Answer:
Complete the following statements.
Calcium ions are necessary to activate the binding sites on the actin filaments.
The molecule ATP is required each time the myosin head detaches from one site and reattaches to another.
Explanation:
just got it from edge
Which best describes a benefit of using DNA technology in medicine?
DNA technology contributes to personalized medicine by enabling treatments tailored to an individual's genetics, thereby revolutionizing drug dosing through pharmacogenomics. It facilitates early diagnosis and intervention for hereditary diseases and accelerates the drug discovery process by identifying disease-specific genetic targets.
One of the key benefits of using DNA technology in medicine is the potential for personalized medicine. With the sequence of DNA bases known, it becomes possible to tailor treatments to an individual's genetic makeup. This approach enhances the effectiveness of medications and reduces the risk of adverse drug reactions. For instance, pharmacogenomics, a field born from DNA technology, examines how genetic variations affect an individual's response to drugs, allowing for more precise and effective dosing. Additionally, DNA technology aids in the early diagnosis of hereditary diseases, potentially even before symptoms present, enabling prompt interventions. Another application of such technology is the discovery of novel drugs, which is made more efficient as researchers target specific genes and proteins involved in diseases.
Genomic knowledge is also very helpful for diagnosing various conditions, such as different types of cancer, cystic fibrosis, and Alzheimer's disease among others, by identifying linked mutations. Furthermore, the production of human insulin via recombinant DNA methods and the potential for gene therapy are examples of how DNA technology has already impacted medicine significantly. The Human Genome Project, in particular, has played a pivotal role in various medical advancements by providing comprehensive knowledge of the human genetic code.
The higher risk for breast cancer in obese women after menopause is thought to result mainly from chronic exposure of
Answer;
Estrogen
The higher risk for breast cancer in obese women after menopause is thought to result mainly from chronic exposure of Estrogen.
Explanation;
Being overweight is associated with increased risk of breast cancer, especially for women after menopause.
Fat tissue is the body's main source of estrogen after menopause, when the ovaries stop producing the hormone.
Coronary heart disease is caused by a buildup of plaque in the arteries that supply blood to the heart. when the flow of blood to the heart is restricted or blocked, the heart can be damaged due to a lack of oxygen. further, if a large piece of plaque buildup gets dislodged from an artery wall, it can get stuck in other arteries throughout the body, including arteries in the brain. for simplicity, let's assume that the artery is cylindrical with a radius of r. the flow rate of a viscous fluid is given by poiseuille's law q=(π/8)(δp/ηl)r4.
How does artificial selection differ from natural selection?
Natural selection is a nature-made selection, and artificial selection is a man-made selection. Natural selection is the work of nature itself and no human interaction is involve in this process. Plants and animals breed according to the flow of nature. While on the other hand artificial selection produces diversities of organisms such as improved crops and livestock.
Why is research and development an integral part of the designing and producing process of an aerospace product?
Final answer:
Research and development (R&D) is essential in aerospace design and production due to the necessity for safety, efficiency, and continual innovation in complex systems such as airplanes, helicopters, and satellites. R&D efforts drive product and process improvements, leading to cost reductions and economic-wide benefits. Examples like HighFlyer Airlines illustrate the need for R&D in realizing specific design goals that can enhance profitability and passenger comfort.
Explanation:
Research and development (R&D) is an integral part of the designing and producing process of an aerospace product due to the industry's high stakes in safety, efficiency, innovation, and competition. The need for scientific research and continuous improvement is relentless, as it contributes to developing new products, technologies, or processes that can significantly enhance productivity and societal welfare. Aerospace products, such as airplanes, helicopters, rockets, satellites, and space shuttles, are complex systems that rely on cutting-edge technology and optimized design for their operation.
Aerospace engineers apply their knowledge of physics, math, and engineering to tackle challenges like designing safer, more comfortable, and efficient commercial aircraft. The role of R&D extends to both product development—creating new products and improving existing ones—and process development, which involves streamlining operations and manufacturing methods to reduce production costs. The dynamic and uncertain future of technology further emphasizes the criticality of R&D investments in positioning firms for success.
