Which is true of hydroxide ions?

a.) they contain two hydrogen atoms

b.) they are not found in pure water

c.) they dissociate to form protons

d.) they have a negative charge

During recombinant dna technology which structure is used to cut the dna at a specific site? restriction enzymes dna ligase dna helicase vector plasmid

In which structure does photosynthesis occur in the plant cell

Photosynthesis and carbon fixation can only occur in the presence of light. true or false

What happens when molten material travels along the underside of the crust? A. It rises up towards the crust. B. It cools and sinks towards the core. C. Lava travels away from the core and heats up. D.

Is it possible to get any transcription of the lac operon in the absence of lactose? Why or why not? Yes, because although the repressor protein keeps transcription at a very low basal level, some transcripts will be produced and translated.

Which molecule is synthesized by plants and is a major source of energy for plants and animals?

A biology student wants to understand how blood flows through the aorta. To model the heart and aorta, she sets up two identical pressure-controlled tanks that push blood through a 2-centimeter diameter tube. Her results are shown in the table below.

Which characteristic should describe all evidence collected by a scientis

What macromolecule is the primary energy source for organisms?

What is the difference between diploid and haploid cells?