In an experiment, the enzyme lactase is added to milk in a test tube. the products obtained are glucose and galactose. which of these correctly explains the function of the enzyme in this reaction?
a) the enzyme molecules collide with the substrate and break it into simpler products.
b) the enzyme has active sites where the substrate binds with the enzyme to break down the sugar.
c) the substrate binds at the non-active sites of the enzyme, where it is broken down into simpler compounds.
d) the substrate breaks the bonds of the enzyme, resulting in the formation of simpler products.

The construction of phylogenetic trees is a mapping out the proposed divisions and common ancestors of all living species. traditionally, these trees have been built using morphological data, such as appearance and embryology. recently, it has been possible to construct these trees using molecular data. phylogenetic trees based on different types of information agree with each: that there is strong evidence of a real underlying common descent. this phylogenic tree is composed based on molecular data (rrna). what statements can we infer are true about the organisms throughout the tree? because the tree is rooted, all branches share a common ancestor. all organisms have some sort of cellular structure/organization. all eukaryotes evolved from bacteria. since the organisms contain rna, they share the same dna. if the organisms contain rna, the share the same four nitrogen bases.

Which identifies the main purpose of biological taxonomy?

What organ is the first to receive nutrients that have been absorbed from the digestive tract?