What is the steady state of contraction created by smooth muscle
Final answer:
The steady state of contraction in smooth muscle is known as muscle tone, maintained with minimal energy thanks to latch-bridges. Factors like the autonomic nervous system and stretching can influence these contractions. Smooth muscle is categorized into single-unit and multiunit types, with single-unit being more common in organ walls.
Explanation:
The steady state of contraction created by smooth muscle is referred to as muscle "tone". This muscle tone is a low-level contraction that can be maintained for long periods with little energy expenditure. Smooth muscle achieves this through the use of latch-bridges, a type of cross-bridge that can remain attached between myosin heads and actin filaments without the continuous need for ATP.
Smooth muscle contraction can be induced or modulated by various factors, such as neural stimulation by the autonomic nervous system (ANS), hormones, local factors, and physical stretching of the muscle fibers. The stress-relaxation response is characteristic of visceral smooth muscle, allowing organs such as the stomach and bladder to stretch and contract efficiently without premature emptying.
This muscle type can be categorized as single-unit and multiunit. Single-unit smooth muscle contains gap junctions that synchronize contractions, making the muscle contract as a single unit. This type is mostly found in the walls of viscera. On the other hand, multiunit smooth muscle cells lack gap junctions and their contractions are not synchronized, allowing for fine control and are found in structures such as the large airways to the lungs and the large arteries.
identify one factor that could affect which color trait is selected for in a particular environment
15) Which type of molecule makes up the double layer of a cell membrane? A) carbohydrate B) lipid C) nucleic acid D) protein
Answer:
B) lipid is the correct answer.
Explanation:
The cell is made up of a bilayer of phospholipids which is a type of lipid.
Phospholipids are the abundant kind of lipid located in the cell membrane.
The lipid double layer is a common component of all cell membranes.
It is composed of two components, a hydrophilic head, and a hydrophobic tail.
The hydrophilic head is composed of phosphate and glycerol.
The hydrophobic tail is composed of fatty acids.
Thus lipid type of molecule makes up the double layer of a cell membrane.
Answer:
c llipids
Explanation:
What macromolecule makes up the double layer of cell membranes?
What macromolecule makes up the double layer of cell membranes?
Proteins
Carbohydrates
Lipids
Nucleic Acids
All cells contain a phosphate buffer system within their internal fluid to help maintain a constant pH. This system can be summarized by the following chemical equation: H2PO4- (aq) H+ (aq) + HPO4-2 (aq) This system mostly contributes to which of the following cellular activities?
A.
maintaining homeostasis
B.
reproduction
C.
acquiring energy
D.
natural selection
The phosphate buffer system is essential for maintaining homeostasis by regulating the pH within cells, ensuring optimal functioning of the body.
The phosphate buffer system within cells plays a critical role in maintaining homeostasis by regulating the acid-base balance and ensuring a stable internal pH. The chemical equation H₂PO₄₋ (aq) H+ (aq) + HPO4₂₋ (aq) represents this buffer system, which is more active intracellularly and maintains a pH of 6.86. It is essential for proper physiological functioning, as it prevents a radical change in fluid pH by absorbing excess hydrogen or hydroxyl ions. This system is particularly vital since all body cells depend on a tightly regulated pH level to function correctly.
Which other system in the body works closely with the kidneys to regulate arterial blood ph?
The correct answer is the respiratory system.
The pH of the extracellular fluids (blood) can be controlled by separately regulating the partial pressure of CO2, which determines the carbonic acid concentration via respiration and the bicarbonate ion concentration in the extracellular fluids via renal system. Control of the carbonic acid concentration in the blood is achieved by changes in the rate and depth of breathing. Breathing releases or retains CO2 (and thus carbonic acid) in the blood plasma and thus, changes its pH.
After replication, ____ identical molecules of _____ are produced. A gene is a sequence of _____ in a molecule.
What was Gregor Mendel’s main contribution to science? A. He cultivated unusual flower species. B. He is considered the father of genetics. C. He researched the best-tasting peas. D. He proposed a theory of blended traits.
Gregor Mendel’s proposed the theory of blended traits which is considered as main contribution to science.
