It is not until the final period of prenatal development, the _____ stage, that the developing child becomes easily recognizable.
Why is it necessary that the solar concentrators used by solar power plants be able to move throughout the day? To avoid rain damage To track the sun as it moves across the sky To direct sunlight to different parts of the power plant To change the focus area of the incoming radiation
A new protein supplement is designed to help athletes gain weight. To test this claim, 40 athletes are studied. 20 athletes are given the supplement and the other 20 are given a placebo. There weight is measured each week for 12 weeks. What is the responding or dependent variable?
Answer:
The responding or dependent variable is the weight gain by athletes
Explanation:
A variable whose effective value or performance is dependent on one or more independent variable is known as dependent variable
In this experiment, protein supplement is an independent variable as its value is not dependent on any other factor. While , the value of weight gain by athletes is dependent on intake of protein supplement
Hence, the responding or dependent variable is the weight gain by athletes.
throughout history which of these is an ecological impact associated with agriculture
3. What material does the nucleus contain? What is the purpose of this material? The nucleus contains "the cell's genetic material, DNA." DNA makes protein molecules to help with almost every cellular process. 4. Using evidence from the text, describe the purpose of the cell membrane. 5. How do the two types of endoplasmic reticulum differ? 6. Using evidence from the text, describe the purpose of the Golgi complex. 7. Based on this excerpt, summarize the job of mitochondria. Excerpt: "About the size of pickup trucks from where you're floating, the organelles called mitochondria convert energy from your food into adenosine triphosphate, or ATP, to power biochemical reactions. A typical cell burns through 1 billion molecules of ATP every 1 to 2 minutes."
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The nucleus typically contains the genetic material of the cell in the form of either DNA or RNA. This genetic material gives the instruction in order to make protein molecules.
What is the purpose of the cell membrane?The purpose of the cell membrane is to protect the internal environment of a cell with respect to the outside environment.
The two types of ER significantly include rough and smooth endoplasmic reticulum. The ER sends newly synthesized proteins and lipids to the targeted organ namely the Golgi complex. Rough ER consists of ribosomes which play a key role in protein synthesis.
The purpose of the Golgi complex is to process the protein structure and instruct it to migrate to the next cellular organelles through the vesicularized form.
Mitochondria are known as the powerhouse of the cell as they transform energy in the form of ATP from our food in order to power biochemical reactions which are required for organisms' survival.
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A scientist isolated DNA from a particular bacterium and decided to analyze it. The sequence of the bacterial DNA is ATGGGCTAGTCTT. What will the complementary strand be?
What often results in a woodland without frequent fires?
A.A predominance of pine trees
B.A predominance of fast-growing trees
C.Barren land
D.An understory of oak trees
Answer:
Option D, An understory of oak trees
Explanation:
The State and transition models of the oak woodlands are depended on the fire cycle. It is also claimed by researchers that forest fire (disturbances) are important determinants of the patchy distribution of these vegetation types in woodland.
A woodland with no or without frequent fires has an understory of oak trees comprising of native annual and perennial trees, grasses and forbs. Most of these native tree , grass, forbs and shrub species vary in amount due to inadequate fire frequency.
Hence, option D is correct
A person calls the clinic and tells the primary health care provider, "last night i travelled to a ski resort located on the mountaintop. after arriving, i began to have difficulty breathing. i also have a headache, and i am very tired. is there a medication you can prescribe to help me?" which question does the nurse anticipate the primary health care provider will ask the patient before prescribing the appropriate treatment?
The _____ is the main means for transmitting messages between the brain and the body.
a. cortex
b. medulla
c. axon
d. spinal cord
The correct answer is d. spinal cord.
Spinal cord is a bundle of neurons which starts from the brain and runs down the entire length of the back of the body. The spinal cord acts as a main means to transmit the messages between the brain and the body.
Sensory or efferent neurons carry the information from the perimeter of the body and pass to the central nervous system whereas the motor or efferent neurons act as a communication channel and carry the information from the nervous system to various glands and muscles.
Because of mike's weight lifting, his muscles are adapting and growing larger. this muscle growth is called
A lack of awareness of oneself or one's surroundings is called
Answer: Delirium
A person who suffers delirium experience lack of awareness of oneself or one’s surroundings. Delirium is a serious disturbance in mental abilities results in confused thinking and reduced environmental awareness. This manifestation is transient and usually reversible but it can occur at any age especially in elderly who have previously compromised mental status.
forces that cause a change in motion are
A young woman was brought into the emergency room because of repeated seizures. her roommate said that the woman had taken the drug ecstasy the night before, and that she had been drinking a lot of water. a blood test showed her plasma na+ was very low: 120mm (normal 135-145), and her plasma osmolality was 250mosmoles/kg (normal 280-296). why would her low osmolality and low na+ concentration disrupt her brain function and cause seizures? what might be a possible therapy for this person?
which gases are carried by red blood cells. check all that apply
Answer:
The correct answer would be oxygen and carbon dioxide.
