C371 Concepts in Science
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Free C371 Concepts in Science Questions
In cellular respiration, stored chemical energy in...
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Organic molecules is converted to ATP molecules
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ATP molecules is used to build NADH molecule
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ATP is used to make organic molecules like glucose
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ATP and NADH is converted to carbohydrate molecules
Explanation
Explanation
Cellular respiration is the process by which cells extract energy from organic molecules, such as glucose, and convert it into ATP, the energy currency of the cell. ATP stores and provides energy for cellular activities. NADH is an electron carrier produced during the process, but the primary conversion is from chemical energy in organic molecules to ATP. The other options describe processes that do not reflect the main energy transfer in cellular respiration.
Correct Answer
Organic molecules is converted to ATP molecules
Which of the following systems is responsible for the production of hormones?
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Immune
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Endocrine
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Digestive
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Skeletal
Explanation
Explanation
The endocrine system is responsible for producing and releasing hormones, which are chemical messengers that regulate processes such as growth, metabolism, reproduction, and homeostasis. The immune system defends the body against pathogens, the digestive system processes and absorbs nutrients, and the skeletal system provides structural support. Only the endocrine system produces hormones.
Correct Answer
Endocrine
Geologists discovered sedimentary rock layers containing fossils of freshwater organisms at a location currently situated in a desert. Which of the following conclusions can be drawn from this finding?
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The fossils were formed in a lake that has since dried up.
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The area has always been a desert with no water bodies.
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The fossils were transported to the site by human activity.
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The sedimentary layers were formed from volcanic activity.
Explanation
Explanation
The presence of fossils of freshwater organisms in sedimentary rock indicates that the area once had a freshwater environment, such as a lake or river. Over time, environmental changes can transform the region into a desert, but the fossils provide evidence of past conditions. Human transport or volcanic activity is unlikely to explain the presence of these fossils, and the area could not have always been a desert if freshwater organisms lived there.
Correct Answer
The fossils were formed in a lake that has since dried up.
The waste from which type of power plant produces the least amount of greenhouse gases?
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A coal power plant
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A gas power plant
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A nuclear power plant
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An oil power plant
Explanation
Explanation
Nuclear power plants generate electricity through nuclear fission, which produces energy without burning fossil fuels. As a result, they release negligible amounts of greenhouse gases compared to coal, gas, and oil power plants, which combust fossil fuels and emit significant amounts of carbon dioxide and other greenhouse gases. Nuclear power is considered a low-carbon energy source despite producing radioactive waste, which is not a greenhouse gas.
Correct Answer
A nuclear power plant
Black bread mold belongs to which group?
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Chytrids
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Microsporadians
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Zoopagomycetes
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Mucoromycetes
Explanation
Explanation
Black bread mold is classified in the group Mucoromycetes, which is a class of fungi within the phylum Zygomycota. These fungi are commonly found on decaying organic matter, including bread, and reproduce both sexually and asexually. Chytrids are primarily aquatic fungi, Microsporadians are intracellular parasites, and Zoopagomycetes include fungi that often parasitize small animals or other fungi, making Mucoromycetes the correct group for black bread mold.
Correct Answer
Mucoromycetes
In a classroom experiment on tectonic plate movement, students are tasked with selecting a material to simulate the lithosphere, which is the rigid outer layer of Earth. Which of the following materials would be the most appropriate choice to represent the lithosphere?
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A flexible rubber sheet that can easily bend
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A thick piece of cardboard that holds its shape
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A container filled with water that can flow freely
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A sponge that compresses under pressure
Explanation
Explanation
The lithosphere is the rigid, outermost layer of Earth that includes the crust and the uppermost mantle. To simulate its properties in an experiment, a material that is stiff and maintains its shape is ideal. A thick piece of cardboard is rigid and does not easily bend or flow, making it a good analog. Flexible, flowing, or compressible materials do not accurately represent the mechanical properties of the lithosphere.
Correct Answer
A thick piece of cardboard that holds its shape
Which of the following statements accurately describes the nature of a covalent bond?
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A covalent bond is formed through the transfer of electrons from one atom to another.
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A covalent bond occurs when two atoms share one or more pairs of electrons.
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A covalent bond results from the attraction between two positively charged ions.
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A covalent bond is created when atoms collide and fuse their nuclei.
Explanation
Explanation
A covalent bond is a chemical bond formed when two atoms share one or more pairs of electrons, allowing each atom to achieve a stable electron configuration. This sharing results in a strong bond that holds the atoms together. In contrast, electron transfer forms ionic bonds, attraction between positive ions is not covalent, and nuclear fusion is a process in stars, not a chemical bond.
Correct Answer
A covalent bond occurs when two atoms share one or more pairs of electrons
What does a triple-beam balance require the user to do?
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Add the numbers from the three sliders to determine the mass of an object
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Multiply the numbers from the three sliders to determine the mass of an object
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Add the numbers from the three sliders to determine the volume of an object
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Multiply the numbers from the three sliders to determine the volume of an object
Explanation
Explanation
A triple-beam balance measures the mass of an object by using three sliding weights (sliders) on separate beams. To determine the total mass, the user reads the values from all three sliders and adds them together. This sum represents the mass of the object. Volume is not measured directly with a triple-beam balance, and multiplication of the slider values is not part of the procedure.
Correct Answer
Add the numbers from the three sliders to determine the mass of an object
How does the presence of a tree-fall gap influence the growth of certain plant species in a mature forest ecosystem?
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By allowing increased moisture retention in the soil
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By enhancing the growth of shade-tolerant species
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By facilitating the establishment of light-demanding species
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By promoting the spread of invasive species
Explanation
Explanation
A tree-fall gap in a mature forest allows sunlight to penetrate to the forest floor, creating conditions favorable for light-demanding (shade-intolerant) species to establish and grow. These gaps increase the availability of light and sometimes nutrients, enabling species that cannot survive in dense shade to thrive. While soil moisture and invasive species may be affected, the primary ecological effect is facilitating the growth of plants that require more light than the shaded forest understory provides.
Correct Answer
By facilitating the establishment of light-demanding species
Which of the following describes a key role of plant roots in relation to water and nutrients?
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Facilitating gas exchange with the atmosphere
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Storing energy in the form of starch
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Absorbing water and essential minerals from the soil
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Producing flowers and seeds for reproduction
Explanation
Explanation
Plant roots serve as the primary organs for absorbing water and essential minerals from the soil, which are vital for growth, photosynthesis, and other physiological processes. While roots can also store some energy in the form of starch, their central role is nutrient and water uptake. Gas exchange primarily occurs in leaves, and the production of flowers and seeds is a function of reproductive structures, not roots.
Correct Answer
Absorbing water and essential minerals from the soil
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