particularly Real-Time PCR. By quickly detecting and identifying microbial species from clinical samples, PCR helps expedite diagnostic processes. There are various PCR-based techniques.
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What adaptation do plants on the forest floor need to reproduce in a broadleaf forest?
The ______________produces gastrin that activates secretion of hcl and pepsinogen within itself.
Stomach
The stomach produces gastrin that activates the secretion of HCl and pepsinogen within itself.
What is the role of stomach in digestion?The esophagus transports food to the stomach. Once there, the stomach aids in food digestion through muscle contractions and chemical enzymes.
The stomach is made up of three layers: an outward longitudinal layer that mechanically breaks down food, a center circular layer, and an oblique layer.
Food is further broken down by acids like hydrochloric acid creating a fluid called chyme. By secreting stomach acids, a network of cells, including parietal cells, chief cells, G-cells, mucous neck cells, and D-cells, aid in the chemical digestion of food.
Food can also be stored in the stomach until it is digested further down the digestive system.
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Create a list of environmental factors that may affect the race of gas production in the aquatic plant in Model I. These factors could become variables in an experiment.
Environmental factors like light, temperature, water, humidity, and nutrition may have an impact on the aquatic plant's ability to produce gases.
Temperature, food, pollutants, population density, sound, light, and parasites are a few examples of environmental influences. Numerous other types of stress may have effects that are comparable to those produced by the variety of environmental factors that have been demonstrated to induce asymmetry.
Environmental factors have an impact on daily life and are a major contributor to health disparities between regions. Any biotic or abiotic component that affects living creatures is referred to as an environmental factor, ecological factor, or eco factor. The temperature outside, the amount of sunlight, and the pH of the soil and water where an organism dwells are examples of abiotic factors.
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The molecule that functions as the reducing agent (electron donor) in a redox reaction _____.
The molecule that functions as the reducing agent (electron donor) in a redox reaction loses electrons and also loses energy.
What is a redox reaction?A redox reaction is a type of chemical reaction where one molecule gains electrons (the oxidant agent) while the reducing agent loses electrons.
Electrons are negatively charged subatomic particles that atoms have in their orbits and serve to form chemical bonds.
An example of an oxide-reduction (redox) reaction is the oxidation of iron, a process where this metal is oxidized and simultaneously oxygen is reduced.
In conclusion, the molecule that functions as the reducing agent (electron donor) in a redox reaction loses electrons and also loses energy.
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The ________ valve opens when left ventricular pressure exceeds aortic blood pressure.
The Aortic valve opens when left ventricular pressure exceeds aortic blood pressure.
The pulmonary valve and aortic valve, two one-way valves that divide the ventricles from the main arteries, are known as semilunar valves. The pulmonary valve divides the right ventricle from the pulmonary artery, while the aortic valve divides the left ventricle from the aorta.
when the semilunar valves open and the ventricular pressure surpasses the arterial pressure, they are injected into the major arteries. However, arterial pressure rises when the ventricles relax.
The semilunar valves close due to ventricular pressure. Because of the increased pressures in the seal semilunar valve, the aorta, and the pulmonary artery force the flow back toward the ventricles.
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I WILL MARK U BRAINLIEST IF U ANSWER THIS QUESTION!!
Where is the frog's heart compared to its lungs? How do the locations of these organs affect interactions between the frog's respiratory and circulatory systems?
A frog's heart is situated in the chest, next to the lungs. The frog's heart is connected to a pair of sac-like organs called the lungs, which aid in breathing. Blood that is rich in oxygen is pumped from the lungs to the rest of the body by the heart.
What is anatomy?Anatomy is a branch of biology that focuses on identifying and describing the physical characteristics of living creatures.
A frog's respiratory system has three alternative pathways for oxygen to enter the body: through the skin, the lungs, and an unique mouth lining.
The circulatory system is connected to each of these respiratory surfaces, allowing the blood to be oxygenated.
The heart of a frog is located near to the lungs in the chest. The lungs of the frog are a pair of sac-like organs that help with breathing and are connected to the heart. The heart pumps oxygen-rich blood from the lungs to the rest of the body.
Thus, this way, the locations of these organs affect interactions between the frog's respiratory and circulatory systems.
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Which of the following governs the opening and closing of stomata?
a. Leaves
b. Phloem
c. Roots
d. Flowers
Answer:
isn't there supposed to be an option mentioning guard cells tho :/
Explanation:
The ________ plate count (SPC) method involves diluting 1.0m of bacterial culture into a series of water blanks, and then taking a sample from the water blanks to add to empty petri plates which will be filled with melted agar.
The standard plate count (SPC) method involves diluting 1.0m of bacterial culture into a series of water blanks, and then taking a sample from the water blanks to add to empty petri plates which will be filled with melted agar.
The standard plate count is a method used in microbiology, which is used to gain an insight to estimate the density of bacterial population which is present in a bacterial culture broth. This is done by plating a small concentration of the culture in a petri-dish and then counting the colonies which form in the petri-plate. This method is used mostly in the food industry, to find the density of mesophilic bacteria in food. This method is extremely essential to determine the primary source of the bacterial contaminant.
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How are the hip bones in a frog different from the human pelvis?
Answer:
A frog's pelvis(hip bones) can slide up and down its spine, which may help it jump. The vertebrae at the bottom end of the spine are fused into one bone called the urostyle much like our coccyx(tailbone) - the remains of their tadpole tail.