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Why was the experiment on DNA done by Meselson and Stahl strong evidence that DNA replication is semi-conservative?

Three theories for DNA replication at the time: Conservative replication: When DNA was replicated, entirely new molecules of DNA were made, meaning a newly replicated DNA molecule would be composed entirely ...
PB
Answered by Patricia B. • Biology tutor
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How do negative and positive feedback loops occur and how are they different?

Think of them as a flow chart. Stimulus (a change) | Sensor (detects the change) | Control (sends a signal about the change) | Effector (response to the change) (connect a line to Stimulus) Negative feedback...
EC
Answered by Emma C. • Biology tutor
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How do you prove the formula for the sum of n terms of an arithmetic progression?

An arithematic progression has terms in a sequence such that the difference between any two consecutive terms is a constant and is given by a common difference, say, d. If first term in the progression is a,...
NB
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Explain the possible causes of deflation in an economy. (15 Marks)

It is first necessary to define deflation. Deflation is a reduction in the general level of prices in an economy. It can be measured by indices such as the Consumer Price Index (CPI) which takes the price of...
TD
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Describe the process of protein synthesis.

A copy of the gene to be coded in DNA is made from messenger RNA (mRNA). mRNA travels out of the nucleus and attaches to a ribosome. The ribosome joins amino acids together in the order determined by mRNA.
AT
Answered by Arjun T. • Biology tutor
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