Top answers

Biology
A Level

What is the difference between vertical and horizontal transmission of antibiotic resistance between bacteria?

Vertical transmission occurs during asexual reproduction. During the cell cycle, a bacterium will replicate its DNA (found in the form of a circular plasmid) which will contain the gene for antibiotic res...

AA
Answered by Annabelle A. Biology tutor
16366 Views

How can I find the frequency of genotype Bb in a population given that the frequency of BB is 0.49? (Where B = dominant allele, b = recessive allele on the same gene).

The proportion of the population with genotype Bb can be calculated using the two equations of the Hardy-Weinberg principle. These equations are: p + q = 1  where: p = frequency of the do...

CA
Answered by Caitlin A. Biology tutor
7260 Views

Why do enzymes stop working at high temperatures?

Enzymes are biological catalysts. This means they spead up chemical reactions in the body. To understand why they might stop working, you must first look at the structure. Enzymes are proteins made up of ...

CM
Answered by Caitlin M. Biology tutor
26916 Views

Using the nitrogen cycle, explain how nitrogen from the atmosphere is converted into nitrates

4 main processes: ammonification nitrification nitrogen fixation denitrification NITROGEN FIXATION: the process by which N2 gas converted --> nitrogen containing compo...

NZ
Answered by Nawal Z. Biology tutor
7117 Views

How is blood in the veins returned to the heart?

This question requires understanding about how blood flows in the veins. The body contains three types of blood vessel: artery, vein and capillaries, each with different characteristics. Veins carry deoxy...

GB
Answered by Grace B. Biology tutor
13999 Views

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