The correct answer is (a )
This experiment shows that the life has evolved from the inorganic materials. The substances like carbon dioxide, nitrogen gas when heated and exposed to UV radiation led to generation of life supporting element called as amino acids. The UV radiation and heat provided the energy needed by gases to convert into amino acids.
what are some important reasons for studying biology
The physical need to eat food is called A. hunger B. appetite C. Psycological desire. D. nutritional value A?
The physical need to eat food is referred to as hunger. Appetite, psychological desire, and nutritional value are separate aspects related to food consumption. Hunger is a body's physical demand for energy.
Explanation:The physical need to eat food is primarily driven by a body's demand for energy and is known as hunger. This is different from appetite, which is the desire to eat food often prompted by external factors such as sight, smell, or thought of food, not necessarily due to physical need. Psychological desire could be a craving to eat a specific kind of food and nutritional value refers to the benefits we get from the food we eat.
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Scientists believe plant life moved from water to land and that plants evolved from multicellular _____.
plankton
green algae
protists
protozoa
which three elements do all four biomolecules have in common
The three elements that are common in all four organic molecules are carbon, hydrogen, and oxygen.
The three forms of almost all chemical structures needed for life, including carbohydrates, lipids, and proteins.
The four main classes of organic compounds are - carbohydrates, lipids, proteins, and nucleic acids that are essential to the proper functioning of all living things are known as polymers or macromolecules.All of these compounds are built primarily of carbon, hydrogen, and oxygen but in different ratios. They are produced by cells and living organisms.Biomolecules contain various elements like carbon, nitrogen, hydrogen, oxygen, sulfur, and phosphorus.Among all these elements, carbon, oxygen and hydrogen are commonly found in all biomolecules.Thus, The three forms of almost all chemical structures needed for life, including carbohydrates, lipids, and proteins.
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Digestion takes place inside blank containing blank
Digestion occurs inside organs that contain various enzymes. These enzymes, found in organs like the stomach and intestines, help break down food into nutrients. The enzymes lactase, maltase, and sucrase in the small intestines, for example, assist in the digestion of sugars.
Explanation:Digestion takes place inside structures called organs containing various enzymes. So, the full sentence should read: Digestion takes place inside organs containing enzymes. The digestive system, for instance, is made up of organs such as the stomach and intestines where enzymes break down food into nutrients. In the stomach, pepsin helps digest proteins, while in the small intestines, enzymes like lactase, maltase, and sucrase aid in the digestion of sugars.
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A scientist is studying the action of RNA polymerase during transcription. He wants to know what type of bases are added to the growing mRNA by RNA polymerase.
A:bases complementaryto the template DNA
B:bases the same as those in the template
C:bases similar to the template DNA
the primary function of the sensory division of the peripheral nervous system is to transmit impulses.
a. from sense organs to the central nervous system
b. from the spinal cord to the brain
c. from the brain to the muscles
d. from one sense organ to another
The answer is A, i took the course.
Scientists use observations and data to form and test
Scientists use observations and data to form and test hypotheses. They observe a phenomenon, form a hypothesis about why it occurs, and use data to test its validity through experiments, making observations and data the backbone of the scientific method.
Explanation:Scientists use observations and data to form and test hypotheses. These hypotheses are proposed explanations for specific phenomena that have been observed. A scientist makes an observation, forms a hypothesis about why that phenomenon occurs, and then uses data to test the validity of the hypothesis.
For example, a scientist may observe that certain plants grow better in certain types of soil. They might form a hypothesis that the nutrients in the soil are causing this difference. To test this hypothesis, they would conduct an experiment comparing plant growth in different types of soil, carefully recording and analyzing the data from this experiment.
In this way, observations and data form the backbone of the scientific method, which is a systematic and logical approach to discovering how things in the universe work.
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A certain cell can no longer package and release materials out of the cell. which of the cells organelles is not working?
Answer:
golgi apparatus
Explanation:
Explain how independent assortment occurs in cells and explain its importance.
Answer: Independent Assortment is the second law of inheritance.
Traits are passed from parents to offspring independently of one another.
Independent assortment is random and occurs during Metaphase 1 of meiosis.
These are two possible alignments for the chromosomes.
Since the alignments are random and not assigned, genetic variation occurs.
Explanation: On Ed
Independent assortment occurs during meiosis when homologous chromosomes line up randomly, allowing for genetic variation. Recombination through crossover events further contributes to independent assortment. This ensures that alleles on a given chromosome are not always inherited together, promoting genetic diversity.
Explanation:Independent assortment occurs during meiosis when homologous chromosomes line up in random orientations during metaphase I. Each gamete can contain any combination of paternal and maternal chromosomes, resulting in genetic variation. Recombination through crossover events also contributes to independent assortment by exchanging genetic material on homologous chromosomes. This ensures that alleles on a given chromosome are not always inherited together, allowing for more genetic diversity.
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The explanation which Isaac Newton gave for the equal and opposite reaction to every applied force is summarized in:
A.1st Law
B.2nd Law
C.3rd Law
D.Universal Gravitation
How can you use composition and texture to identify common rocks?
