ATI TEAS Version 7 - Science

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Free ATI TEAS Version 7 - Science Questions

1. Which of the following best describes the difference between isotonic and isometric muscle contractions? A. Isotonic contractions produce no movement while isometric contractions produce movement. B. Isotonic contractions produce movement while isometric contractions produce no movement. C. Isotonic contractions generate tension in the muscle while isometric contractions involve shortening of the muscle fibers. D. Isotonic contractions involve contraction of individual muscle fibers while isometric contractions involve the entire muscle.
  • A. Isotonic contractions produce no movement while isometric contractions produce movement.
  • B. Isotonic contractions produce movement while isometric contractions produce no movement.
  • C. Isotonic contractions generate tension in the muscle while isometric contractions involve shortening of the muscle fibers.
  • D. Isotonic contractions involve contraction of individual muscle fibers while isometric contractions involve the entire muscle.

Explanation

Isotonic contractions occur when a muscle changes length while generating force, resulting in movement of a body part. For example, lifting a dumbbell in a bicep curl involves isotonic contraction — the biceps shorten (concentric phase) and then lengthen under tension (eccentric phase). Isometric contractions, on the other hand, generate muscle tension without changing the muscle’s length, meaning no joint movement occurs. An example is holding a plank position, where the muscles contract to maintain posture but do not move.
2.

Which of the following is the function of a totipotent cell

  • Fights infectious diseases

  • Develops into any kind of cell

  • Aids in the maturation of sex cells

  • Carries electrical impulses

Explanation

Correct Answer B. Develops into any kind of cell

Explanation:

A totipotent cell has the ability to develop into any type of cell in the body, including both the embryonic and extra-embryonic (placental) tissues. This is the most versatile type of stem cell, found in the earliest stages of embryonic development.

Why Other Options Are Wrong:

A. Fights infectious diseases

This is the function of certain immune cells, not totipotent cells.

C. Aids in the maturation of sex cells

This refers to specific cells in reproductive organs, not totipotent stem cells.

D. Carries electrical impulses

This describes neurons, which are specialized cells, not totipotent cells.


3. The physical appearance or _____ of an organism is determined by a set of alleles. A. Genotype B. Phenotype C. Transcription D. Translation
  • A. Genotype
  • B. Phenotype
  • C. Transcription
  • D. Translation

Explanation

The phenotype refers to the physical traits or observable characteristics of an organism, such as height, eye color, or flower color. It results from the interaction between the organism’s genotype (genetic makeup) and environmental factors. Different combinations of alleles in the genotype lead to variations in phenotype expression.
4. What solution has a pH of 7?
  • A. Aniline
  • B. Pyridine
  • C. Pure water
  • D. Sodium hydroxide

Explanation

Pure water has a neutral pH of 7 at 25°C because the concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻) is equal—both at 1 × 10⁻⁷ M. This balance means water is neither acidic nor basic. The neutrality of water makes it a standard reference point for the pH scale, which ranges from 0 (acidic) to 14 (basic).
5. Which of the following statements is true regarding vaccines? A. Vaccines can cause the disease they are designed to protect against B. Vaccines work by providing passive immunity to the individual C. Vaccines work by exposing the individual to a weakened or inactivated form of the pathogen D. Vaccines only provide protection against bacterial infections
  • A. Vaccines can cause the disease they are designed to protect against
  • B. Vaccines work by providing passive immunity to the individual
  • C. Vaccines work by exposing the individual to a weakened or inactivated form of the pathogen
  • D. Vaccines only provide protection against bacterial infections

Explanation

Vaccines stimulate the body’s immune system by introducing a weakened, inactivated, or part of a pathogen (such as a protein or antigen) without causing disease. This exposure triggers the immune system to produce antibodies and memory cells, providing active immunity. When the actual pathogen is encountered later, the immune system responds quickly, preventing illness. Vaccines are designed to safely build long-term protection.
6. What is the function of inflammatory cytokines released during the early response to bacterial infection?
  • A. Enhancing the phagocytosis of pathogens and disrupting the infection
  • B. Attacking invading pathogens
  • C. Initiating cell recruitment and local inflammation
  • D. Secreting antibodies to neutralize pathogens

Explanation

Inflammatory cytokines, such as interleukins (IL-1, IL-6) and tumor necrosis factor-alpha (TNF-α), are released early in bacterial infections to initiate local inflammation and recruit immune cells like neutrophils and macrophages to the infection site. This early signaling amplifies the immune response, helps contain the infection, and promotes tissue repair.
7.

