Answer:
A. A scientist must research to understand the topic before being able to create a scientific hypothesis.
Oxygen and carbon dioxide molecules pass freely through cell membranes. Which factor determines thedirection most molecules will pass through the cell membrane?A the strength of the covalent bonds holding the gas atoms in the molecules.B the concentration of the gas molecules on each side of the membrane.the ionic charge on the outer shell of the gas molecules.D the size of the gas molecules.
There are three factors that determine whether a molecule can pass through a cell membrane: concentration, charge and size. The greater the difference in concentration, the more rapid the diffusion. Large and heavier molecules more more slowly so they diffuse more slowly.
B. the concentration of the gas molecules on each side of the membrane.
Water molecules evaporate from a lake near the equator and rise into the atmosphere, as shown in the diagram belowAs the molecules travel away from the equator, which step in the water cycle is most likely to happen next?
A) The molecules freeze and eventually form ice crystals
B) The molecules heat up and eventually form water vapor
C) The molecules cool and eventually form clouds
D) The molecules break apart and eventually form precipitation
Answer:
The answer is C) The molecules cool and eventually form clouds
Explanation:
The skeleton is controlled by the muscular system. What is the muscular systemcontrolled by?A. The voluntary nervous system.B. The endocrine system.C. The involuntary nervous system.D. The exocrine system.
The muscles are controlled by the nervous system, The somatic nervous (voluntary) system is the part of the peripheral nervous system associated with the voluntary control of skeletal muscles.
On the other hand, the involuntary nervous system represents the movement of cardiac muscle, and gland cells.
Therefore, the skeletal muscles are controlled by the voluntary nervous system. The answer is a.
A small group of foxes moved to a new environment, starting a new population.They began with a population of 10 foxes, and over the course of 2 years expandinto a population of 40. The population increased rapidly, but now food starts tobecome harder to find, and much of the living space is occupied. The populationstill grows, but at a decreased rate. Which part of the growth phase is thispopulation currently in?A. ExponentialB. LagC. TransitionalD. Plateau
When we are looking at a population we can see that passes through different stages, generally, there is a beginning or lag phase, then comes an accelerated gro also known as exponential or log phase, until the population stabilizes and reaches the ecosystem charge capacity, this is also known as stationary or plateau phase, therefore we can say that the correct answer is option D.
When we are looking at a population we can see that passes through different stages, generally, there is a beginning or lag phase, then comes an accelerated gro also known as exponential or log phase, until the population stabilizes and reaches the ecosystem charge capacity, this is also known as stationary or plateau phase, therefore we can say that the correct answer is option D.
In developing countries with high population rates, at which trophic level do people generally thrive?
In developing countries with high population rates, people generally thrive at a trophic level of 2.2.
Trophic levels are the positions that feed in a food chain or web. The population size diminishes as you move up the trophic levels of an environment.
Numerous consumers consume food at various trophic levels. When people eat plants like vegetables, they are the primary consumers. When they eat cows, they are incidental consumers. When they eat fillets, they are secondary consumers.
Higher trophic levels typically have fewer creatures since there is less energy there. At higher trophic levels, organisms are often greater in size, but because there are fewer of them, there is less biomass produced. The total mass of all trophic-level creatures is known as biomass.
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proteins assist the human body in which of the following ways
Chemical reaction:
yes, as enzymes are proteins that catalyze biochemical reactions.
Energy storage:
This is not a main function of proteins.
Fighting infections:
Yes, as antibodies are proteins that our imune system makes to help fight infection.
Chemical signaling:
yes, as many of the molecules used by a cell to communicate with others are proteins.
