When a base substitution mutation occurs, one nucleotide in a replicating dna sequence is substituted for another, which results in the production of a mutant strand of dna. the result of the mutation depends on how the substituted nucleotide base alters the string of amino acids coded by the mutant dna. the three types of base substitution mutations are nonsense mutations, missense mutations, and silent mutations. each type is defined by how it affects protein synthesis?

Plants that have reproductive structures called cones are?

Do the following statements describe actin, myosin, both of the proteins or neither of the proteins? (a) contains a binding site for calcium (b) found in the i band (c) exists in a globular (g) form and a filamentous (f) form (d) contains a binding site for atp (e) is a component of the thin filament (f) is a component of the thick filament

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas