What components make up the backbone of DNA?

a

adenine & guanine

b

cytosine & thymine

c

phosphate & sugar

d

nitrogen base & sugar

Explain why you would use selective media instead of differential media to grow an organism? A) You want to determine biochemical and physiological characteristics. B) You want to determine biochemical characteristics, not cell wall type.

How do the circulatory and respiratory systems have to do with endurance in running?

A class of biology students conducted an experiment on ants. Each group was randomly assigned 20 ants. Each ant was placed halfway between food located down a dark-colored path and food located down a bright-colored path.

The most commonly used fuel for nuclear reactors is: 1. xenon 2. uranium 3. strontium 4. krypton

Why is the longest wavelength of the spectrum visable to the observer

In human body temperature is kept fairly constant by automatic responses controlled by

Which blood component makes up 41% of the blood's volume?

Which is the process used by the cell to rid itself of unwanted, large substances?

Which characteristics accurately describe earthworms? Check all that apply. segmented body containing setae open circulatory system gas exchange through gills complex nervous system sexual reproduction

One hypothesis for why obesity rates are high is the energy-thrifty gene hypothesis. According to this hypothesis, how did the environment our ancestors lived in differ from our present-day environmental in term s of food?