You review anatomy, chemistry, and scientific reasoning the way TEAS 7 reports the science line. Five of the 15 questions include the correct answer and rationale. The other ten keep answers in the study hub. Continue with the ATI TEAS 7 exam guide or more ATI TEAS 7 practice questions.
Five science questions with answers
Cover the key. Write the first action. Then open the rationale and name why the other choices fail.
Question 1
Which of the following glands produces hormones that regulate metabolism?
A. Adrenal gland
B. Pituitary gland
C. Thyroid gland
D. Liver
Show answer and rationale
Correct answer: C — Thyroid gland
The thyroid gland is responsible for producing hormones that play a crucial role in regulating metabolism. One of the key hormones produced by the thyroid gland is thyroxine, which directly influences the body's metabolic rate. Therefore, the correct answer is the thyroid gland. The adrenal gland produces hormones like adrenaline, which are associated with the stress response and not primarily metabolic regulation. The pituitary gland regulates various other hormones but is not primarily responsible for metabolic regulation. The liver has a role in metabolism, mainly in processes like detoxification and nutrient storage, but it is not a gland that primarily produces hormones for metabolic regulation, making it an incorrect choice in this context.
Question 2
Immunoglobulin G (IgG) is the most abundant antibody type, responsible for:
A. Immediate allergic reactions
B. Neutralizing toxins and viruses
C. Activating other immune cells
D. Protecting newborns from infections
Show answer and rationale
Correct answer: B — Neutralizing toxins and viruses
Immunoglobulin G (IgG) is indeed the most prevalent antibody type in the blood and tissue fluids. Its primary functions include neutralizing toxins and viruses, promoting phagocytosis, and activating the complement system. IgG plays a crucial role in long-term immunity and provides passive immunity to newborns by crossing the placenta, safeguarding them from infections. Immediate allergic reactions are mainly mediated by IgE, not IgG. While IgM is known for activating other immune cells, IgG focuses on other key functions within the immune response, such as neutralizing pathogens and enhancing phagocytosis. Therefore, the correct answer is B, as IgG is primarily involved in neutralizing toxins and viruses, rather than the other options presented.
Question 3
What is the process of making copies of DNA called?
A. Transcription
B. Translation
C. Replication
D. DNA repair
Show answer and rationale
Correct answer: C — Replication
A) Transcription is the process of synthesizing RNA from a DNA template. It involves the creation of mRNA molecules from a DNA template.
B) Translation is the process of synthesizing proteins from mRNA. During translation, the genetic code carried by mRNA is decoded to produce a specific sequence of amino acids, forming a protein.
C) Replication is the process of making copies of DNA. This process occurs before cell division and ensures that each daughter cell receives an identical copy of the genetic material.
D) DNA repair is a cellular mechanism that corrects errors in DNA that arise due to various factors such as exposure to mutagens or mistakes during DNA replication. It is essential for maintaining the integrity of the genetic material.
Question 4
Which statement below correctly describes the movement of molecules in the body and in relation to the external environment?
A. Osmosis is the movement of a solution from an area of low solute concentration to an area of high solute concentration.
B. Diffusion is the process in which oxygen moves from the lungs into the bloodstream.
C. Dissipation is the transport of molecules across a semipermeable membrane from low to high concentration.
D. Reverse osmosis is the movement of molecules in a solution from high concentration to low concentration.
Show answer and rationale
Correct answer: B — Diffusion is the process in which oxygen moves from the lungs into the bloodstream.
The correct answer is B. Diffusion is the process where molecules move from an area of higher concentration to an area of lower concentration. In the context of the lungs, oxygen moves from the alveoli in the lungs to the bloodstream through diffusion. Choice A is incorrect as osmosis involves the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration. Choice C is incorrect because dissipation does not refer to a specific biological process related to molecule movement. Choice D is incorrect as reverse osmosis is a process where solvent moves from an area of high solute concentration to an area of low solute concentration, not the movement of molecules within a solution.
Question 5
The shimmering image of water seen on a hot road is a well-known example of:
A. Reflection
B. Refraction
C. Interference
D. Polarization
Show answer and rationale
Correct answer: B — Refraction
The shimmering image of water seen on a hot road is a result of refraction, not reflection. Refraction is the bending of light as it passes from one medium to another of different optical density. In this case, the hot air just above the road has a different density than the cooler air above it, causing light to bend and create the illusion of water on the road. Refraction is the most suitable explanation for this phenomenon, as it involves the bending of light rays due to the change in the medium's optical density, producing the visual effect observed on the hot road. Reflection, interference, and polarization do not involve the bending of light due to changes in optical density and are not applicable to the scenario described on the hot road.
