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Which genetic descriptor refers to an organism's actual appearance?
- A. Phenotype.
- B. Homozygote.
- C. Genotype
- D. Karyotype.
Correct Answer: A
Rationale:
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The structure of a bacteria is circular. Which bacteria fits this criteria?
- A. Mycobacterium.
- B. Actinomyces.
- C. Clostridium.
- D. Neisseria.
Correct Answer: C
Rationale: Rationale:
1. The correct answer is C: Clostridium.
2. Clostridium is a type of bacteria that has a circular structure known as a plasmid.
3. Plasmids are small, circular DNA molecules found in bacteria.
4. Mycobacterium (A) has a rod-shaped structure with a linear chromosome.
5. Actinomyces (B) has a filamentous structure, not circular.
6. Neisseria (D) has a diplococci shape, not circular.
In summary, Clostridium fits the criteria of having a circular structure due to its plasmid, making it the correct choice.
Skin cells undergo what type of cellular division?
- A. Melosis.
- B. Binary fission.
- C. Sexual reproduction.
- D. Mitosis.
Correct Answer: D
Rationale: The correct answer is D: Mitosis. Skin cells undergo mitosis, a type of cellular division where a parent cell divides into two identical daughter cells. During mitosis, the genetic material is equally distributed between the daughter cells to ensure genetic stability. Melosis (A) is incorrect as it refers to the type of cell division that occurs during sexual reproduction to produce gametes. Binary fission (B) is incorrect as it is a form of asexual reproduction seen in prokaryotes. Sexual reproduction (C) is incorrect as it involves the fusion of gametes from two different parents to produce genetically diverse offspring, not the division of existing cells like in skin cells. In summary, mitosis is the correct choice for skin cell division as it maintains genetic continuity and ensures tissue growth and repair.
Each species has a characteristic chromosome number and most of their cells have a complete set of these chromosomes. However, in the life cycle of humans, only sperm and eggs have which number of chromosomes?
- A. Diploid.
- B. Polyploid.
- C. Haploid.
- D. Monoploid.
Correct Answer: C
Rationale:
What structure in a plant cell acts as a barrier and provides support to the cell?
- A. Chloroplast
- B. Cell membrane
- C. Xylem
- D. Cell wall
Correct Answer: D
Rationale: The cell wall is the correct answer. It acts as a rigid barrier that surrounds the plant cell membrane, providing structural support and protection. Plant cells have cell walls, unlike animal cells, which give them their shape and rigidity.
What structure allows sperm cells to move?
- A. Centriole.
- B. Centrosome.
- C. Flagellum.
- D. Cilium.
Correct Answer: C
Rationale: