Answer:Question:
A cell is placed into a beaker containing a
4
%
sucrose solution. The cell contains a
1
%
sucrose solution. Was the cell placed in a hypotonic, hypertonic, or isotonic solution? Will there be a net influx or efflux of water and if so what direction?
Concentration Gradients
The rate and direction of diffusion, and osmosis is dictated by the extent of concentration gradients present between two solutions. Organisms take advantage of concentration gradients to transport molecules, transfer heat, etc.
Explanation:
Which is not part of a myofibril?A) Muscle cellB) SarcomeresC) MyosinD) Actin
Answer:
A) Muscle cell
Explanation:
The myofibril has the following parts, sarcomeres, actin, myosin etc...
The part that is NOT part of a myofibril is Muscle cell, but it does have a muscle fiber.
Using the drop-down menus, identify the structures common to all cells.
The 3 Basic Components of the Cell Theory were then complete:
The 3 postulates of the Cell Theory are:
-Every living being is composed of cells, therefore they are the minimal functional unit of life, in their different levels of structural complexity. One single
cell is enough to make up an organism, but also multiple cells can organize in colonies or in a single organism, diversifying their functions and having a margin of independence quite elevated as a whole.
-All of the vital functions of living organisms have a place inside the cell, through biochemical processes and are controlled by substances that the cell secrete. Each cell operates as a unique open system, that exchanges matter, and energy with its environment in a controlled way. Moreover, in each cell of an organism are present the same vital functions that are in the organism itself, that is birth, growth, reproduction, and death.
-Every existing cell comes from a previous cell, by cell division, or by formation from stem cells.
3. How might the changes that you identified affect the protein’s structure?Example: The change would likely have no effect. Neither valine and isoleucine would promote hydrogen bonding with water, because their R groups are nonpolar and thus hydrophobic.Changes spotted in the previous question:1. Valine changed for Isoleucine: there was not a change in the chemical properties, because both amino acids have non-polar chains2. Valine changed for Alanine: there was not a change in the chemical properties, because both amino acids have non-polar chains3. Glutamate changed for Alanine: there was a change because the aminoacidic chain lost their electronegativity4. Glutamate changed for Aspartate: there was not a change because the aminoacidic chain kept it's electronegativity.1) _______________________________________________________________2) _______________________________________________________________3) _______________________________________________________________4) _______________________________________________________________
In the previous exercise we spotted that in the sequences there were at least four changes in the aminoacidic sequences:
1. Valine changed for Isoleucine: as indicated by the very exercise, there wouldn't be a negative effect, because both amino acids have hydrophobic radical groups.
2. Valine changed for Alanine: like in the previous case, there wouldn't be a negative effect, because both amino acids have hydrophobic radical groups.
3. Glutamate changed for Alanine: there would be a change in the protein structure because Glutamate can form hydrogen bonds, and Alanine doesn't.
4. Glutamate changed for Aspartate: there wouldn't be a change in the protein structure because both amino acids can form hydrogen bonds.
Create a phylogenetic tree of the major groups of plants using green algae as the outgroup. You should include angiosperms, gymnosperms, ferns and their allies, and bryophytes making sure to provide characters on the tree indicating why lineages separated where they did.
In this case, we have the major groups of plants, many characters have defined the appearance of each group however there are some traits that are too important and those are mentioned here.
In the base is algae, when the retention of the Zygote occurs plants started to evolve when plants started to evolve in earth bryophyte came to be, however they do not possess a proper vascular system, this occurred with pteridophytes (ferns and so forth), nonetheless still produced spores, angiosperms reduced gametes and pollen came as innovation, however, they produced strobili, so the innovation of angiosperms were flowers.
Why does the body need iron ? a. Stimulates formation of of lymph b. Forms part of hemoglobin c. Prevents destruction of red blood cells d. prevent the plaque formation in arteries
The body need iron because it is a major component of hemoglobin, an important cell for the organisms that carries oxygen from the lungs to all the parts of the body, without iron the number of hemoglobin is not enough to transport oxygen and the organism can be lead to fatigue. Therefore, the correct alternative is B. forms part of hemoglobin.
Finish the DNA strand using
complementary base pairing rules.
A-G-T-C-T-G-C
Answer:
T-C-A-G-A-C-G
Explanation:
Although animal nervous systems differ in complexity, their nerve cells are still remarkably similar
a. True
b. False
It is true that, Despite the fact that the complexity of animal nervous systems varies, their nerve cells are still remarkably similar.