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Question 6
Which type of cartilage allows for smooth movement at joints and absorbs shock?
A. Hyaline cartilage
B. Fibrocartilage
C. Elastic cartilage
D. None of the above
Correct answer:
Fibrocartilage is the correct answer. It is found in areas requiring both support and resilience, such as the intervertebral discs and knee joints. Fibrocartilage contains collagen fibers for strength and proteoglycans for resilience, making it suitable for functions that involve smooth movement at joints and shock absorption. Hyaline cartilage, while providing structural support, is not primarily responsible for smooth movement and shock absorption. Elastic cartilage is more flexible and is found in locations like the ear and epiglottis, but it is not known for its shock-absorbing properties. Choosing 'None of the above' disregards the correct option of fibrocartilage, which is specifically designed for the functions described in the question.
What is the correct way to represent 8,600,000,000,000 in scientific notation with two significant figures?
A. 8.6 x 10^12
B. 8.6 x 10^-12
C. 8.6 x 10^11
D. 8.60 x 10^12
Correct answer:
The correct way to represent 8,600,000,000,000 in scientific notation with two significant figures is 8.6 x 10^12. Scientific notation involves expressing a number as a decimal (with one non-zero digit before the decimal point) multiplied by a power of 10. In this case, 8,600,000,000,000 is correctly written as 8.6 x 10^12 to maintain two significant figures and the appropriate magnitude. Choice B (8.6 x 10^-12) is incorrect as it represents a very small number due to the negative exponent. Choice C (8.6 x 10^11) is incorrect as it does not account for the magnitude of the original number. Choice D (8.60 x 10^12) is incorrect because it unnecessarily adds a zero after the decimal point, which is not warranted by the original number's precision.
In endocrine regulation, the feedback loop is a critical concept. In a negative feedback loop, high levels of a hormone can result in:
A. Further stimulating the release of the same hormone
B. Inhibiting the release of the hormone or its production
C. Having no effect on the hormone's regulation
D. Increasing the need for another hormone entirely
Correct answer:
In a negative feedback loop, high levels of a hormone will inhibit the release of the hormone or its production. This mechanism is crucial for maintaining homeostasis by preventing excessive levels of hormones in the body. When a hormone reaches a certain concentration, it triggers the body to decrease its production or release, thereby ensuring a balance within the system. Choice A is incorrect because a negative feedback loop aims to counteract high hormone levels, not further stimulate them. Choice C is incorrect as high hormone levels do have an effect by triggering the feedback loop. Choice D is incorrect as the negative feedback loop operates within the same hormone system rather than increasing the need for an entirely different hormone.
Which of the following colligative properties refers to the elevation of the boiling point of a solution?
A. Freezing point depression
B. Vapor pressure lowering
C. Osmotic pressure
D. Boiling point elevation
Correct answer:
The correct answer is D, 'Boiling point elevation.' Boiling point elevation is a colligative property that describes the increase in the boiling point of a solvent when a non-volatile solute is added to it. This occurs because the presence of solute particles in the solvent lowers the vapor pressure of the solution, requiring a higher temperature to reach the same vapor pressure as the pure solvent. Choices A, B, and C are incorrect. Freezing point depression refers to the lowering of the freezing point of a solution, vapor pressure lowering is the reduction in vapor pressure due to the presence of solute particles, and osmotic pressure is the pressure required to prevent the flow of solvent molecules across a semipermeable membrane in osmosis.
The process by which two or more species reciprocally influence each other's evolution through selection pressures exerted on one another is called:
A. Convergent evolution
B. Divergent evolution
C. Coevolution
D. Coevolution
Correct answer:
A) Convergent evolution refers to the process by which unrelated species evolve similar traits due to similar environmental pressures. This does not involve reciprocal influence between species.
B) Divergent evolution refers to the process by which two or more related species become more dissimilar over time due to different selection pressures. This also does not involve reciprocal influence between species.
C) Coevolution is the process by which two or more species reciprocally influence each other's evolution through selection pressures exerted on one another. This can lead to a close ecological relationship between the species, such as in predator-prey interactions or mutualistic relationships.
