교과서 질문
A student was memorizing the arrangements of bacteria and noticed that there are more arrangements for cocci than for bacilli. Why might this be so?
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7. Prokaryotic Cell Structures & Functions
Bacterial Cell Morphology & Arrangements
객관식
Which of the following features contributes most directly to the compaction of the bacterial chromosome within the cell?
A
Supercoiling of DNA by topoisomerases
B
Formation of endospores
C
Attachment of ribosomes to the chromosome
D
Presence of a nuclear envelope
검증된 단계별 안내1
Understand that bacterial chromosomes are large DNA molecules that must be compacted to fit inside the small bacterial cell.
Recall that bacteria lack a nuclear envelope, so DNA compaction relies on other mechanisms.
Recognize that supercoiling is a process where DNA is twisted to reduce its spatial length, which is directly facilitated by enzymes called topoisomerases.
Note that formation of endospores and attachment of ribosomes do not contribute to DNA compaction; endospores are for survival, and ribosomes are for protein synthesis.
Conclude that the supercoiling of DNA by topoisomerases is the primary feature that compacts the bacterial chromosome within the cell.
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