Nearly all multicellular animals have nerve systems, but their complexity varies greatly. Sponge and the tiny blob-like placozoan and mesozoan organisms are the only multicellular animals without a nervous system. A diffuse nerve net makes up the nervous systems of ctenophores (comb jellies) and cnidarians (such as anemones, hydras, corals, and jellyfish). With the exception of echinoderms and a few worm species, all other animals have a nervous system that includes a brain, a central cord (or two parallel cords), and nerves that radiate from the brain and central cord.
The nervous system's most fundamental roles are to direct an organism's movement and to influence its surroundings (such as through pheromones). Signals are sent from one cell to another or from one part of the body to another to accomplish this. Signals that travel to muscle cells trigger the activation of muscles and signals that travel to endocrine cells triggers the release of hormones into the bloodstream or other internal fluids are the sources of the output that the nervous system produces.
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What are three types of freshwater wetlands?
Freshwater wetlands are ecosystem affected by inundation (permanently or temporary). The three major types are swamps (uncultivated low-lying ground where water collects), marshes (low-lying and waterlogged land, flooded in wet seasons or at high tide) and bogs (wet muddy ground that's too soft to support a heavy body).
6. Cilia and flagella are used to move substances along the surface of the cell instationary cells. Which of the following is another function of cilia and flagella?A. They hold neighboring cells in a fixed position.B. They move cells through watery environments.C. They transmit waste materials away from the cell.
Cilia and flagella are structures present in the cells that can be used for movement in aqueous media, such as in the case of spermatozoa (flagellum) and Paramecium (cilia).
This means B, they move cells through watery environments, is the right answer.
Identify the neurons that are nerve cells that carry information between sensory and motor neuronsOptions Sensory neurons Interneurons Motor neurons
Interneurons are responsible for connecting sensor neurons and motor neurons by transferring signals and communicating with each other.
Mr. Cantrell's science class is conducting an investigation to observe the differences between plant and animal cell organelles. The students will observe an onion cell under one microscope, and an animal cell under another microscope. What should students observe as being similar in the onion cell slide and the animal cell slide?
A. Both cell types have a nucleus.
B. Both cell types have a rigid cell wall.
C. Both cell types have large vacuoles.
As you have seen, in bright light, the rate of photosynthesis is greater than the rate of cellular respiration. How does a plant use the sugar molecules produced by photosynthesis that are not used for cellular respiration?
Cells need energy in order to perform most cellular processes. This energy is produced throughthe process of cellular respiration. Which of the following describes this process.A. water is transported into the cell to create ATP.B. sugar molecules are broken down to produce ATP.C. light is captured and used to build sugar molecules.D. carbon dioxide molecules are combined to create protein molecules.
The correct answer is B. sugar molecules are broken down to produce ATP. In cellular respiration sugars are broken down. During the process, they release energy that allows the cell to produce ATP.
True or False: Blood sugar would be lower than normal if the liver continually converted sugars into carbohydrates regardless of the amount of insulin circulating in the blood.
Blood sugar would be lower than normal if the liver continually converted sugars into carbohydrates regardless of the amount of insulin circulating in the blood is a true statement.
What is insulin?
This is referred to as a type of hormone which is secreted by the organ known as pancreas and is responsible for the regulation of glucose content in the blood of an individual.
In a scenario where sugar is converted into carbohydrates regardless of insulin content then there will be a lower amount present in the blood which is why true was chosen as the correct choice.
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View the attached worksheet. On this worksheet, you will build realistic (think of the animals and plants that exist in ecosystems near you) food chains that become increasingly more complex. You will use the information on your food chains to build a food web at the very end.
Sun -> Oak- > decomposer
Sun -> eucalyptus -> koala - > decomposer
Sun -> carrot -> rabbit -> owl- > decomposer
Sun -> algae -> krill -> penguin -> seal - > decomposer
Sun -> grass -> grasshoper -> mouse -> snake- > hawk -> decomposer
Why isn’t the mitochondria classified as part of the endomenbrame system
The endomembrane system encompasses the organelles that mediate the importa, export of molecules, that is, the transport of molecules from the environment to the cytoplasm and from the cytoplasm to the environment, respectively. The organelles that participate in such activities are the endoplasmic reticulum, the golgi apparatus, vacuoles and the cell membrane. Mithocondria's main purpose is energy production through oxidation of the carbohydrates/lipids we consume, thus, it is not related to molecule transport, and it can not be part of the endomembrane system.
