Practice mode / Biology What are autophagosomes? A Option A: Those lysosomes which eat parts of their own cells to generate energy. B Option B: Lysosomes which help in extracellular digestion C Option C: Those lysosomes which eat old and worn out cellular organelles. D Option D: Both a and b Correct answer D. Both a and b Explanation Autophagosomes are lysosomal vacuoles that digest parts of the cell's own cytoplasm, such as old and worn out organelles, recycling materials and releasing energy when needed. Show answer Report a problem Answer checked 11 October 2026 · How we write and check questions
Question 01 / Biology How many cervical vertebrae are there? A Option A: 5 B Option B: 9 C Option C: 7 D Option D: 12 Correct answer C. 7 Show answer Open question
Question 02 / Biology Which category of animal is the hummingbird an example of? A Option A: Ectotherm B Option B: Heterotherm C Option C: Cold-blooded animal D Option D: Endotherm Correct answer B. Heterotherm Show answer Open question
Question 03 / Biology Cellulose is the main component of which part of a plant cell? A Option A: Middle lamella B Option B: Primary wall C Option C: Secondary wall D Option D: All of the above Correct answer B. Primary wall Show answer Open question
Question 04 / Biology Which organism converts ammonia or ammonium ions into nitrites in the nitrogen cycle? A Option A: Rhizobium B Option B: Pseudomonas C Option C: Nitrosomonas D Option D: Nitrobacter Correct answer C. Nitrosomonas Show answer Open question
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