ATI TEAS 7
Chemistry
1. Which group of elements are known for their vibrant colors and use in fireworks?
- A. Noble gases
- B. Alkali metals
- C. Halogens
- D. Transition metals
Correct answer: D
Rationale: Transition metals exhibit diverse electronic configurations, leading to their ability to emit specific colors of light, making them ideal for fireworks.
2. Which of the following is NOT a part of the body's innate immune response?
- A. Physical barriers like skin and mucous membranes
- B. Phagocytes that engulf and destroy pathogens
- C. Inflammatory response to isolate and contain infection
- D. Production of antibodies specific to a particular pathogen
Correct answer: D
Rationale: The correct answer is D. The body's innate immune response is the first line of defense against pathogens, and it includes physical barriers like skin and mucous membranes (option A), phagocytes that engulf and destroy pathogens (option B), and the inflammatory response to isolate and contain infections (option C). The production of antibodies specific to a particular pathogen (option D) is part of the adaptive immune response, which develops over time and is not considered part of the innate immune system. Therefore, option D is not a component of the body's innate immune response.
3. How is power related to work and time?
- A. Power = Work ÷ Time
- B. Power = Work × Time
- C. Power = Work + Time
- D. Power = Work - Time
Correct answer: a
Rationale: Power is calculated as the amount of work done or energy transferred per unit of time.
4. The basic unit of communication in the nervous system is called a:
- A. Neuron
- B. Astrocyte
- C. Neurotransmitter
- D. Synapse
Correct answer: A
Rationale: The basic unit of communication in the nervous system is a neuron. Neurons are specialized cells that transmit information through electrical and chemical signals. They form complex networks to relay messages throughout the body. Astrocytes are support cells that help maintain the environment around neurons. Neurotransmitters are chemicals that transmit signals between neurons at synapses. A synapse is a junction between two neurons where communication occurs. However, the primary unit responsible for communication in the nervous system is the neuron, making it the correct answer.
5. Which element is a good conductor of electricity but is not a metal?
- A. Copper
- B. Silver
- C. Graphite
- D. Gold
Correct answer: C
Rationale: While metals are known for their conductivity, some non-metals like graphite also exhibit this property due to their unique electronic structure
6. How many bones are there in the adult human skeleton?
- A. 126
- B. 206
- C. 300
- D. 525
Correct answer: D
Rationale: The correct answer is D: 525. The adult human skeleton consists of 206 bones. However, when accounting for individual bones, many of them are paired (like the ribs and vertebrae), bringing the total count to 206 individual bones but 525 in total when considering pairs. This includes bones in the skull, spine, ribs, arms, hands, pelvis, legs, and feet. So, while there are 206 individual bones, the total number of bones in the adult human skeleton is 525 when considering pairs.
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