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Review Biology related questions and content

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.

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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:

Which combination of cell cycle phase and descriptor is correct?

  • A. S phase - the cell synthesizes DNA and doubles its cytoplasm.
  • B. Interphase - the cell increases in mass and number of organelles to prepare for cell division.
  • C. G1 phase - the phase prior to the start of mitosis in which the cell continues to grow in size and make proteins.
  • D. G2 phase - the amount of chromosomes is doubled.
Correct Answer: C

Rationale:

How do animal cells divide during cytokinesis?

  • A. Contractile ring
  • B. Cell plate
  • C. Both
  • D. None of the above
Correct Answer: A

Rationale: Animal cells divide using a contractile ring during cytokinesis. The contractile ring is composed of actin and myosin filaments and contracts to pinch the cell into two daughter cells. In contrast, cell plate formation is a mechanism observed in plant cells, not animal cells. Therefore, the correct answer is the contractile ring.

Which is an example of the comet organizational hierarchy for a wolf?

  • A. Muscle tissue, blood cell, DNA, organ, circulatory system, wolf.
  • B. Circulatory system, DNA, muscle tissue, blood cell, heart, wolf.
  • C. Blood cell, organ, circulatory system, muscle tissue, DNA, wolf.
  • D. DNA, blood cell, muscle tissue, heart, circulatory system, wolf.
Correct Answer: D

Rationale:

Where does anaerobic respiration happen and why?

  • A. Animals; they require energy
  • B. Plants; they undergo photosynthesis
  • C. Bacteria; they inhabit environments with low oxygen levels
  • D. None of the above
Correct Answer: C

Rationale: Anaerobic respiration occurs in bacteria as they live in environments with low oxygen levels. In the absence of oxygen, bacteria resort to anaerobic respiration to produce energy. In contrast, animals and plants predominantly rely on aerobic respiration, which necessitates oxygen. Therefore, option C is correct as it accurately identifies the primary environment where anaerobic respiration takes place.

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