Which of the following factors would have the least effect on the rate of a chemical reaction

  • The volume of the container

  • The concentration of the reactants

  • The temperature of the reaction

  • The pH of the solution

Explanation

Correct Answer A. The volume of the container

Explanation:

The volume of the container itself does not directly affect the rate of a chemical reaction unless it influences concentration or pressure. Reaction rate is more directly affected by factors such as concentration (which affects collision frequency), temperature (which affects kinetic energy), and pH (which can affect the activity of reactants or catalysts). Therefore, volume usually has the least direct impact on reaction rate.

Why Other Options Are Wrong:

B. The concentration of the reactants

Increasing concentration increases collision frequency, directly affecting reaction rate.

C. The temperature of the reaction

Higher temperatures increase molecular movement and collision energy, significantly affecting rate.

D. The pH of the solution

pH can alter the ionization state of reactants or enzymes, impacting reaction rates, especially in biochemical reactions.


8. Which example is part of the scientific method? A. A student reads about a new way to harness energy from the sun. B. A researcher studies the effects of car exhaust on how people breathe. C. A researcher analyzes how many plants respond well to a new fertilizer. D. A student discovers how insulin plays a role in the development of diabetes.
  • A. A student reads about a new way to harness energy from the sun.
  • B. A researcher studies the effects of car exhaust on how people breathe.
  • C. A researcher analyzes how many plants respond well to a new fertilizer.
  • D. A student discovers how insulin plays a role in the development of diabetes.

Explanation

The scientific method involves making observations, forming a hypothesis, conducting experiments, collecting data, and drawing conclusions. In this case, the researcher is performing an experiment by analyzing how plants respond to a new fertilizer—this involves collecting and interpreting data to test a hypothesis, which is a clear step in the scientific method.
9.

Which of the following events occurs during photosynthesis?

  • Breakdown of carbohydrates

  • Net increase in cellular ATP

  • Production of carbon dioxide

  • Release of oxygen

Explanation

Correct Answer:

Release of oxygen

Explanation:

During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen using light energy. This process occurs in the chloroplasts and involves splitting water molecules (H₂O) during the light-dependent reactions. The splitting of water releases oxygen gas (O₂) as a byproduct, which exits through the stomata of leaves. This is one of the most essential ecological contributions of photosynthesis.

Why Other Options Are Wrong:

Breakdown of carbohydrates

This is incorrect because photosynthesis produces carbohydrates (like glucose); their breakdown occurs during cellular respiration, not during photosynthesis.

Net increase in cellular ATP

This is incorrect because while ATP is generated temporarily during the light-dependent reactions, it is used immediately in the Calvin cycle. There is no net gain in ATP for the plant’s general use from photosynthesis.

Production of carbon dioxide

This is incorrect because carbon dioxide is not produced but consumed during photosynthesis. Plants take in CO₂ from the atmosphere to build carbohydrates.


10. What type of reaction is Cu (s) + 2AgNO₃ (aq) → 2Ag (s) + Cu(NO₃)₂ (aq)?
  • a. Single replacement
  • b. Double replacement
  • c. Synthesis
  • d. Decomposition

Explanation

a. Single replacement:
In this reaction, copper (Cu) displaces silver (Ag) from silver nitrate (AgNO₃), forming copper(II) nitrate (Cu(NO₃)₂) and solid silver. A single replacement reaction occurs when one element replaces another in a compound, producing a new element and a new compound.

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