Answer the following questions true (T) or false (F)
1. A nucleotide with a single cyclic ring structure is a pyrimidine.
2. Denaturation of a protein is always permanent.
3. The valence of an atom is determined by the total number of electrons it contains.
1. TRUE
2. FALSE
3. FALSE
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Both prokaryotic and eukaryotic cells use ________ to turn certain genes on or off.
Characteristics of which virus consist of a double-stranded genome and virions that appear as oval, brick-shaped structures of 200 to 400 nm in length? In addition, the World Health Organi-zation (WHO) eradicated this virus in 1980
a. Cowpox b. Chicken pox c. Swinepox d. Smallpox
Which aquatic biome often has reduced nitrogen levels, and therefore more carnivorous plants?
a. Bogs b. Rivers and streams c. Lakes and ponds d. Estuaries
The coding regions of a gene are called
A) introns. B) exons. C) promoters. D) enhancers.