Microbiology

Step 1: Identify the yeast used in bread-making.
S. cerevisiae, commonly known as baker's yeast, is used in bread-making as it ferments sugars to produce carbon dioxide, causing the bread to rise.
Step 2: Analyze the options.
Aspergillus is a genus of molds, not used for bread-making.
Streptobacillus is a genus of bacteria, not used in baking.
S.octosporus is not a yeast species used in bread-making.
Conclusion: The correct answer is (A) S. cerevisiae.

Step 1: Understand DNA forms.
B-DNA is the most common form of DNA and can be synthesized from RNA in processes such as reverse transcription.
Step 2: Analyze the options.
A-DNA, C-DNA, and Z-DNA are different structural forms of DNA but are not directly made from RNA.
B-DNA is the form that is most commonly synthesized from RNA during reverse transcription in certain organisms.
Conclusion: The correct answer is (B) B-DNA.