Top answers

How is DNA replicated?

DNA replication starts at an origin - eukaryotic chromosomes have multiple origins whereas prokaryotic chromosomes have only one. Here an enzyme called helicase separates the existing ("parental") ...
SA
Answered by Sarah A. • Biology tutor
3525 Views

An electron moving at 1000 m/s annihilates with a stationary positron. What is the frequency of the single photon produced?

The first thing to be aware of is that the frequency of a photon will depend on two things, its wavelength (c=fλ ) and its energy (E=hf). There is no information regarding the wavelength of the photon, but w...
LM
Answered by Lawrence M. • Physics tutor
2876 Views

Explain how Jay Gatsby personifies the American Dream

Jay Gatsby is a self-made man who pulled himself up out of poverty. However, despite having money, he can never quite fit in with those in East Egg - "old money" families - and meets a tragic end. ...
EM
Answered by Elena M. • English tutor
2013 Views

A cannon is fired at 30 degrees from the ground and the cannonball has initial velocity of 15 m/s. What is the height of the highest point the cannonball reaches and how far is this point horizontally from the cannon?

With this type of question always draw a diagram with the values on it. We can assume the positive direction is upwards. Start with considering the vertical motion and use SUVAT. s= ? (this is what we are lo...
EV
Answered by Elena V. • Physics tutor
9262 Views

How do I show two vectors are perpendicular?

Vectors can describe a line of particular length ("magnitude") and direction. The angle x between two vectors a and b can be found using the formula a.b = | a | | b | cosx. For the vectors to be pe...
SA
Answered by Sarah A. • Maths tutor
134401 Views