5. What are two advantages of glycolysis?
Answer:
1. it generates cellular energy
2. it can be carried throughout the cell which gives it an advantage over the TCA and oxidative cycles
The graph below shows the number of occupiedbald eagle nesting in North America between1960 and 2007.Which human activity most likely had the greatestinfluence on the trends shown in the graph?A. Breeding eagles in captivityB. Allowing the hunting of eagle predators innational forestsC. Releasing eagles into North American forestsfrom other continentsD.Conservation efforts, including a ban oncertain pesticides
The correct answer is D. Conservation efforts, including a ban on certain pesticides. Conservation efforts imply hunting restrictions, as well as delimiting extensive areas for their conservation and releasing captive reared individuals in its natural habitat.
Describe the structure and function of the skin
The skin is the largest organ of the human body. It has three layers: epidermis, dermis, and hypodermis.
The epidermis is the outermost layer. It is composed of keratinocytes, a type of epithelial cell that produces keratin. The compact nature of the epithelial cells of the epidermis makes the skin waterproof. Melanocytes are also found in this layer and produce melanin, or skin pigment. The epidermis function as protection against UV rays.
The dermis is the inner thicker layer that is mostly composed of connective tissue and connected to the epidermis by collagen fibers. The structures found in this layer are the hair follicle, hair root, sebaceous gland, and sweat gland. The dermis function is to excrete excess oils and waste out of the body through the production of sweat and production of vitamin D with specialized cells found in this skin layer.
The hypodermis is the innermost layer that is composed of adipose tissue. It functions as a cushion between the muscles and the skin.
Round seeds are dominant over wrinkled seeds. Yellow seeds are dominant
over green seeds. Cross a round yellow seed, which is heterozygous for both
traits with a wrinkled green seed, which is homozygous for both traits. Show
your work.
Cross a round yellow seed, which is heterozygous for both traits with a wrinkled green seed, which is homozygous for both traits.
Fusion of gametes Yy (yellow seeded) and yy (green seeded)
Thus, in F1 generation the ratio of yellow seeded plants to that of green seeded plants is 50:50.This cross is called as test cross where F1 generation is crossed with recessive parent.
In other case When a homozygous yellow round seeded plant(YYRR) is crossed with another homozygous pea plant with green wrinkled seeds(yyrr). The offspring's formed in the F1 generations are heterozygous Yellow round seeds(YyRr)
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IF YOU DO LUOA SCHOOL ANSWER THIS
Explain how God gave us ways to develop our knowledge. Remember to use complete sentences.
The ways God gave us to develop our knowledge include:
a brain that is able to learn and adapt to near thingshands that are able to acquire new skillsWhat are the special gifts God gave man?God created man to be unique from all other of his creations. The Bible said that God created man in his own image. This means that God has created us to demonstrate and to cultivate his own special qualities such as:
lovewisdomjustice, and powerGod created man with a special brain that is far superior to all other creations.
He also created man with hands to enable him to work with them.
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What percent of your body mass is made of water?
Answer:
60%
Explanation:
In adult men, about 60% of their bodies are water. However, fat tissue does not have as much water as lean tissue. In adult women, fat makes up more of the body than in men, so they have about 55% of their bodies are made of water. Most of the human body is water, with an average of roughly 60%. The amount of water in the body changes slightly with age, sex, and hydration levels. The amount of water in the human body ranges from 60-80%. The brain and heart are composed of 73% water, and the lungs are about 83% water. The typical percentage of the human body that is water is 60% in adult men according to Dr Jeffrey Utz of Allegheny University and 50% in adult women.
In a respiration experiment we are measuring the rate alcoholic Fermentation in yeast by measuring the amount of CO2 produced Please assist with following questions
Answer and explanation:
1. sources of error- in the experiment, the amount of carbon dioxide released by east is monitored, a source of error could be the carbon dioxide present in the atmosphere which would interfere with the results.
2. baking recipes add sugars and molasses to provide carbohydrates for the yeast. this acts as a source of energy for the fermentation process.
3. the respiration of yeast could be monitored by measured the amount of sugar used or by measuring the amount of ethanol produced in the respiration process
4. high concentrations of sugar my inhibit yeast activity most likely because of the high osmotic concentration which prevents yeast from getting enough water for growth. as the osmotic concentration increases a yeast cell will reach a pont where water moves out of the cell.
