Which nucleotide bases are purines?

a. adenine & guanine

b. adenine & thymine

c. guanine & cytosine

d. cytosine& thymine

Everyone has two alleles for blood type. where do these two alleles come from?

1) What is a system of organ systems working together called? 2) What is a group of organs working together called?

When the antibiotic valinomycin is added to actively respiring mitochondria, several things happen: the yield of atp decreases, the rate of o2 consumption increases, heat is released, and the ph gradient across the inner mitochondrial membrane

A biologist used the Internet to contact scientists around the world to obtain information about declining amphibian populations. He was able to gather data on 936 populations of amphibians, consisting of 157 species from 37 countries.

Predict what will happen to a cell if its nucleus is damaged

Which molecule would be the most affected by limited nitrogen

Where does the energy come from to make ATP at the cloroplast

According to condensuon theory, the most important factor for the formation of our plant was

Which of the following are functions of lipids? Choose three correct answers. A. forming the exoskeletons of insects B. forming waxy leaf coverings C. forming bones and cartilage D. storing energy in fat cells E. forming cell membranes F.

The ability of the body to undergo prolonged whole body, large muscle activity is: