Answer:
(D). RNAi allows scientists to turn off one gene specifically to study its effect.
Explanation:
RNAi (RNA interference) can be defined as a process, which involves inhibition of gene expression by degrading the targeted mRNA molecules. This technique is widely used in laboratories to study the functions of different genes by targeting them.
For this, a dsRNA molecule is formed having a sequence complementary to target gene and introduced into the cell or organism. This RNA is recognized as exogenous RNA and triggers activation of RNAi pathway.
RNAi pathway leads to a significant decrease in expression of a target gene. Hence, physiological role of the targeted gene product can be check by studying the effect of decrease in its expression.
Thus, the correct answer is option (D).
Answer:
The Answer is option D
Explanation:
who discovered cell ? and when it was discovered?
Answer:
Robert Hooke in 1665
Answer: Robert Hooke
Explanation: Robert Hooke discovered the cell, the basic structural, functional, and biological unit of organisms, in 1665... PF
18. In replication of DNA, the helix is opened and what is unzipped?
A. Nitrogen bond
C. Oxygen bond
B. Hydrogen bond D. Phosphate bond
Answer:
B) Hydrogen Bond
Explanation:
Those are the bonds that the restrictive enzymes unzip and the bonds that hold the complementary bases.
Final answer:
In DNA replication, helicases unzip the DNA molecule by breaking the hydrogen bonds between the nitrogenous base pairs.
Explanation:
DNA replication is a process that involves the unzipping of the DNA molecule. During this process, enzymes known as helicases break the hydrogen bonds between nitrogenous base pairs. This action separates the two strands of the DNA double helix and allows each strand to serve as a template for the creation of a new complementary strand. Consequently, the letter corresponding to the correct answer is B. Hydrogen bonds between complementary bases break during the replication of DNA.
Why can two igneous rocks have the same minerals but different names?
-The rocks may have different textures.
-The rocks may be of different sizes.
-The rocks may have different colors.
-The rocks may be found in different areas.
Answer:
The rocks may have different textures
Explanation:
If we have to igneous rocks, and they have the same minerals, that doesn't necessarily means that they will have the same name, thus being classified as the same rock. The reason for this is that the two igneous rocks may have a different texture. One of the rocks may have a foliated, while the other may have porphyritic, giving them different appearance despite the same minerals being in both of them. The reason why two igneous rocks with the same minerlas may appear different, is the process in which they have been formed, the quickness of the cooling, the temperature that they were exposed to, and the pressure they were exposed to.
Answer:
they have different textures
Explanation:
What is responsible for the uneven heating that drives wind and ocean
currents from day to day?
O
A. Earth's tilt
O
B. Microclimates
O
C. Precession
O
D. Earth's revolution
Answer:
A
Explanation:
The earth is tilted at an average of 23.5 degrees. This means that in some seasons, the north pole is tilted towards the sun and in some seasons it is tilted away from the sun. The sun seems to vary in position over an year as the earth revolves around the star. The sun, therefore, variably and differentially heats the regions of the earth. The regions that are heated more form low-pressure system that drives winds.
the answer is , earth's tilt.
Which unit of geologic time is the oldest?
Answer:
Precambrian Era
Explanation:
When did oxygen levels start to decline from 35 percent down to today's levels during what period
about 95 million years ago, during the Carboniferous Period
Answer:
During Carboniferous period, part of the late Paleozoic era.
Explanation:
In the geological story oxygen levels have been relatively stable for the las 200 million of years, but 300 million ago there was a dramatic spike in Oxygen levels until 35% in the Carboniferous , next it plunged in 15 percent in the Triassic, 100 million years later. The growth of the forests removed huge amounts of carbon dioxide from the atmosphere, leading to a surplus of oxygen. The higher oxygen concentration is related with the presence of larger bodies in reptile and insects.
What best describes the blood flowing in an artery
Answer: It moves away from the heart.
Explanation:
The cardiovascular system delivers oxygen and nutrients to all the cells of the body. It consists of blood vessels and heart. The blood vessels runs through the entire body. The arteries have the role that carry blood away from the heart whereas the veins carry the blood back to the heart. The arteries distribute the blood through the heart to all the parts of the body including the tissues and body organs.
Answer: it is oxygen rich
Explanation:
Experiments in which all variables are identical except for one are called _____ experiments
Answer:
Controlled experiments
Explanation:
Controlled experiments are those experiments where all variables are identical but only one is different. The purpose of such experiments is to test a hypothesis by analyzing the change it brings to results due to change of only one variable when everything else is constant. SO we can say that in such experiments, it is the only changing variable which is influencing the results of an experiment because everything else is just same.
Hope it helps!