Answer: Option D
Explanation:
He experimented with the seven contrasting traits of the pea plant and came up with theories and laws pertaining to the segregation of characters. He noted that the F2 generation of the pea plant was having traits which were composed of dominant, recessive as well as new trait due to co-dominance.
How do wetlands abiotically help to protect the water quality of a marine ecosystem? They cause areas to flood into larger water bodies. They cause the water to be filled with tannins. They filter sediments and other material from runoff. They prevent water from being stored in their areas.
Answer: They filter sediments and other material from runoff.
Explanation:
A piece of land covered by water is known as a wetland. Some examples are marshes, ponds, deltas etc.The wetlands abiotically help them to protect the water quality of the marine ecosystem by filtering the sediments that are present in the surface runoff as well as by absorbing many of the harmful pollutants present in it. In this way, they prevent them from reaching the marine water bodies. Thus, the wetlands act as nature's cleansers or filters.The head of a giraffe is 2.0 m above its heart and the density of the blood is 1.05 103 kg/m3. what is the difference in pressure between the giraffe's heart and head? (fortunately, a giraffe's neck has a special circulatory system to adapt to this neck length, producing an even flow of blood to the head.)
The difference in pressure between the giraffe's heart and head is :
20.58 kPa Position of Giraffe head in relation to its heartGiven that the head of the giraffe head is placed at a higher position the blood pressure in the head will be higher than the blood pressure in the heart. and
Pressure in the Giraffe is directly related to ; density , gravity and height of the giraffe
Therefore pressure = ρ*g*h
= 1.05 * 10³ * 9.8 * 2
= 20580 pa = 20.58 kPa
Hence we can conclude that the difference in pressure between the giraffe's heart and head is 20.58 kPa.
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Which of the following can be cofactors?
organic molecules
inorganic molecules
anions
cations
Answer:
The correct options are: organic molecules and cations
Explanation:
Cofactors are the non-protein ions or molecules that combine with the inactive enzyme, called the apoenzyme to form the holoenzyme.
Cofactors can be classified into two categories: 1. the inorganic ions or the metal ions and 2. the coenzymes.
Coenzymes are the complex organic molecules that are of two types: 1. the cosubstrate; 2. prosthetic group
Therefore, Cofactors can be either inorganic metal ions or organic molecules.
What three lifestyle factors decrease the risk of cardiovascular disease development?
Dinobryon is a species of protozoa that reproduces asexually. How can this asexual reproduction be harmful to the species?
cells that perform a specific function in an organism
Answer:
Cells that perform a specific function:Cell serves as the basic building blocks for building the structure or the body of the living organisms. Now, certain type or specific number of cells come closer and arrange themselves in such a sequence that they need to perform a unique or specific task by making up a whole organ structure.
Explanation:
Example of cells that perform the specific function inside the living organisms body:There are certain cells inside the human body which makes up a single organ and then performs the whole function specifically by themselves, as we have the "myocardial myocytes". These are the specific type of cells which are required for the heart's cardiac muscles to develop or grow in a given pattern. As these cells are specialized for making up or building up of the cardiac muscles which in turns results in the heart structure. And performs the basic function of supply of blood and the required materials i.e nutrients to the different cells and organs.
How would a sudden decrease in the rabbit population on an island affect another species there? *
A. The population of eagles would probably increase.
B. The population of ladybugs would probably increase.
C. The population of blue jays would probably decrease.
D. The population of foxes would probably decrease.
The correct answer is option D The population of foxes would probably decrease.
A food chain can be defined as a linear sequence of organisms through which the nutrients and energy flow as one organisms feeds on the other. Each level of the food chain is called the trophic level. They show organisms starting from the producers and end with consumers or sometimes with detrivores or decomposers. The producers which use solar energy and prepare their food occupy the first trophic level, followed by the primary, secondary, tertiary, quaternary consumers occupying the next trophic level.
In the terrestrial food chain given above, grass → rabbit → fox, the decrease in the any population will effect the other organism at a different trophic level of the food chain. A sudden decrease in the population of rabbits will decrease the population of the foxes at the next trophic level as it is a secondary consumer feeding on the primary consumer which is the rabbit. So, a sudden decrease in the rabbit population will starve the foxes and thus decrease their number in the island.