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.
A serum amylase is diluted 1/100 with a result of 45.0 U/L. What is the patient's actual amylase result?
A serum amylase is diluted 1/100 with a result of 45.0 U/L. The patient's actual amylase result is 4500 U/L.
Serum- Serum generally refers to the transparent fraction of any biological fluid, whether it comes from an animal or even a plant. For instance, the fluid released by serous glands is known as mammal serous (or serosal) fluid. The serum in blood is a clear, pale yellow liquid that is separated from of the blood and thus is free of blood cells & clotting components.
Amylase- The primary job of amylases is to hydrolyze all glycosidic linkages in molecules of starch, turning them to simple sugars. The three primary kinds of amylase enzymes—alpha, beta, and gamma—each affect the carbohydrate molecule in a different way.
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HELP!!!!
Which conditions are necessary for snow to form?
a) The temperature of the air in the cloud is above freezing.
b) The temperature of the air below the cloud is above freezing.
c) The temperatures of the cloud and the air below the cloud are at or below freezing.
d) The temperature of the cloud is below freezing, while the air below the cloud is above freezing.
Answer:
im pretty sure its c but this is what i found on the web: the atmospheric temperature is at or below freezing (0°C or 32°F).
Explanation:
Answer:
im pretty sure its c but this is what i found on the web: the atmospheric temperature is at or below freezing (0°C or 32°F).
Explanation:
what is a colony forming unit and how is it used to infer microbial numbers in a sample?
Explanation:
A colony forming unit, or CFU, is a unit commonly used to estimate the concentration of microorganisms in a test sample. The number of visible colonies (CFU) present on an agar plate can be multiplied by the dilution factor to provide a CFU/ml result.
A measure of the quantity of viable colonogenic cells per milliliter is called a colony forming unit (CFU). These give an idea of how many cells are still alive and able to divide and create small colonies.
What are the colony forming unit and infer microbial?Colony-forming unit (CFU, cfu, or CFU) is a unit used in microbiology to measure the number of viable microorganisms (bacteria, fungi, viruses, etc.) in a sample that can multiply through binary fission under controlled conditions.
Colony forming units, or CFUs, are frequently used to calculate the number of microorganisms present in a test sample.
A CFU/ml result can be obtained by multiplying the number of visible colonies (CFU) present on an agar plate by the dilution factor.
Therefore, A colony forming unit, or CFU, is a unit commonly used to estimate the concentration of microorganisms in a test sample.
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when have you used skills of observation, experimentation, modeling? Describe and example of how you have used this skill
Observation is the act of carefully watching something over time.
Experimentation Scientists may perform experiments in the lab or in the field. lab experiment gives the researcher more control, the artificial setting does not reflect the complex interactions that occur in nature.
Field experiment, on the other hand, gives a more accurate picture of how organisms interact in a natural setting.
Modeling scientists use computer and mathematical models to describe and model nature. example, It is possible for some people to learn and adapt to completely new computer systems at work, while others have adjusted to the challenges of working remotely.
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According to the theory of endosymbiosis, a mitochondria or chloroplast may have been a prey species and was engulfed by a cell or it could have been a parasite that entered the cell. WHY do scientists think that the cell did not destroy or remove these structures?
A: because they competed with the cell
B: because the structures benefited the cell
Answer:
Because the structures benefited the cell
Explanation:
Scientists believe that host cells and bacteria formed a mutually beneficial endosymbiotic relationship when the host cells ingested aerobic bacteria and cyanobacteria but did not destroy them.
Which example best describes a physical model that could be used to studythe human body?OA. A program designed to show how chemicals absorbed duringdigestion are transported to other parts of the bodyOB. A written description of how chemicals in food are broken downduring digestionO C. Molded plastic pieces that fit together to show the organs involvedin digestionD. A graph showing how blood sugar levels change throughout thedigestive process
The example that best describes a physical model that could be used to study the human body is a program designeed to show how chemicals absorbed during digestion are transported to other parts of the body.