The purpose of a vortex instrument is to
Answer:
The vortex created is a similar form of kinetic force to stirring, but minus a component that protrudes into the sample container. A vortex is the preferred choice for a host of microbiology and life science applications with sensitive samples or high throughput operations. A typical stirrer faces several limitations – for instance, it can only mix a single sample container at a time.
Answer:
Vortex instrument is used to suspend cells that is, it is a simple device used to mix small vials of liquid in laboratories.
which consumers live in the open ocean
Answer: swordfish, dolphins, and sharks
Explanation: Consumers must eat other consumers or producers to survive in the open ocean. Out of the provided answer choices, swordfish, dolphins, and sharks all prey on producers or other consumers to eat.
In the oceanic zone, primary consumers include plankton, with larger predators like whales and dolphins feeding on them. Nutrients are scarce, and the food web complexity decreases with depth. Overfishing has significantly impacted populations of large fish and marine mammals.
Explanation:The open ocean, also known as the oceanic zone, is a marine biome characterized by thermal stratification where warm and cold waters mix due to ocean currents. This zone hosts a variety of consumers, including plankton, which form the base of the food chain, and larger animals such as whales and dolphins that feed on them. Due to the scarcity of nutrients, the oceanic zone is less productive compared to coastal regions. Nonetheless, it supports a diverse array of life forms adapted to this environment.
Photosynthetic organisms are predominantly found in the upper layers where sunlight penetrates, forming the basis for the food chain. When these organisms die, they fall to the ocean floor, providing nutrients for bottom-dwelling creatures in the aphotic zone, such as sea cucumbers. Notable is the absence of a mechanism to recycle nutrients back to the surface in the open ocean, except in areas of upwelling.
Over-exploitation and certain fishing practices have led to dramatic declines in the populations of large fish and marine mammals, which are key components in the ocean's complex food webs.
Which type of fatty acid would result in a lipid that is the most liquid?
A. Cis polyunsaturated
B. Trans polyunsaturated
C. Monounsaturated
D. Saturated
Monounsaturated fatty acid would result in a lipid that is the most liquid.
They start to harden when chilled. Saturated fats and trans fats are solid at room temperatureWhy are monounsaturated fat liquid at room temperature?It is because of the kinks in the hydrocarbon tails, unsaturated fats can't pack as closely together, making them liquid at room temperature.
Which fats are healthy?Monounsaturated fats and polyunsaturated fats are known as the good fats because they are good for heart, cholesterol, and overall health.
These fats can help to:
Lower the risk of heart disease and stroke.Lower bad LDL cholesterol levels, while increasing good HDL.Prevent abnormal heart rhythms.Lower triglycerides associated with heart disease and fight inflammation.Lower blood pressure.Prevent atherosclerosisHence, C option is correct.
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Final answer:
A. Cis polyunsaturated fatty acids lead to the most liquid lipids because their kinked shapes prevent tight packing, making them fluid at room temperature.
Explanation:
The type of fatty acid that would result in a lipid that is the most liquid is A. Cis polyunsaturated. This is because cis polyunsaturated fatty acids have kinked shapes due to the presence of multiple cis double bonds, which prevent them from packing tightly together, thereby lowering their melting point. As a result, lipids composed of cis polyunsaturated fatty acids are more fluid and remain in a liquid state at room temperature compared to their saturated, trans polyunsaturated, and monounsaturated counterparts. Examples of these fatty acids include saturated fatty acid (e.g., stearic acid), polyunsaturated fatty acid (e.g., linoleic acid), and monounsaturated fatty acid (e.g., oleic acid).
What are the end products of the light-dependent reactions that need the presence of light to occur?
The end products of the light-dependent reactions, which require light to occur, are ATP and NADPH. These molecules are then used to power the light-independent reactions (Calvin Cycle) where glucose is synthesized.
The light-dependent reactions of photosynthesis are the initial phase where light energy is converted into chemical energy. Specifically, these reactions take place in the thylakoid membranes located within the chloroplasts. The primary function of the light-dependent reactions is to produce energy-rich molecules, which are ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). These molecules are essential to power the subsequent process, known as the light-independent reactions or the Calvin Cycle.
The overall summary of the light-dependent reactions can be represented as:
12 H₂O + 12 NADP⁺ + 18 ADP + 18 [tex]P_i[/tex] + light → 6 O₂ + 12 NADPH + 18 ATP
In essence, water (H₂O) is split in the presence of light, releasing oxygen (O₂), which is a by-product. The main products, ATP and NADPH, are then utilized in the light-independent reactions to synthesize glucose and other carbohydrates from carbon dioxide (CO₂) and water (H₂O).
scientists discovered that new molten materials from inside the eath create new
Answer:
Crust
Explanation:
According to the recently given theory, The theory of Seafloor Spreading the magma or lower most part of the earth's surface which sometimes bursts as (molten lava) plays substantial role in the formation of new crust. This is because when magma or molten lava from the bottom most part of the earth reaches the surface of earth, it cools down and pushes the already existing surface of the earth like rocks from both directions. This pushing of rocks cause the formation of new crust by the molten materials when it cools down.
