Science

Science Related

Review Science related questions and content

What is the term given to the sequence of nucleotides that contains the information to make a specific protein molecule?

  • A. Gene
  • B. Locus
  • C. Promoter
  • D. Operator
Correct Answer: A

Rationale: The correct answer is A: Gene. A gene is the term used to describe the sequence of nucleotides that contains the information necessary to synthesize a specific protein molecule. Genes act as the fundamental units of heredity and provide the instructions for building proteins, which play crucial roles in various biological processes within an organism. In contrast, a locus refers to the specific position or location of a gene on a chromosome. Promoter is a regulatory region of DNA that initiates the transcription process for a particular gene, while an operator is a DNA segment that interacts with a repressor protein to modulate the expression of neighboring genes.

You may also like to solve these questions

Which of the following is an example of a biological macromolecule?

  • A. Monosaccharide
  • B. Protein
  • C. Nucleic acid
  • D. Amino acid
Correct Answer: B

Rationale: The correct answer is B, 'Protein.' Proteins are biological macromolecules composed of amino acid chains. They play vital roles in cellular functions, including catalyzing reactions, providing structural support, and acting as signaling molecules. Monosaccharides are simple sugars, nucleic acids are genetic materials such as DNA and RNA, and amino acids are the fundamental units that make up proteins.

What causes osteoporosis?

  • A. An increase in osteocyte activity while osteoclast activity continues at expected levels
  • B. A decline in osteoblast activity while osteoclast activity continues at expected levels
  • C. An increase in osteocyte activity while osteoblast activity continues at expected levels
  • D. A decline in osteoclast activity while osteoblast activity continues at expected levels
Correct Answer: B

Rationale: Osteoporosis is a condition characterized by reduced bone density and mass, leading to brittle bones. Osteoblasts are cells responsible for forming new bone tissue, while osteoclasts break down old or damaged bone. In osteoporosis, there is a decrease in osteoblast activity, causing a net loss of bone as the breakdown surpasses formation. Meanwhile, osteoclast activity remains relatively stable. This imbalance between bone formation (osteoblast activity) and bone resorption (osteoclast activity) contributes to the development of osteoporosis by reducing bone strength and increasing susceptibility to fractures.

Where are the tibia and fibula located in the body?

  • A. Coxal
  • B. Antecubital
  • C. Crural
  • D. Tarsal
Correct Answer: C

Rationale: The tibia and fibula are located in the crural region of the body. The crural region, also known as the lower leg, is situated between the knee and the ankle. The tibia and fibula are the two bones found in this region and play a crucial role in the skeletal structure of the lower limb. The coxal region refers to the hip, the antecubital region is located at the front of the elbow, and the tarsal region pertains to the ankle area. Therefore, the correct answer is C, crural, as it specifically refers to the location of the tibia and fibula in the lower leg.

Which type of chemical reaction is exemplified by the following equation? 2HCl (aq) + Mg(OH)₂ (s) → 2H₂O (l) + MgCl₂ (aq)

  • A. Neutralization
  • B. Decomposition
  • C. Combustion
  • D. Synthesis
Correct Answer: A

Rationale: The given chemical equation represents a neutralization reaction. In this reaction, an acid (hydrochloric acid) reacts with a base (magnesium hydroxide) to form water and a salt (magnesium chloride). Neutralization reactions typically involve the combination of an acid and a base to produce a salt and water. Choices B, C, and D are incorrect as they do not accurately describe the reaction type demonstrated in the equation provided.

Which of the following structures is correctly associated with its immune function?

  • A. Bone marrow destroys worn out red and white blood cells.
  • B. Tonsils are where T-cells are generated and mature.
  • C. The spleen removes germs from the blood.
  • D. Peyer's patches are where B-cells are generated and mature.
Correct Answer: C

Rationale: The spleen is responsible for filtering blood and removing germs, making option C the correct association of structure and immune function.

Copyright © 2025 Nokea. All rights reserved.