Which of the following is a pyrimidine base in DNA?

O

A. Adenine

O

B. Thymine

O

C. Guanine

O

D. Purine

There has been an increase in frequency and intensity of storms and hurricanes. true or false

A researcher examines the voltage across the inside of a neuron from a fish previously unknown to science. She places one electrode inside the cell and has a second electrode in the extracellular solution.

A common genetic mutation causes a decrease in the crossing of the nerves at the optic chiasm in cats. These cats are still able to function normally by crossing their eyes. Why do they have to make this behavioral change?

Which of these is not anexample of radiation? a. a floor heating vent sending warm air throughout a room. b. you stand in the sunshine and feel warm. c. your cat likes to sit in the window on cold, sunny days.

In Plant cells, what does the vacuole do?

What does sodium-potassium pump do?

Which scientist disproved the ideas of spontaneous generation

Many fault lines are obvious at the surface. How can the epicenter of an earthquake be located miles away from the fault line?

The harmless scarlet kingsnake has scales in a coloration and pattern resembling the scales of the dangerous coral snake. The scarlet kingsnake is using to avoid predation

Charles Darwin came up with the system we use to name and classify organisms. True False