Nokea
Which base has two carbon rings?
- A. N
- B. C
- C. T
- D. G
Correct Answer: D
Rationale: The correct answer is G. In organic chemistry, the base Guanine (G) contains two carbon rings in its structure. Guanine is one of the four main nucleobases found in DNA and RNA. The other options, N, C, and T, do not have two carbon rings in their structures. Therefore, Guanine is the only option that fits the description of a base with two carbon rings.
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If the zygomatic arch is broken, where is the fracture located?
- A. Knee.
- B. Wrist.
- C. Cheek.
- D. Shoulder.
Correct Answer: C
Rationale:
What is the purpose of cellular respiration?
- A. Enable fermentation
- B. Produce enzymes
- C. Produce oxygen molecules
- D. Obtain energy in the form of ATP
Correct Answer: D
Rationale: The correct answer is D. The primary purpose of cellular respiration is to obtain energy in the form of ATP. During cellular respiration, glucose and other organic molecules are broken down to release energy in the form of ATP, which is crucial for various cellular functions and activities. This energy is used by cells to carry out processes such as growth, repair, movement, and maintaining homeostasis.
In binomial nomenclature, what is the second part of an organismÄ€™s scientific name?
- A. species
- B. phylum
- C. population
- D. kingdom
Correct Answer: A
Rationale: In binomial nomenclature, the scientific name of an organism consists of two parts: the genus name (first part) and the species name (second part). The second part, 'species,' helps differentiate between different organisms within the same genus. This specific naming system is critical for accurate identification and classification of organisms. Hence, the correct answer is 'species.'
Why does cellular respiration occur?
- A. Cells can copy DNA
- B. Cells can breathe
- C. Cells can convert nutrients to energy
- D. Cells can divide
Correct Answer: C
Rationale: Cellular respiration is the metabolic process in which cells convert nutrients, such as glucose, into energy in the form of ATP (adenosine triphosphate). This energy is crucial for the cell to perform its various functions and maintain life processes. Options A, B, and D do not accurately describe the purpose of cellular respiration, which is primarily about energy production to support cellular activities.
Which of the following statements about enzymes is not true?
- A. They catalyze reactions
- B. They raise the activation energy needed
- C. They have an active site
- D. They are typically proteins
Correct Answer: B
Rationale: Enzymes function to catalyze reactions by lowering the activation energy required for the reaction to occur. Therefore, the statement that enzymes raise the activation energy needed is incorrect. Enzymes have an active site where substrates bind and undergo catalysis. Enzymes are typically proteins that act as biological catalysts.