Describe two themes that connect all the information in biology. use an example to help explain the theme
Answer:
Two themes that connect all the information in biology are structure and function.
Explanation:
In word Biology, bio means life and logy means study. The study of life is Biology. The study involves structure and function features of living things. The structure and function tells us about the interaction of living organisms with the environment. For example, the large organisms have small surface area and small organisms have large surface area. This helps in heat lost or conservation.
When a species is made up of different smaller groups, each of those smaller groups is known as a _____.
Which is NOT a function of blood? a. carrying oxygen from the cells to the lungs c. transport nutrients to the cells b. transporting waste to the kidneys d. carrying cells and molecules to fight infection
The function that is NOT assigned to blood is carrying oxygen from the cells to the lungs. The actual task of blood includes transporting oxygen from the lungs to the cells, nutrients from the digestive system to the cells, carrying waste to the kidneys, and transporting cells, molecules to fight infections.
Explanation:The function of blood in the body is not to carry oxygen from the cells to the lungs. Instead, one of the primary roles of blood is its responsibility to transport oxygen from the lungs to the various cells throughout the body. In addition to carrying oxygen, our blood carries numerous other essential substances.
These include nutrients (which are transported from the digestive system to other areas of the body), waste products
(which are moved to the kidneys for removal), and cells, molecules, and antibodies that help our bodies to fight off infection and heal from injuries.
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What is the definition of mitosis?
The MOST accurate way to determine the evolutionary relationship between two animals is through the examination of
Answer:
The MOST accurate way to determine the evolutionary relationship between two animals is through the examination of DNA.
Explanation:
The diversity of life forms on Earth originated from mutations selected by greater reproductive capacity over time. From the DNA of the original cell came the infinity of life forms with which we share the earth through the mechanisms of mutation and recombination.
Evolutionary history shows us how all living beings are more or less related to each other. Some percentages of similarity between the sequences of the human genome and other species are striking: we have 95% in common with chimpanzees, 89% with mice; 45% with fruit flies and up to 9% with Escherichia coli, the bacteria in our intestines. This similarity is an indication of the common origin of all living beings and enables the analysis of divergences from one species to another.
Unicellular prokaryotes,called___________, are adapted to living in a remarkable number of different places. ...?
The fluid mosaic model describes the structure of the plasma membrane. Embedded within the plasma membrane are proteins and carbohydrates that contribute to the term mosaic. Glycolipids and glycoproteins are examples of carbohydrates from on the surface of red blood cells that determine ABO blood type. These glycoproteins and glycolipids are important for
A. Cell to cell identification
B. Active Transport
C. Diffusion
A. Cell to cell identification
How do small intestinal epithelial and root hair cells function in nutrient procurement?
In the small intestine, the epithelial cells of the villi, which are covered with microvilli, absorb water-soluble nutrients such as sugars and amino acids into the bloodstream, while fatty acids and fat-soluble vitamins are absorbed by lacteals into the lymphatic system. These structures increase the surface area for efficient nutrient uptake.
Explanation:Function of Small Intestinal Epithelial and Root Hair Cells in Nutrient ProcurementThe small intestine is where the majority of nutrient absorption occurs after the digestion of protein, fats, and carbohydrates. The inner surface of the small intestine contains many villi, which are finger-like projections, and the surface of these villi is covered with microvilli. This significantly increases the surface area for absorption, enhancing the efficiency of nutrient uptake. The epithelial cells lining the villi are responsible for transporting nutrients into the bloodstream and lymphatic system.
Each microvillus, as seen under a transmission electron microscope, is approximately 1 µm long and 0.1 µm in diameter. The core of these microvilli contains actin microfilaments, assisting in the absorption process. In the small intestine, water-soluble nutrients, such as simple sugars and amino acids, are absorbed directly into the capillary blood in the villi and then transported to the liver via the hepatic portal vein.
Conversely, fatty acids and fat-soluble vitamins are absorbed by lacteals, which are part of the lymphatic system within the villi. Root hair cells, while not covered in this question, have a similar absorptive role in plants, taking up water and nutrients from the soil.
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Many types of scientific equipment are used to perform different functions in the science lab. Which of the following combinations of equipment would be needed to bring one liter of water to 85°C?
a.
graduated cylinder, balance, beaker and hot plate
b.
graduated cylinder, beaker, thermometer and hot plate
c.
test tube, thermometer, and Bunsen burner
d.
test tube, electronic balance and hot plate
Answer: Option B
Explanation: Graduated cylinder, beaker, thermometer and hot plate
A graduated cylinder is a equipment which has readings for the measurement of the liquids or substance s that is kept inside it.
Beaker is an equipment which is used to boil water in this case by keeping on the hot plate.
The hot plate is used to heat the substances kept on it. Thermometer is used to measure the temperature of the substance.
These equipment are used to heat one liter water and make its temperature 85°C.
What is the source of a stream called?
