DNA and mRNA synthesis proceeds in the 5' to 3' direction. What do 5' and 3' refer to? a) The position of the phosphate and nitrogen bases

b) The number of carbons in the nitrogen base

c) The number of hydroxyl groups attached

d) The position of a carbon atom in the sugar backbone

Which of the following systems in absorbing oxygen and releases carbon dioxide

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

In tomato plants, mendel found that the allele for smooth seeds (s) is dominant, while the allele for wrinkled seeds (s) is recessive. which of these punnett squares shows crosses between two plants heterozygous for smooth seeds? i need this to be answered as soon as ! sry the picture is bad quality