Nokea
A hypertonic solution has what concentration of solutes compared to the cell?
- A. Same.
- B. Negative.
- C. Lower.
- D. Higher.
Correct Answer: D
Rationale:
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Why is DNA important for metabolic activities of the cell?
- A. It initiates cellular mitosis.
- B. It provides cell wall stability.
- C. It increases glucose absorption.
- D. It controls the synthesis of enzymes.
Correct Answer: D
Rationale: DNA is crucial for metabolic activities as it contains the genetic information needed for the synthesis of enzymes, which are essential for various metabolic reactions within the cell. Enzymes are biological catalysts that regulate and speed up chemical reactions, allowing the cell to carry out necessary metabolic processes efficiently. Therefore, DNA's role in controlling enzyme synthesis directly impacts the cell's metabolic activities, making option D the correct answer.
How does a bacterium reproduce?
- A. Mitosis
- B. Meiosis
- C. Binary fission
- D. Cytokinesis
Correct Answer: C
Rationale: Bacteria reproduce through binary fission, a process in which a single bacterium divides into two identical daughter cells. Mitosis and meiosis are processes specific to eukaryotic cells, not bacteria. Cytokinesis is the final step of the cell cycle where the cytoplasm divides, but it is not the primary reproductive method for bacteria.
What structure in a plant cell is surrounded by a double membrane and contains most of the genetic information used to control the cell?
- A. Mitochondrion
- B. Nucleus.
- C. Chromatin.
- D. Chromosome.
Correct Answer: B
Rationale: Rationale: The correct answer is B: Nucleus. The nucleus is surrounded by a double membrane and contains most of the genetic information in the form of DNA, which controls the cell's activities. Mitochondria (A) are involved in energy production, chromatin (C) is a complex of DNA and proteins within the nucleus, and chromosomes (D) are condensed structures of DNA found in the nucleus during cell division. Therefore, the nucleus is the structure that fits the description provided in the question.
What type of bond bonds one molecule of water with another molecule of water?
- A. Ionic
- B. Covalent
- C. Hydrogen
- D. Molecular
Correct Answer: C
Rationale: Two molecules of water are bonded through hydrogen bonding. This type of bond forms between the slightly positive hydrogen atom in one water molecule and the slightly negative oxygen atom in another water molecule. Hydrogen bonds are weaker than covalent bonds but are essential in various biological processes and properties of water, contributing to its unique characteristics like high surface tension, cohesion, and adhesion.
Which of the following is not an RNA base?
- A. Adenine
- B. Thymine
- C. Uracil
- D. Cytosine
Correct Answer: B
Rationale: In RNA, the bases are Adenine, Uracil, and Cytosine. Thymine is uniquely found in DNA and not RNA. Adenine pairs with Uracil, while Cytosine pairs with Guanine in RNA. Thus, Thymine is not an RNA base, making it the correct answer.