Which class of fungi includes the common bread mold, Rhizopus stolonifer? MCQ with Answer and Explanation

Which class of fungi includes the common bread mold, Rhizopus stolonifer?
A. Basidiomycetes
B. Phycomycetes
C. Ascomycetes
D. Deuteromycetes
Answer: Option B
Solution (By JKSSB Mock Tests)
Rhizopus stolonifer belongs to the class Phycomycetes (or Zygomycetes). These fungi are characterized by a coenocytic (multinucleate, aseptate) mycelium and reproduce asexually by forming motile or non-motile spores in sporangia. Ascomycetes (sac fungi) have septate hyphae and produce ascospores in asci. Basidiomycetes (club fungi) produce basidiospores on basidia. Deuteromycetes are imperfect fungi lacking a known sexual stage.

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Practice More Biology Questions

Question #1
Which of the following statements about pollination is INCORRECT?
A. Zoophily involves animals.
B. Anemophily is pollination by wind.
C. Entomophily is pollination by insects.
D. Hydrophily occurs in terrestrial plants.

Correct Answer: Option D


Explanation:
Hydrophily is pollination by water and occurs in aquatic plants like Vallisneria and Zostera. Terrestrial plants do not use water for pollination. All other statements are correct.

This question belongs to: Science Biology
Question #2
Assertion (A): Mitochondria and chloroplasts are considered semi-autonomous organelles. Reason (R): They possess their own DNA and ribosomes, and can synthesize some of their own proteins.
A. Both A and R are true, and R is the correct explanation of A.
B. A is true, but R is false.
C. Both A and R are true, but R is not the correct explanation of A.
D. A is false, but R is true.

Correct Answer: Option A


Explanation:
Mitochondria and chloroplasts contain circular DNA and 70S ribosomes, enabling them to transcribe and translate some proteins independently, though they rely on nuclear genes for most proteins. This partial autonomy supports the endosymbiotic origin hypothesis. The presence of their own genetic material and protein synthesis machinery qualifies them as semi-autonomous. Thus, both assertion and reason are correct, and the reason correctly explains the assertion.

This question belongs to: Science Biology
Question #3
The enzyme responsible for joining the Okazaki fragments on the lagging strand during DNA replication is:
A. DNA primase
B. DNA ligase
C. DNA polymerase III
D. DNA helicase

Correct Answer: Option B


Explanation:
During DNA replication, the lagging strand is synthesized discontinuously in short segments called Okazaki fragments. After the RNA primers are removed and replaced with DNA by DNA polymerase I, the fragments remain separated by nicks in the sugar-phosphate backbone. DNA ligase is the enzyme that catalyzes the formation of phosphodiester bonds between these fragments, sealing the nicks and creating a continuous DNA strand.

This question belongs to: Science Biology