D) This option is a duplicate of option C.
Not all cells in the pancreas secrete insulin because of the hormone somatostatin, which inhibits the release of insulin by all cells. What type of intercellular chemical signal does this illustrate?
A. Autocrine
B. Neuromodulator
C. Paracrine
D. Pheromone
Correct answer:
The correct answer is C: Paracrine. Somatostatin acts in a paracrine manner by inhibiting the release of insulin from nearby cells within the pancreas. Paracrine signaling involves the secretion of signals that act on neighboring cells, as seen in this scenario where somatostatin affects nearby pancreatic cells without entering the bloodstream or affecting distant cells. Autocrine signaling involves cells responding to substances they themselves release, which is not the case here. Neuromodulators are chemicals that modulate the activity of neurons, not directly related to this scenario. Pheromones are chemicals released into the environment to communicate with individuals of the same species, not relevant to the signaling within the pancreas.
What are the four main types of macromolecules that are essential for life?
A. Carbohydrates, lipids, proteins, and nucleic acids
B. Carbohydrates, proteins, fats, and vitamins
C. Minerals, vitamins, proteins, and fats
D. Carbohydrates, lipids, proteins, and hormones
Correct answer:
The correct answer is A: Carbohydrates, lipids, proteins, and nucleic acids. These four types of macromolecules are essential for life as they serve crucial roles in various cellular processes. Carbohydrates are the primary energy source for cells and provide structural support. Lipids function as energy storage molecules and are essential components of cell membranes. Proteins have diverse functions in cellular processes, acting as enzymes, structural components, and more. Nucleic acids, like DNA and RNA, carry genetic information and are crucial for protein synthesis. Choices B, C, and D are incorrect because they include elements like fats, vitamins, minerals, and hormones, which are not the main types of macromolecules essential for life.
Which of the following is responsible for maintaining homeostasis in the body?
A. Brainstem
B. Hypothalamus
C. Medulla oblongata
D. Cerebrum
Correct answer:
The correct answer is the Hypothalamus (choice B). The hypothalamus plays a crucial role in maintaining homeostasis by regulating various bodily functions such as hunger, thirst, body temperature, and sleep cycles. While the brainstem (choice A) is involved in basic life functions like breathing and heart rate, it is not primarily responsible for maintaining homeostasis. The medulla oblongata (choice C) is part of the brainstem and controls vital autonomic functions like breathing and heart rate, but it is not the main regulator of homeostasis. The cerebrum (choice D) is responsible for higher brain functions such as thinking, memory, and voluntary movement, but it is not directly involved in maintaining overall bodily balance or homeostasis.
Where is the energy for most cellular processes produced?
A. Nucleus
B. Cytoplasm
C. Mitochondria
D. Ribosomes
Correct answer:
The correct answer is C: Mitochondria. The energy for most cellular processes is produced in the mitochondria through the process of cellular respiration. Mitochondria are often referred to as the powerhouse of the cell because they generate ATP, the energy currency of the cell. This process involves the breakdown of glucose molecules to produce ATP, which fuels various cellular activities. Choices A, B, and D are incorrect. The nucleus is responsible for storing genetic material and controlling cell activities, not energy production. The cytoplasm is where various cellular activities take place, but it is not the primary site for energy production. Ribosomes are involved in protein synthesis and do not generate energy for cellular processes.
What characteristic unites all organisms in the kingdom Animalia?
A. Multicellularity and heterotrophy
B. Unicellular nature
C. Photosynthesis
D. Cell walls made of chitin
Correct answer:
A) Multicellularity and heterotrophy: This is the correct answer because all organisms in the kingdom Animalia are multicellular (composed of multiple cells) and exhibit heterotrophy (obtain nutrients by consuming other organisms).
B) Unicellular nature: This is incorrect because organisms in the kingdom Animalia are multicellular, not unicellular.
C) Photosynthesis: This is incorrect because organisms in the kingdom Animalia do not perform photosynthesis; they are heterotrophs that obtain nutrients by consuming other organisms.
D) Cell walls made of chitin: This is incorrect because organisms in the kingdom Animalia do not have cell walls made of chitin. Chitin is a structural polysaccharide found in the cell walls of fungi, not animals.
ATI TEAS 7 science practice questions, set 32 for nursing students in the United States. Fifteen items. Five include answers and rationales in American English.
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