The correct answer is option A.
If the model has been made accurately, the results shown would demostrate results that can reflect what actually occurs in the human body.
Can someone help with this ? Thank you if you can actually help
Answer:
a
Explanation:
What dangers and impacts on the marine ecosystem arise from harvesting fossil fuels such as oil and methane hydrates from the oceans?
In this case, we have that oil and methane extraction have great impacts on the ocean, as there is always the release of these materials to the surrounding environment causing water pollution, altering the equilibrium of fito and zooplankton the base of the ocean food web, even more, intense human activity in these areas generate fauna displacement and habitat loss. Also in less quantity tend to be a release of methane into the atmosphere which is a powerful greenhouse gas.
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?
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:
why is it important to swim with a friend even if there is a life gaurd on duty.
Answer:
because u can be drowned till the life guard on duty comes
Which physical change is usually more pronounced in adolescent males than in females?A. widening of the hipsB. accelerated gonad growthC. growth of body hair D. development of sweat glands
During puberty, the body goes through many internl and external changes. Puberty begins when an area of the brain called the hypothalamus starts signaling to the rest of the body that it is time to develop adult characteristics. These hormones cause growth and changes in different parts of the body.
Does the signal go to the spinal cord and turn around and come back out the spinal cord or does it go up to the brain to get processed before it comes back down?
The nerves in the body send signals along their pathway to the spinal cord, then to the brain. Once the signals reach your brain, your body registers the sensation, and you are able to feel it. Sensory signals travel so fast that it seems like you get the message instantaneously.
4. All enzymes have an optimal temperature at which they work as well as an optimal pH for their activity. Does this mean that enzymes only work at those specific temperatures and pH optimums? Briefly explain your answer using evidence from the unit that supports your answer.
Enzymes perform their functions within a specific temperature and pH range (which is specific for each enzyme in particular). In turn, within this range, there is a specific value at which they act in the most efficient way possible, which does not mean that they cannot on other values in the range. However, outside the limits of the range, the internal characteristic of enzymes can be affected and cause their denaturation, thus losing their capacity of action.
The density of gold is 19, 320 kg/m³ and the density of
mercury is 13, 500 kg/m³. If a cube of gold that measures
0.100 m on each side is placed in a tank of mercury and
weighed while under the surface, what is the apparent weight
of the cube?
The apparent weight of the submerged gold is 57N.
What is apparent weight?According to physics, an object's perceived weight is a characteristic that describes how heavy it is. When the force of gravity acting on an object is not counterbalanced by a force of equal but opposite normality, the apparent weight of the object will differ from the actual weight of the thing.The weight of a passenger on an elevator is one illustration. When the elevator starts to rise, the object starts to apply downward force. If a scale were used, it would be clear that the downward force is making the object heavier and changing its apparent weight.So, the weight of mercury is 13500kg/m³ × (0.1m)³ = 13.5kg = 132.3N.
The initial weight of gold is 19320kg/m³ × (0.1m)³ = 19.35kg = 189.3N.
Then, the apparent weight of submerged gold is:189.3N - 132.3N = 57NTherefore, the apparent weight of the submerged gold is 57N.
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You work with the Environmental Protection Agency and are attempting todetermine hazard levels for the insurance company. Which of the followingindividuals has the lowest risk of getting cancer?A. Someone taking hormone therapyB. A smokerC. Someone infected with HPVD. Someone getting heart bypass surgery
The individual with the lowest risk of getting cancer is someone getting a heart bypass surgery. Even though surgeries have riks, cancer is not one of them, and the rest of the conditions (HPV, hormone therapy and smoking) are fact
what is the term used to describe the process of producing gametes
Answer:
Gametes are formed through meiosis (reduction division), in which a germ cell undergoes two fissions, resulting in the production of four gametes. During fertilization, male and female gametes fuse, producing a diploid (i.e., containing paired chromosomes) zygote.
