Answer:
conservative replication model
Explanation:
In their experiment, Meselson and Stahl found that the DNA duplexes present after the first round of replication had intermediate density. This occurred since the semiconservative process of DNA replication of one DNA molecule (having both strands with 15N) forms two DNA duplexes each with one parental strand (15N) and one newly formed strand (14N).
If they had found two duplexes of two different density, this would have supported the conservative replication model. In this case, the DNA replication of the parent DNA molecule would have formed two DNA duplexes. One DNA molecule would have both the parental DNA strands with 15N while the other DNA duplex would have both newly formed strands with 14N.
Answer:
Endoplasmic reticulum
Explanation:
The endoplasmic reticulum is part of the endomembrane system inside almost all eukaryotic cells.
The membrane is continuous with the nuclear membrane. The endoplasmic reticulum is very important for modifying proteins and transporting them in vesicles to the Golgi body for further processing and transport to their final destinations.
The endoplasmic reticulum can be rough (have ribosomes attached) or smooth (lack ribosomes).
Two types of crust, the <span>thin oceanic crust that underlies the ocean basins, and the</span> continental crust that underlies the continents, which is thicker than the thin oceanic crust.
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Answer:
The levels, from smallest to largest, are: molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.
Answer:
I think the right option is D.