The element chlorine belongs to which of the following groups?
*
2 points
alkali metals
halogens
noble gases
alkaline earth metals
Answer:
hallogens
Explanation:
b/c alkali and alkaline eearth metals both are group 1 and 2 hallogens group 7 and noble gases group 8 .
What happens to oil when it enters the water? Explain how this property of oil contributes to the effects of oil spills in ocean ecosystems.
Oil is insoluble in water. When oil spills in the ocean it creates great "oil islands". These islands are devoid of nutrientes, oxygen or any compound normally found in water. So they represent a massive perturbation to marine biota. Beside this oil disrupts, and frequently kills, marine fauna, such as water birds, and cetaceans.
You are examining a patient who has been in an accident. You test their motor skills and find that they can move their limbs but cannot write with a pencil and stumble often when walking. You conclude that they have damage to the part of the brain that governs fine muscle control. What area is this?A. Brain stemB. PituitaryC. Cerebral cortexD. Cerebellum
The answer is the letter D. Cerebellum- responsible for fine muscle control.
*Cerebellum is responsible for maintaining balance and posture.
Photosynthesis question: Suppose that a plant had chloroplasts that could carry out the Calvin cycle, but these chloroplasts could not carry out the light-dependent reactions. Explain why these chloroplasts could not carry out photosynthesis to produce sugars.
Light-dependent reactions produce ATP and NADPH that are used during light-independent reactions. Chloroplasts could not carry out photosynthesis to produce sugars because no ATP or NADPH would be available to carry out the Calvin cycle.
What is photosynthesis?Photosynthesis is the process through which plants take solar energy to produce organic compounds. Two alternating and closely related stages are involved in this process.
Light-dependent reactionsDuring this stage, chlorophyll molecules absorb luminous energy from the sun and turn it into chemical energy.
This event takes place in the thylakoidal membrane where the electron transporter chain is located.
The final result is the production of ATP and NADPH and oxygen release from water molecules.
Light-independent reactionsThis stage is known as the Calvin cycle and occurs in the chloroplast stroma.
CO₂ enters the leaves and fixates, producing organic compounds like carbohydrates.
The whole cycle is possible because it uses ATP and NADPH produced during light-dependent reactions.
According to this information, chloroplasts could not carry out photosynthesis to produce sugars because, in the absence of light-dependent reactions, solar energy could not be absorbed, and chemical energy needed for the Calvin cycle would not be produced.
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Standard NCES.7.L.2.2-Two tall plants (homozygous dominant) are crossed. What are the expected phenotypes of the offspring?
Group of answer choices
all short plants
all tall plants
some tall plants and some short plants
one tall plant and the rest short plants
In the figure, Side A is pure water and Side B is a 10% starch solution.
There is a semi-permeable membrane between the sides. Is this osmosis or simple diffusion? Why does the level in side B rise?
Water may pass readily across a semipermeable membrane, but solute cannot. Water travels to the solution side as the membrane divides pure water on the right from solution on the left. Osmosis is the cause of this water flow.
Why did water cross the permeable membrane from one side to the other?Osmosis is the net movement of water across a membrane that is permeable only to certain substances, and it is caused by the concentrations of different solutes on each side of the membrane.
Osmosis is the mechanism through which water diffuses across cell membranes. Osmosis is the process by which water moves from one region of low solute (dissolved material) concentration to another region of high solute concentration through a semipermeable membrane.
Osmosis is the process through which water diffuses across a semipermeable membrane based on the gradient of water concentration across the membrane. Osmosis simply moves water over a membrane, whereas diffusion moves materials both inside cells and across membranes.
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Photosynthesis, What goes in, What goes out, and Where within the cell does it occur?
Photosynthesis is the course where plants utilize sunlight, H20, and CO2 to build O2 and energy in the form of sugar.
In the course of photosynthesis, plants take in CO2 and H20 from the air and soil. Inside the plant cell, the H20 is degenerated or give up electrons, at the same time the CO2 is decreased or avails electrons. This converts the H20 into O2 and the C02 into glucose. The plant then discharges the O2 back into the air, and stock energy within the glucose molecules.
Photosynthesis takes place in small organelles called chloroplasts that stock the energy of sunlight. The chloroplasts contain the chlorophyll which is the primary pigment utilized in photosynthesis. The chloroplasts are enclosed by a double membrane and consist of a third inner membrane called thylakoid membrane that builds long folds within the organelle.