Hope it helps!
Answer:
crust and younger
Explanation:
Diastolic describes a measurement of which of the following
Answer:
diastolic is the pressure when the heart relaxes and lets the chambers fill up with blood
Explanation:
Answer:
diastolic is the pressure when the heart relaxes and lets the chambers fill up with blood
Explanation:
which fossil fuel is in greatest supply worldwide
Answer:
i think its gas for cars and stuff
Plants absorb nitrogen from: the atmosphere the soil water
Answer:
Plants absorb nitrogen from: the soil ( second choice)
ANSWER:
Plants absorb nitrogen from the soil.
EXPLANATION:
Nitrogen is absorbed by the roots of the plants in the form of amino acids, nitrate or nitrite ions. The nitrogen absorbed from the soil by roots is then transported to the various parts of the plants. Plants do not get nitrogen they need directly from the air. This is because the organic nitrogen that is available in the atmosphere is not usable for plants. Plants need non-organic nitrogen which is obtained by changing organic nitrogen into non-organic forms by the bacteria in the soil.Earth’s view from space is like a sparkling blue oasis in a black sea of stars. True Or False
Answer:
True. Since the amount of ocean we have on the planet is 75%, be mostly just see blue when looking at the Earth.
Answer: True
Explanation:
The view of Earth from the space is like a sparkling blue oasis in a black sea this is because the maximum part of the earth is covered with water which constitutes to about 75%.
Rest of the 25% is the land area which appears to b blackish brown in color. The space from where the earth is being seen is very far so it appears like this.
From that 75% only some part is freshwater source which is used by the human beings for its consumption but rest of the water is ocean and marine water which is not suitable for consumption.
HELP!! Fossil evidence has been used to understand the movement of continental plates. The figure below shows where fossils of several species have been found. How would the range of modern organisms today compare to these species?
Answer:
C
Explanation:
With continental drift separating Pangea, we know that A and D must be false because they are farther apart today not closer. Between answer choices B and C, many of the species shown appear to have inhabited Antartica, and hardly anything lives there today. This leaves C as the most logical answer.
Answer:
The answer is C - More modern species would have a smaller range because the plates are farther apart today.
Explanation:
Which of the following correctly compares steroid and nonsteroid hormones
Answer:
do post complete question
A steroid hormone is a steroid that acts as a hormone. Steroid hormones can be grouped into two classes: corticosteroids and sex steroids. Within those two classes are five types according to the receptors to which they bind: glucocorticoids, mineralocorticoids, androgens, estrogens, and progestogens.
Nonsteroid hormones (water soluble) do not enter the cell but bind to plasma membrane receptors, generating a chemical signal (second messenger) inside the target cell. Five different second messenger chemicals, including cyclic AMP have been identified. ... The action of nonsteroid hormones.
The decaying plat matter found in bogs results in the production of
Answer:
Peat
Explanation:
The decaying plant matter that is found in bogs results in the production of peat. It is not fully decayed by either acidic or inorganic environmental conditions, rather present or composed of wet-land plant life. it is rich in carbon dioxide. It is also an important source of fuel.
Answer: carbonic acid
Explanation:
Check all the characteristics below that describe ATP.
Check all that apply.
stands for "adenosine triphosphate" is an energy molecule
contains two phosphates
contains energy in phosphate bonds
Answer: Option A, B and D are correct.
Explanation:
ATP or adenosine triphosphate can be defined as the high energy molecules that is used by all the living organism.
This molecule is released by the combustion of carbohydrates in the presence of oxygen.
The energy is stored in the phosphate bonds and adenosine triphosphate contains 3 phosphate molecules.
Answer:
A- Stands for “adenosine triphosphate”
B- Is an energy molecule
D- Contains energy in phosphate bonds
- I'm doing the assignment mate, no cap
To visualize the structure of DNA, which has a width of 10 nm, which microscope would be best
Answer:
Electron microscope
Explanation:
Instead of using light, it utilized a beam of electron for illumination. Because an electron beam has a shorter wavelength than light (up to 100, 000 times shorter), they have a higher resolution power and are therefore able to view sub-cellular structures including DNA.
Answer:
The answer is: Electron microscope.
Explanation:
To obtain the maximum magnification and the best resolution, the electron microscope must be used, which can reveal details of up to a few nanometers (nm).
When the thin cuts are sectioned, stained and observed with the electron microscope, a delicate membrane, about 5 nm thick, that surrounds the cell is visualized.
The answer is: Electron microscope.
How do meiosis I and mitosis similar?