________ disease involves the heart, peripheral vascular system and brain while_______ disease involves the eyes kidney, and large blood vessels.
Cardiovascular disease affects the heart, peripheral vascular system, and brain, while diabetic retinopathy often impacts the eyes and kidneys, alongside large blood vessels.
Cardiovascular disease is a class of diseases that involve the cardiovascular system, including diseases of the coronary arteries, carotid arteries, and peripheral arteries. It is known as the leading cause of death worldwide. Conditions like hypertension and atherosclerosis are common causes of cardiovascular diseases, which can lead to stroke and peripheral artery disease.
We know that vinyl chloride is a carcinogen. parents fear that their children will get cancer from playing with toys made from pvc. do you agree or disagree?
_____ is the correct cpt code for a cholecystectomy using a right subcostal incision for exploration of common duct, with choledochoenterostomy.
47612
A current Procedural Terminology (CPT) code is a medical code that describes or emphasize precisely on the service a health care provider has performed for a patient. CPT describes medical, surgical, and diagnostic services and it also help to pass uniform information about medical services among health workers and patients.
The correct CPT code for a cholecystectomy using a right subcostal incision for exploration of common duct, with choledochoenterostomy is 47760. This code signifies the cholecystectomy is performed with an exploration of common duct and a choledochoenterostomy.
Explanation:The CPT (Current Procedural Terminology) code that matches the description of a cholecystectomy via a right subcostal incision for exploration of the common duct with a choledochoenterostomy is 47760. This code signifies that the cholecystectomy is performed with an exploration of the common duct, and a choledochoenterostomy, which refers to the surgical creation of a connection between the common bile duct and a part of the digestive tract.
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Number of chromosomes in gametes when meiosis occurs normally
16. In some species of balloon flies, males spin balloons of silk and carry them while flying. If a female approaches one of the males and accepts his balloon, the two will fly off to mate. This type of behavior is an example of (1 point) aggression. territorial defense. courtship. language.
The right option is Courtship
Courtship is a behavior in which different
species interact and select their partners for mating which leads to
reproduction. Most times, the female specie chooses the desired male to mate with before
copulation. Various behaviours such as display
of strength, dancing and vocal utterance are often used during courtship. For the question given above,the type of behavior displayed by the species of balloon flies is an example of courtship.
The right option is Courtship
Courtship is a behavior in which different
species interact and select their partners for mating which leads to
reproduction. Most times, the female specie chooses the desired male to mate with before
copulation. Various behaviours such as display
of strength, dancing and vocal utterance are often used during courtship. For the question given above,the type of behavior displayed by the species of balloon flies is an example of courtship. yw dawg
Please list from greatest to smallest
In ________, the interaction between two species harms both of them. coevolution competition mutualism parasitism symbiosis
how are proteins built using the information provided by a molecule of RNA ?
During translation, the information to build the RNA comes from messenger RNA (mRNA)
Answer:
RNA determines the sequence of amino acids in proteins and polypeptides by a two-step process: transcription of DNA produces mRNA in the nucleus, then translation of the mRNA to tRNA takes place in the ribosome in the cytoplasm.
What does the author mean when he refers to reverse engineering the brain?
a.studying brain activity by observing a person's actions
b.studying the electrical impulses of the brain and then comparing them to an average circuit board
c.studying the workings of the brain by disassembling its components and then reassembling them
d.studying the anatomic structure from the back of the brain to the front?
In this phase, chromosomes arrive at the poles and a nuclear envelope begins the develop around them:
what chemical compound is crucial to marine life and how it is disappearing
The answer is nitrogen. It is usually regarded as a growth-limiting factor for primary producers such as phytoplankton. It is usually taken up in the ‘fixed’ form of ammonium. It is converted from dissolved nitrogen gas in ocean surface to a ‘fixed’ form by particular microbes. Due to increasing global temperatures, as a result of global warming, the ocean temperatures have increased hence oceans hold less dissolved oxygen than they used to. The low oxygen concentration in the oceans induces the loss of nitrogen from oceans through increased activity of micro-organisms that are significant in denitrification. This rate becomes higher than that of nitrification that fixes nitrogen in the oceans.