after several cycles of cell division, a fertilized cell develops into a hollow ball of cells called a

Scientists tried inserting the jellyfish gene that codes for luminescence into bacteria. Not all bacteria where transformed. Which bacteria were transformed? Only the bacteria that do not glow in the dark were transformed.

Ben will be conducting an experiment in which he reacts metals with different concentrations of acid in test tubes.

Which statement OR statements are true about groups on the periodic table? Elements in the same group have similar properties and react the same Elements in the same group have the same number of energy levels Groups are also called families

Mosquitoes in tropical regions can carry and transmit the malaria parasite to humans. The mosquitoes used to be killed in these regions by spraying them with the insecticide DDT.

What is the basic unit of life

What organic substance cuts DNA into different sized fragments?

Which requirement is essential for many of chemical process that occur in cells to take place

A 200 - gram sample of a radioactive nuclide is left to decay for 30 hours. At the end of 30 hours only a 100 g of the sample is left. What is the half life of the nuclide sample

How can I measure the ripeness of a banana through sugar content or softness for my science experiment?

Which species is this butterfly? Mystery butterfly 3 Butterfly dichotomous key A. Papilio glaucus B. Papilio polyxenes C. Danaus plexippus D. Colias philodice