Scelta multipla
If complementary DNA strands were arranged in a parallel manner instead of the usual antiparallel orientation, which of the following would most likely occur?
172
views
7. DNA and Chromosome Structure
DNA Structure
Scelta multipla
Why does DNA need to be coiled within the cell nucleus?
A
To efficiently package the long DNA molecules so they fit inside the nucleus
B
To prevent the DNA from being transcribed into RNA
C
To increase the rate of DNA replication by exposing more bases
D
To allow DNA to leave the nucleus and enter the cytoplasm
Guida verificata passo dopo passo1
Understand the physical size of DNA molecules: DNA strands are extremely long molecules, often stretching several centimeters if fully extended, which is much larger than the size of the cell nucleus.
Recognize the spatial limitation: The cell nucleus is microscopic, so DNA must be compacted to fit inside this small space without tangling or damage.
Learn about DNA packaging: DNA coils around proteins called histones, forming nucleosomes, which further coil and fold into higher-order structures, efficiently packaging the DNA.
Consider the functional reason: This packaging allows the DNA to be organized and protected, while still accessible for processes like transcription and replication when needed.
Evaluate the incorrect options: DNA is not coiled to prevent transcription, increase replication rate by exposing bases, or to leave the nucleus; rather, coiling primarily serves to compact the DNA to fit inside the nucleus.
Video correlati
Pratica correlata
