ATI TEAS Version 7 - Science

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Free ATI TEAS Version 7 - Science Questions

1. Which of the following is an example of a chemical change?
  • Releasing compressed gas to make a bottle-rocket launch
  • Adding water to clay to make slip
  • Crystallizing honey to make candy
  • Including baking soda in a recipe to make it less sour

Explanation

d. Including baking soda in a recipe to make it less sour:
This represents a chemical change because baking soda reacts with acids in the food (such as vinegar or buttermilk) to produce carbon dioxide gas. This reaction forms new substances and cannot be easily reversed, which is the defining feature of a chemical change.
2. Fertilization (the fusing of one sperm and an ovum) results in a(n) _____ .
  • Embryo
  • Fetus
  • Infant
  • Zygote

Explanation

A zygote is the first cell formed when a sperm cell unites with an ovum (egg) during fertilization. It contains a complete set of 46 chromosomes—23 from the mother and 23 from the father—combining genetic material to form a unique organism. The zygote undergoes rapid cell division (cleavage) and eventually develops into an embryo as it moves down the fallopian tube toward the uterus for implantation.
3.

Which of the following physiological responses is caused by the release of anti-diuretic hormone

  •  Increase in the concentration of calcium in the glomerulus

  • Decrease in water reabsorption in the collecting duct

  • Increase in water reabsorption in the collecting duct

  • Decrease in the concentration of calcium in the glomerulus

Explanation

Correct Answer C. Increase in water reabsorption in the collecting duct

Explanation:

Anti-diuretic hormone (ADH), also known as vasopressin, is released by the posterior pituitary gland in response to dehydration or increased blood osmolality. Its primary action is on the kidneys, specifically the collecting ducts, where it increases the permeability of the duct walls to water. This leads to greater water reabsorption into the bloodstream, concentrating the urine and conserving body water. As a result, urine volume decreases, and blood volume and pressure are maintained.

Why Other Options Are Wrong:

A. Increase in the concentration of calcium in the glomerulus

ADH does not influence calcium levels in the glomerulus. Calcium balance is regulated primarily by parathyroid hormone and vitamin D, not ADH.

B. Decrease in water reabsorption in the collecting duct

This is the opposite of ADH’s effect. ADH promotes water reabsorption, not a decrease. A lack of ADH would lead to decreased water reabsorption, causing dilute urine.

D. Decrease in the concentration of calcium in the glomerulus

Again, calcium concentration in the glomerulus is not directly affected by ADH. This is regulated through other hormonal and renal mechanisms unrelated to water reabsorption.


4. What is the function of the neuromuscular junction?
  • To connect muscle fibers to motor neurons
  • To bind acetylcholine to nAChRs
  • To depolarize the muscle cell membrane
  • To activate voltage-gated sodium channels on the muscle membrane

Explanation

The neuromuscular junction (NMJ) is the specialized synapse where a motor neuron connects to a muscle fiber. Its primary function is to transmit signals from the nervous system to the muscle, triggering contraction. When an action potential reaches the NMJ, it causes the release of acetylcholine, initiating the events that lead to muscle contraction.
5. Which of the following represents the first line of defense to an intruding pathogen?
  • Adaptive immunity
  • Antibodies
  • Innate immunity
  • T cells

Explanation

Innate immunity is the body’s first line of defense against pathogens. It includes physical barriers such as the skin and mucous membranes, chemical defenses like stomach acid and enzymes in saliva, and cellular responses such as phagocytosis by macrophages. This system acts quickly and non-specifically to prevent infection before the adaptive immune system is activated.
6. Which of the following is a function of the respiratory system? A. Transport of nutrients to the body B. Pumping of blood to the lungs C. Exchange of gases between the body and the environment D. Digestion of food in the stomach
  • Transport of nutrients to the body
  • Pumping of blood to the lungs
  • Exchange of gases between the body and the environment
  • Digestion of food in the stomach

Explanation

The respiratory system is responsible for the exchange of gases, primarily oxygen (O₂) and carbon dioxide (CO₂), between the body and the external environment. When air enters the lungs, oxygen diffuses across the alveolar membranes into the bloodstream, while carbon dioxide diffuses from the blood into the alveoli to be exhaled. This gas exchange is essential for cellular respiration, which provides energy for body functions.
7. Which factor is primarily responsible for the movement of water across cell membranes in osmosis?
  • Hydrostatic pressure of the solution
  • Concentration of solute particles in the solution
  • Temperature of the solution
  • Kinetic energy of liquid water molecules

Explanation

In osmosis, water moves across a semipermeable membrane from an area of low solute concentration (high water concentration) to an area of high solute concentration (low water concentration). This movement continues until equilibrium is reached. The difference in solute concentration across the membrane creates the osmotic gradient that drives water movement.
8. After food has been masticated in the oral cavity, where does it go next? A. Colon B. Liver C. Pancreas D. Pharynx
  • Colon
  • Liver
  • Pancreas
  • Pharynx

Explanation

After mastication (chewing) in the oral cavity, food is formed into a bolus and pushed to the back of the mouth by the tongue during swallowing. It then enters the pharynx, a muscular passage that serves as a common pathway for both the respiratory and digestive systems. From the pharynx, the food passes into the esophagus, which propels it toward the stomach via peristaltic movements.
9. The physical appearance or _____ of an organism is determined by a set of alleles. A. Genotype B. Phenotype C. Transcription D. Translation
  • Genotype
  • Phenotype
  • Transcription
  • 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.
10. What is the name of the dome-shaped muscle that plays a key role in breathing?
  • Diaphragm
  • Trachea
  • Bronchus
  • Alveoli

Explanation

The diaphragm is a large, dome-shaped muscle located beneath the lungs that is essential for breathing. During inhalation, the diaphragm contracts and flattens, increasing the thoracic cavity’s volume and allowing air to flow into the lungs. During exhalation, it relaxes and moves upward, reducing the thoracic cavity’s volume and pushing air out. This rhythmic movement is controlled by signals from the phrenic nerve and forms the primary mechanism for respiration.

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