what functional group is present in esters 5634585

ATI TEAS 7

Mometrix TEAS 7 science practice test

1. What functional group is present in esters?

A. Hydroxyl
B. Carbonyl
C. Ester
D. Amine

Correct answer: C

Rationale: The functional group present in esters is -COO-, which represents a carbonyl group bonded to an oxygen atom. This group is responsible for the characteristic fruity aroma of esters. Choice A, 'Hydroxyl,' refers to -OH, which is a characteristic group of alcohols, not esters. Choice B, 'Carbonyl,' is a broad term that includes various compounds with a C=O group, but specifically in esters, it is a carbonyl group bonded to an oxygen atom. Choice D, 'Amine,' refers to compounds containing a nitrogen atom bonded to hydrogen atoms or alkyl groups, which is not present in esters. Therefore, the correct answer is 'C: Ester.'

2. What does the phrase 'survival of the fittest' refer to?

A. Organisms with the most complex anatomical structures are more likely to survive and reproduce.
B. Organisms that demonstrate the best adaptations to their environment have a higher chance of survival and reproduction.
C. All organisms have an equal probability of survival and reproductive success regardless of their traits.
D. Only the strongest and most aggressive individuals within a population will survive and reproduce.

Correct answer: B

Rationale: The phrase 'survival of the fittest' is often associated with the concept of natural selection, proposed by Charles Darwin. Natural selection is the process by which organisms best adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to the next generation. This process does not necessarily favor the most complex anatomical structures (option A) or the strongest and most aggressive individuals (option D). Instead, it emphasizes the importance of adaptations that enhance an organism's ability to survive and reproduce in a specific environment. Option C is incorrect because natural selection results in differential reproductive success based on an organism's traits, meaning that not all organisms have an equal probability of survival and reproductive success.

3. Which of the following sentences best serves as the topic sentence in a paragraph about the history of yoga?

A. The word 'yoga' was mentioned in the Vedas, a collection of texts containing songs, mantras, and rituals used by Vedic priests.
B. By the late 1800s, yoga masters from India began to travel to the West, attracting followers.
C. After a few hundred years, yoga masters rejected the teachings of the ancient Vedas and embraced the physical body as the means to achieve enlightenment.
D. The practice of yoga first developed in the Indus-Sarasvati civilization in Northern India over 5,000 years ago.

Correct answer: D

Rationale: The correct answer is D because it introduces the historical origin of yoga, which is the main focus of the paragraph. This sentence sets the context by providing a foundational understanding of where and when yoga originated. Choice A talks about the mention of yoga in the Vedas but does not provide information about the historical development of yoga itself. Choice B discusses the travel of yoga masters to the West, which is a later development in the history of yoga and not the starting point. Choice C refers to a shift in yoga philosophy without directly addressing its origins, making it less suitable as a topic sentence compared to choice D.

4. Which of the following is an example of an aromatic hydrocarbon?

A. Ethane
B. Benzene
C. Propane
D. Butene

Correct answer: B

Rationale: Benzene is indeed an example of an aromatic hydrocarbon. Aromatic hydrocarbons are characterized by having a cyclic structure with alternating single and double bonds (pi bonds). Benzene fits this description, making it aromatic. On the other hand, ethane, propane, and butene are aliphatic hydrocarbons, which do not have the distinct cyclic structure of aromatic hydrocarbons. Ethane, propane, and butene are aliphatic hydrocarbons, which contain only single bonds and are not cyclic in nature. Therefore, they are not examples of aromatic hydrocarbons.

5. Choose the most appropriate word to complete the sentence: 'He was _____ about his upcoming presentation.'

A. apprehensive
B. bored
C. excited
D. relieved

Correct answer: A

Rationale: The correct answer is 'apprehensive.' In the context of an upcoming presentation, being apprehensive implies a sense of worry or nervousness. This aligns well with the situation where one might feel uneasy or concerned about their upcoming presentation. The word 'bored' (choice B) is incorrect as it does not convey the right emotion for this context. 'Excited' (choice C) and 'relieved' (choice D) do not match the expected sentiment of worry or nervousness associated with an upcoming presentation, making them incorrect choices.