The main function of Red Blood Cells (RBCs) or erythrocytes is to transport oxygen from the lungs to all cells of the body. In addition, it transports carbon dioxide from cells to the lungs from where it is exhaled out.
RBCs contain iron containing biomolecule termed as hemoglobin. It can bind to oxygen as well as carbon dioxide in a reversible manner. It depends upon the partial pressure of the gases in a cell.
For example, at the alveolar site, the partial pressure of oxygen is high which increases the efficiency of hemoglobin towards oxygen. Oxygen then binds with hemoglobin in a reversible manner to form oxyhemoglobin.
At the cellular site, the partial pressure of carbon dioxide is higher as compared to that of oxygen. Consequently, oxygen is released and hemoglobin binds with carbon dioxide to form carbamino-hemoglobin.
H2O Given the chemical formula, how is this substance MOST LIKELY classified? A) atom Eliminate B) compound C) both atom and compound D) neither atom nor compound
Answer:
B compound
Explanation:
Which option correctly defines a scientific argument?
a)a type of reasoning that moves from general to specific explanations
b)a logical description of how data-based evidence supports or does not support a hypothesis
c)a type of reasoning that moves from specific to general explanations a process that involves creating
d)a hypothesis and then proving it correct through experimentation
Answer:
The correct option is B. Scientific argument is a logical description of how data-based evidence supports or does not support a hypothesis
Explanation:
When a scientist or a group of scientists agree or disagree with a certain hypothesis, scientific arguments are generated. Scientific argumentation plays a very important role in science. Based on these arguments, researches are conducted and then rec- conducted. Scientific argument provides logical reasoning for a particular hypothesis to be correct or wrong. A researcher has to support his scientific argument with sufficient pieces of evidence and facts to make it acceptable.
List the three bacterial species in order of their increasing fastidiousness
Answer:
S. mitis E. coli A. faecalisExplanation:
Fastidious bacteria are heterotrophic beings that require nutrients and vitamins that are specific to their development, and do not grow well in conventional culture media. Examples of such bacteria are S. mitis, E. coli and A. faecalis.
Fastidious means something that is dull, stressful. We say that a bacterium is fastidious because it is not easy to grow in culture media, using dull means to be able to observe them.
Organisms from two separate species can look anatomically similar. true or false? true false
In a windmill, electrical voltage is produced in the _____. rotor blades shaft generator wires to your house
Answer:
Option C, generator
Explanation:
The rotor blades acts as a barrier to the wind energy and thus when wind turns the blades , some of its energy is transferred to the rotor of the blades. As the rotor rotates, it also rotates the shaft and convert mechanical energy into electrical energy. The dynamo with in the generator is connected to the shaft of the turbine which produces electrical energy with certain ampere and voltage values. Thus , it can be said that electrical voltage is produced in the generator of the windmill.
Hence, option C is correct
If you were scaled down to half your size, what would you expect of your strength?
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Many different types of mutations can occur within the body. Sickle cell anemia is a disease that occurs when a mutation in a base pair of the hemoglobin beta gene causes a single replacement of the amino acid glutamic acid by the amino acid valine.
As a result of this mutation, the individual’s blood cells take on a sickle shape under certain conditions and form clusters that can block blood vessels and cause organ damage.Which type of mutation causes sickle cell anemia?
A.) silent
B.) missense
C.) insertion
D.) frameshift
Answer:
B
Explanation:
Sickle cell anemia is a mutation of the red blood cells, caused by a missense mutation of the beta-haemoglobin gene.
This mutation is known as a missense mutation because it mistakes one amino acid, for another. Instead of having the codon read GAG, which codes for glutamic acid, the codon mutates to read GUG, which codes for the amino acid valine.
This seemingly small mutation, has a major overall effect on the structure of the beta-haemoglobin protein that is formed.
The other options explained:
A silent mutation happens when a codon changes, but the overall outcome leads to the same amino acid being produced (CUU and CUA both code for the amino acid leucine).
An insertion mutation happens when a nucleotide is unintentionally added into the chain of nucleotides. This can also lead to a frame-shift mutation, depending on the number of nucleotides have been added. Due to the fact that codons are read in sets of three, if three nucleotides are added next to each other, then that insertion mutation will have the effect of adding another amino acid to the chain, without changing anything else. However, if only one or two nucleotides are added, this insertion causes a frame-shift mutation which can alter the amino acids that come after it.
Which of the following activities has a negative impact on biodiversity
Explain how a change in thermal energy causes matter to change from one state to another. Give two examples
A change in thermal energy can cause matter to change from one state to another through phase changes. For example, when ice is heated, it melts and changes into a liquid state. Similarly, when water is heated to its boiling point, it vaporizes and changes into a gaseous state.
