Nokea
Select the two bases that are purines:
- A. A
- B. C
- C. T
- D. N
Correct Answer: A
Rationale: Purines are adenine (A) and guanine (G), which are the larger nitrogenous bases found in DNA and RNA. Adenine (A) is one of the purine bases, whereas cytosine (C) and thymine (T) are pyrimidines. Therefore, the correct answer is A. Option D, 'N,' is not a purine base.
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What part of a plant cell acts as a barrier and provides support to the cell?
- A. cell membrane.
- B. Xylem.
- C. chloroplast
- D. Cell wall.
Correct Answer: D
Rationale:
Lipids are better known as fats, but what are they specifically? (Select one that doesn't apply.)
- A. Fatty acids
- B. Phospholipids
- C. Ketones
- D. Steroids
Correct Answer: C
Rationale: Lipids are a diverse group of molecules that include fatty acids, phospholipids, and steroids. Ketones, while important in metabolism, are not typically classified under lipids. Ketones are produced during the breakdown of fatty acids or amino acids, but they are not themselves lipids. Therefore, option C, Ketones, is the correct answer as it does not specifically fall under the category of lipids.
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 first step in the process of respiration?
- A. Fermentation
- B. Krebs cycle
- C. Electron transport chain
- D. Glycolysis
Correct Answer: D
Rationale: The correct answer is Glycolysis. Glycolysis is the initial step in cellular respiration where glucose is broken down into pyruvate, producing a small amount of ATP and NADH in the cytoplasm. This step is crucial as it initiates the breakdown of glucose, setting the stage for further energy production in subsequent stages like the Krebs cycle and electron transport chain.
In a population of dogs, fur color is determined by two alleles: black (B) and tan (b). The black allele shows complete dominance. If a dog has tan fur, what is its genotype?
- A. BB
- B. Bb
- C. bb
- D. Not enough information
Correct Answer: C
Rationale: When a dog has tan fur, it indicates that it has two recessive alleles for tan fur, which is represented as bb. Since black (B) is dominant over tan (b), the genotype of a dog with tan fur must be bb.