Answer: they are both about cell division, (both involved in making new cells)
Explanation:
The branch of Earth science that focuses on objects beyond Earth's atmosphere is
A. astronomy.
B. oceanography.
C. geology.
D. meteorology.
Answer:
A.
Explanation:
because it studies the key word Astro which means astrophysics which is stars good luck
Two species of guppies show different mating behaviors is it prezygotic or postzygotic isolation
Answer:
Prezygotic
Explanation:
Prezygotic means that the two species cannot reproduce a viable offspring before the two zygotes meet. Since behaivoral isolation is listed under being prezygotic because behaivors prevent their intercourse before the zygotes meet, then it is prezygotic.
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Which statements describe the functions of DNA? Check all that apply.
DNA destroys bacteria and viruses that cause sicknesses in organisms.
A. DNA plays a role in the growth and reproduction of organisms.
B. DNA stores energy for the organism to use in the future when food is scarce.
C. DNA guides the formation of an organism's structures.
D. DNA helps organisms function by telling them how to function.
Answer:
DNA plays a role in the growth and reproduction of organisms.
DNA guides the formation of an organism’s structures.
DNA helps organisms function by telling them how to function.
Answer:
b,d,e
Explanation:
How do you calculate a scale for your drawing when using a microscope?
A. Size of drawing / size of organism
B. Field of view / size of drawing
C. Size of organism x size of drawing
D. Magnification / size of drawing
Answer:
D. Magnification / size of drawing
Explanation:
You would calculate a scale for your drawing when using a microscope by magnification / size of drawing.
Jasmine, at 33 months of age, is able to engage in some self-care behaviors but still has trouble with tasks such as putting on socks. A few months later, she accomplishes this same task relatively easily. The change in abilities is most likely due to _____.
Answer:
Developmental progression of functional skills
Explanation:
With the passage of time, a kid not only grows physically and mentally but also in his/ her cognitive abilities to perceive and understand the happening around him. He develops a a relationship sense for peers, family members and related adults. Similarly, he also develops the ability to learn the things which are quite basic for us like taking off clothing items.
These things come under the umbrella of developmental progression for functional skills. studies have shown that a kid learns to take off clothing items before he learns to put them on. Same is the case with putting on socks, a kid can take off socks by the age of 12 months which is earlier than he learns to put them off (age of 18 months) with the assistance of any elder and independently by the age of almost 4 years.
This developmental progression helps a kid to modify his behavior and to be more independent.
Hope it helps!
The change in Jasmine's abilities, progressing from struggling with tasks like putting on socks at 33 months to accomplishing them relatively easily a few months later, is most likely due to:
A. fine motor skills.
As Jasmine grows and her fine motor skills develop, she becomes more adept at tasks like putting on socks, demonstrating improved coordination and control over her movements. This developmental progression allows her to accomplish previously challenging tasks with greater ease and proficiency.
The change in Jasmine's abilities, progressing from struggling with tasks like putting on socks at 33 months to accomplishing them relatively easily a few months later, is most likely due to her developing fine motor skills. At 33 months, children are still refining their coordination and dexterity, making tasks like putting on socks challenging. However, with continued practice and maturation, Jasmine's fine motor skills improve, allowing her to perform tasks requiring precise hand movements more effectively. This developmental progression is typical as children grow, and their neurological pathways strengthen. The newfound ability to put on socks relatively easily demonstrates Jasmine's enhanced fine motor control and highlights the importance of developmental milestones in acquiring self-care abilities.
The correct question is:
Jasmine, at 33 months of age, is able to engage in some self-care behaviors but still has trouble with tasks such as putting on socks. A few months later, she accomplishes this same task relatively easily. The change in abilities is most likely due to _____.
A. fine motor skils.
B. a non-supportive environment.
C. a lack of motivation.
D. poor language abillies.
What factors are most important when deciding what information to use?
A. It must agree with your ideas and be from secondary data.
B. It must agree with your ideas and be reliable.
C. It must be unbiased and verifiable.
D. It must be verifiable and from primary data.
C is the correct answer.
the information must always be verifiable, but it can still be secondary data rather than primary.
Answer: C. It must be unbiased and verifiable.
Explanation:
The information which is unbiased and verifiable can be considered as most important when deciding it's use. This is because of the fact that the biased information may be generated by manipulation, can be inaccurate or unreliable. The information should be verifiable which means it can be rectified using several sources and experimental trials.
(2.08x10^3) x (3.11x10^2)
Answer:
646,880
Explanation:
Start with your exponents.
[tex](2.08*10^3)*(3.11*10^2)\\(2.08*1000)*(3.11*100)[/tex]
Next, multiply within your parentheses.
[tex](2.08*1000)*(3.11*100)\\2080*311[/tex]
Finally, multiply your two terms against each other.
[tex]2080*311\\646880[/tex]