Explanation:A change in thermal energy can cause matter to change from one state to another through phase changes. When thermal energy is added to a substance, its temperature increases, and it may undergo phase changes such as melting, vaporization, or sublimation. For example, when a solid is heated, such as ice, its thermal energy increases, causing it to melt and change into a liquid state. Similarly, when a liquid, like water, is heated to its boiling point, it undergoes vaporization and changes into a gaseous state. These phase changes occur because the added thermal energy breaks the bonds between molecules, allowing them to move more freely and change their arrangement.
The eccentricity of a perfect circle is zero. Which of these effects would be observed if the eccentricity of Earth’s orbit around the Sun were to become zero?
A) Earth would experience higher than average temperatures
B) Earth would experience the same seasons throughout the year
C) Earth would experience equal distances to aphelian and perihelion
D) Earth would experience more hours within a day
Answer:
C) Earth would experience equal distances to aphelian and perihelion
Explanation:
Aphelion is the point where earth is located fartest from the Sun and parihelion is the place where the earth is closes to the sun, and that is because the orbit of the earth is not a perfect circle, so since it is a kind of elipse, so the only option that we have that could be true is that we would experience equal distances to aphelian and perihelion, we would actually have seasons but will be created solely by the tilt of the eart axis.
If the eccentricity of Earth’s orbit around the Sun were to become zero, Earth would experience equal distances to aphelian and perihelion. Therefore, the correct option is C.
The eccentricity of an orbit refers to the degree of elongation or deviation from a perfect circle. When the eccentricity is zero, it means that the orbit is a perfect circle.
In the case of Earth's orbit around the Sun, if the eccentricity were to become zero, it would mean that the Earth's orbit would become a perfect circle with a constant distance from the Sun throughout the year.
As a result, the Earth would experience equal distances to aphelion (the farthest point from the Sun) and perihelion (the closest point to the Sun).
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If the aorta of the heart is damaged, which function of the heart will be affected first?
Damaging the aorta impacts the heart's ability to distribute oxygen-rich blood to the body first, as the aorta is the main artery responsible for this function.
If the aorta of the heart is damaged, the function of distributing oxygen-rich blood to the body will be affected first. The aorta receives blood directly from the left ventricle through the aortic valve and is responsible for carrying the blood to systemic circulation. Should the aorta suffer from conditions such as an aortic aneurysm or dissection, which are medical emergencies, the blood's path to the rest of the body would be compromised, leading to reduced oxygen and nutrient delivery and ultimately, can cause life-threatening complications.
European rabbits were introduced to Australia in the 1800s and spread quickly across the continent, causing massive erosion, crop damage, and weed dispersal. What allowed the nonnative rabbit population to grow so quickly?
Answer: Abiotic and biotic factors important to the rabbits' niche were plentiful.
Explanation:
Abiotic and biotic factors allowed the nonnative rabbit population to grow.
What are biotic and abiotic factors?Abiotic components or abiotic factors are non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems. Abiotic factors and the phenomena associated with them underpin biology as a whole.
Moreover, biotic and abiotic factors are what make up ecosystems. Biotic factors are living things within an ecosystem; such as plants, animals, and bacteria, while abiotic are non-living components; such as water, soil and atmosphere. The way these components interact is critical in an ecosystem.
Hence, biotic factors include animals, plants, fungi, bacteria, and protists. Some examples of abiotic factors are water, soil, air, sunlight, temperature, and minerals. For example, red pandas are distant relatives of raccoons and are found only in the eastern Himalayas.
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how do oceanographers define salinity
The nutrients that provide the greatest amount of energy per gram are _____
Final answer:
Fats and oils provide the greatest energy per gram at about 9 Calories per gram, compared to 4 Calories per gram provided by both proteins and carbohydrates.
Explanation:
Fats and oils stand out among macronutrients for their energy density, providing a substantial 9 Calories per gram, which is more than double the energy yield of proteins and carbohydrates, each offering around 4 Calories per gram. This higher caloric content underscores their significance as potent sources of energy in our diets, emphasizing the importance of understanding macronutrient composition for effective nutritional planning.
Such distinctions guide dietary choices, recognizing the pivotal role of fats and oils in supplying concentrated energy that fuels various physiological processes in the human body.
Which of the following is likely the direct source of energy to move the sailboat? A, sun B. Wind. C. Moving sails D, Moving water
Answer:
The most likely would be wind!
Explanation:
The wind will push the sail on the boat along the water. Although moving water can make a difference the most direct source of energy would be the wind!
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Based on her pre-pregnancy weight, if she is carrying a single baby, how much weight should sadie gain during her pregnancy?
a. 10 to 15 lbs
b. 15 to 25 lbs
c. 35 to 50 lbs
d. 5 to 10 lbs
e. 25 to 35 lbs
Answer:
15 to 25 lbs
Explanation:
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