In researching the structure of DNA, Erwin Chargaff found the amount of adenine always equaled the amount of which other base?

A. thymine

B. cytosine

C. adenine

D. uracil

Which pressure system is linked to the Sahara Desert? a) subtropical high b) polar front c) equatorial low d) polar high e) subpolar low

How has man negatively impacted the tundra biome

Which best explains the relationship between the speed and energy of an object? A) As an object's speed increases, its energy increases. B) As an object's speed decreases, its energy increases. C) As an object's speed increases, its energy decreases.

U. S. health officials are considering different ways of preparing for a future worldwide epidemic of human influenza caused by the H5N1 virus (also known as avian flu). What action would NOT be useful in preventing a future influenza epidemic? A.

Tobacco mosaic virus has rna rather than dna as its genetic material. in a hypothetical situation where rna from a tobacco mosaic virus is mixed with proteins from a related dna virus, the result could be a hybrid virus.

The ___ ventricle pumps blood to the pulmonary circuit, while the ___ ventricle pumps blood into the systemic circuit.

In what ways are mosses liverworts in the hornworts words similar

Carbon-14 has a half life of 5,770 years. A fossil was found that had 1/32 of its original Carbon-14 remaining. How old is the fossil?

Why are many trials taken and averaged in an experiment?

Northern flickers are woodpeckers of the eastern United States. Males, but not females, have black feathers that resemble a moustache extending from the bill along each side of the head.