Answer - What goes in - CO2 and H20
What goes out - O2 and sugar
Where it occur - sunlight
The light reactions of photosynthesis takes place in the thylakoid membranes of the chloroplast. The light reactions catch energy from the sunlight which they alter to chemical energy and stock in molecules of NADPH and ATP.
In a group of teocards, some individuals have a spotted coat and others have a black coat. Inthis group, the gene for the coat pattern trait has two alleles. The allele A is for a spottedcost, and the allele a is for a black coat.Farah is a leopard from this group. Farah's phenotype for the coat pattern trait is a spottedcat. Fera's genotype for the coat pattern gene is AA.Based on this information, complete the following statementfor the coat patter gene,homozygousheterozygous
The trait of interest is "coat pattern"
There are two observable phenotypes for this trait:
- Spotted coat
-Black coat
This trait is coded by two alleles:
A → code for a spotted coat
a → code for a black coat
Farah is a leopard with the phenotype "spotted coat" and its genotype is AA.
The genotype of this individual has two identical alleles. Genotypes with two identical alleles are called homozygous.
Which of the following has the highest average salinity?
w. Mediterranean Sea
x. Atlantic Ocean
y. Arctic Ocean
Z. Gulf of Mexico
Salinity is the measure of how much salt has been dissolved in a body of water. It significantly affects conductivity and has an impact on a variety of chemical properties of natural waters, as well as the biological processes that occur there.
Explain about the salinity?Lake describes the Dead Sea. The Salt Sea is another name for it. With a salinity of 33.7%, the Dead Sea is the saltiest body of water on earth.
Either grams of salt per kilogram of water or parts per thousand are used to express salinity. For instance, your salinity is 1g/kg, or 1 ppt (ppt, or ), if you have 1 gram of salt and 1,000 grams of water. Salt content in freshwater is typically less than 0.5 ppt.
The Atlantic Ocean is the saltiest of the five ocean basins. Near the equator and at both poles, salinity generally decreases noticeably, though for various reasons. The tropics, which are close to the equator, consistently get the most rain.
The answer is Atlantic ocean
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There is a key difference between aerobic respiration (cellular respiration) and anaerobic respiration (fermentation). Explain this difference and what is the overall equation for aerobic cellular respiration.
The key difference is that aerobic respiration requires oxygen, and anaerobic respiration does not.
Aerobic respiration in a cell is when glucose breaks down with help of oxygen and yields carbon dioxide, water, and with the release of energy. Thus end products are [tex]CO_2}[/tex] and [tex]H_{2}O[/tex] .The process of releasing energy takes a much longer time. Example it occurs in plants and animals.
Anaerobic respiration in a cell, is the process of breaking down glucose without the use of oxygen then it yields to the end products [tex]CO_{2}[/tex] (carbon dioxide), alcohol and energy. It is a fast process. Example human muscle cells, and bacteria.
The equation for aerobic cellular respiration
[tex]C_{6} H_{12} O_{6} + 6O_{2}[/tex] ⇒ [tex]6CO_{2} + 6H_{2}O[/tex] + ATP(energy)
Glucose + oxygen ⇒ carbon dioxide + water +energy.
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What’s the correct answer answer asap for brainlist
Answer:
the answer is option a
hope this helps
True or False: Blood sugar would be lower than normal if alpha cells constantly secreted insulin.
Answer:
The human body wants blood glucose (blood sugar) maintained in a very narrow range. Insulin and glucagon are the hormones which make this happen. Both insulin and glucagon are secreted from the pancreas, and thus are referred to as pancreatic endocrine hormones. The picture on the left shows the intimate relationship both insulin and glucagon have to each other. Note that the pancreas serves as the central player in this scheme. It is the production of insulin and glucagon by the pancreas which ultimately determines if a patient has diabetes, hypoglycemia, or some other sugar problem.
A scientist claims that Elysia chlorotica, a species of sea slug, is capable of photosynthesis. Which of the following observations provides the best evidence to support the claim?1) Elysia chlorotica grows in the dark when food sources are available.2) Elysia chlorotica grows faster when exposed to light than when placed in the dark.3) Elysia chlorotica will die if not exposed to light.4) Elysia chlorotica grows when exposed to light in the absence of other food sources.
The observation which best supports the claim that Elysia chlorotica is capable of photosynthesis is number 4. The ability to photosynthesize doesn't mean it won't be able to eat other food sources when abailable, but that it will be able to survive and grow in abscense of food sources if it is exposed to light, as light is necessary to obtain the energy for the process of photosyntesis.