TEAS 7 Chemistry: Essential Practice for Success

ATI TEAS 7

Chemistry

1. What is the formula for calculating molarity?

A. M = n/V
B. M = n/L
C. M = mol/L
D. M = mol/dmÂ³

Correct answer: a

Rationale: All of these choices are equivalent to the original formula. The symbol "n" represents the number of moles of solute, and the symbol "V" represents the volume of the solution in liters. The symbol "L" is an abbreviation for "liters," and "dmÂ³" is an alternative way to represent liters.

2. Which of the following is the main organ responsible for storing energy?

A. Liver
B. Heart
C. Kidneys
D. Adipose tissue

Correct answer: D

Rationale: Rationale: - Adipose tissue, commonly known as body fat, is the main organ responsible for storing energy in the form of triglycerides. - The liver plays a role in energy metabolism by regulating glucose levels and storing glycogen, but its primary function is not energy storage. - The heart is a muscular organ responsible for pumping blood throughout the body and does not play a significant role in energy storage. - The kidneys are vital organs responsible for filtering blood and regulating fluid balance, but they are not primarily involved in energy storage.

3. Which phrase best describes the relationship between smart grid technologies and renewable energy integration?

A. Competitive and incompatible, hindering each other's effectiveness.
B. Neutral and independent, neither impacting nor relying on each other.
C. Complementary and synergistic, enhancing each other's functionality.
D. Substitutable and interchangeable, offering equivalent solutions.

Correct answer: C

Rationale: The passage highlights the mutually beneficial relationship between smart grids and renewables, with both working together to optimize integration.

4. What is the role of DNA in evolution?

A. It stores genetic information that can be passed on to offspring
B. It allows for mutations that can introduce new variations
C. It regulates the expression of genes that influence traits
D. All of the above

Correct answer: D

Rationale: Rationale: A) DNA stores genetic information that is passed on from parents to offspring through the process of reproduction. This genetic information contains instructions for the development and functioning of an organism. B) DNA can undergo mutations, which are changes in the genetic sequence. These mutations can introduce new variations in the DNA, leading to genetic diversity within a population. C) DNA plays a crucial role in regulating the expression of genes. Gene expression determines which proteins are produced in an organism, influencing its traits and characteristics. D) Therefore, DNA is involved in all of the above processes, making it a key factor in evolution by driving genetic variation, inheritance, and gene expression.

5. What is the name of the muscular ring that controls the passage of food from the esophagus to the stomach?

A. Pyloric sphincter
B. Cardiac sphincter
C. Ileocecal valve
D. Sphincter of Oddi

Correct answer: B

Rationale: The correct answer is B: Cardiac sphincter. The cardiac sphincter, also known as the lower esophageal sphincter, is the muscular ring located at the junction between the esophagus and the stomach. It controls the passage of food from the esophagus into the stomach by opening and closing to prevent reflux of stomach contents back into the esophagus. The other options are incorrect: A) The pyloric sphincter is located at the junction between the stomach and the small intestine, controlling the passage of food from the stomach into the small intestine. C) The ileocecal valve is located between the small intestine and the large intestine. D) The Sphincter of Oddi is located in the duodenum and regulates the flow of bile and pancreatic juice into the small intestine. Therefore, the correct answer is B because it specifically relates to the passage of food from the esophagus to the stomach.