A. Reservoir
B. Creek
C. Floodplain
D. Headwaters
Headwaters is the source of a stream.
What is Headwaters?A stream or river's headwaters are its starting point. They are situated at the farthest point from the water body's outlet or point of confluence. These mountainous and often forested regions are where two thirds of California's surface water supply is produced.
Although the physical, biological, and chemical characteristics of a river's headwaters can have a significant impact on its downstream flows, the size and strength of a river's flow are not always controlled by its origin.
All along the length of the body of water, there are creatures, sediments, minerals, pollutants, and other compounds that have either been added by runoff or are naturally present in these river sources.
Therefore, Headwaters is the source of a stream.
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Which of the following can impact the climate of an area based on its geographical relief, such as whether it is close to mountains or ocean?
A.latitude
B.elevation
C.winds
D.topography
A species that is no longer in existence would best be characterized as which of the following?
threatened
endangered
extinct
dinosaurs
Answer:
Extinct.
Explanation:
The IUCN red list classifies the organism as endangered , extinct, threatened and vulnerable organism. The organism are classified on the basis of their number and presence on the particular area.
Extinct species is the species that are no longer present on the earth. The extinct species has been eliminated due to the unfavorable environmental condition and due to human activities. No single organism is present of the extinct species.
Thus, the correct answer is option (3).
What are some safety concerns for students working in the lab?
A leaf in which small veins extend outward from a single main veins has what type of ventaion?
An experiment in which only one variable is changed is a(an) __________ experiment.
A. randomized
B. natural
C. double blind
D. controlled
Answer;
D. controlled
An experiment in which only one variable is changed is a controlled experiment.
Explanation;
-A control experiment is an experiment where the researcher only changes one variable at a time in order to isolate the results.
In a controlled experiment, most conditions are constrained so that they do not change. One or two other conditions are then changed and measured by the experimenter. These are known as the independent variables.
For example; An experiment where all subjects involved in the experiment are treated exactly the same except for one deviation.
An experiment that is only one variable that has changed is a controlled variable experiment.
the independent/controlled variable
is a variable that can be changed according to the purpose of the experiment
Further explanation
The development of chemistry begins with experiments that consist of chemical stages/processes. This method is a form of the scientific method that is commonly used by scientists in carrying out experiments.
Several experiments, trials, and errors will be carried out to test the hypothesis until the expected results are in the predetermined problem at the outset.
Variables, which can be determined in 2:
1. independent variable, which is a variable that can be changed according to the purpose of the experiment
2. fixed variable, i.e. variable whose value is constant and observed to determine changes in independent variablesWe can control independent variables according to the results of the experiments to find conditions that have the most optimal results so that the goals of the problems that have been set will be achieved.
The continuous investigation is so that the control variables are not out of the problem boundary
So the right choice is a controlled variable
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Keywords: scientific method, fixed variable, an independent variable
what are 4 phrases describing osmosis
Answer
The phrases would be;
-A passive transport
-Movement of water molecules
-Through a semipermeable membrane
-From a higher concentration to a lower concentration
Explanation;Osmosis is the process by which water moves from its higher concentration to a region of its lower concentration through a semipermeable membrane. Osmosis is an example of passive transport, since it does not require energy like the case of active transport.For example, when a cell is put in a hypotonic solution, a solution with more solvent concentration, the cells absorbs water from the solution through osmosis and increases in size.Which component of blood protects us from invading foreign material?
The components of blood that protect us from invading foreign materials are White Blood Cells, certain proteins in the plasma such as antibodies, antigens, and platelets.
Explanation:The component of blood that protects us from invading foreign material is primarily the White Blood Cells (WBCs), or leukocytes, as part of the immune response. WBCs identify and target invading bacteria, viruses, and other foreign organisms. Not only do they combat foreign invaders, but they also recycle waste components such as old Red Blood Cells.
In addition to WBCs, certain proteins in the plasma, such as antibodies and cytokines, defend the body against infection and other threats. For instance, when damage occurs to blood vessels resulting in bleeding, blood platelets and coagulation factors present in the plasma interact to seal the ruptured areas, preventing further blood loss and protecting the body.
Another important component, called antigens, triggers an immune response when foreign antigens appear in our blood. Proteins known as antibodies, produced by certain B lymphocytes called plasma cells, attach to these foreign antigens to neutralize them.
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Suppose that Louisa is cut by broken glass during a lab accident. Which is the proper place to dispose of the paper towels that are used to clean up the blood?
broken glass container
hazardous waste container
spilled chemicals container
classroom waste container
Answer: hazardous waste container
Explanation:
A hazardous waste container is the container where hazardous waste which have been used in clinical trials, hospital use, nuclear power plants, hazardous chemicals from the laboratory can be stored, treated and transported.
Biohazardous waste, is the infectious waste which can be grown over the biological material like tissues, body organs, blood, urine, blood transfusion tube and others.
The paper towel will contain blood which is subjected to the growth of the pathogens and can cause huge infection hence, it is the example of material which should be disposed off in the hazardous waste container.