5. Dr. Wallace wants to test the effectiveness of a new steroid cream on rashes. In order to achieve a reliable result, she should: instruct patients to apply only the steroid cream being tested on affected areas
expose each patient to different environmental stresses
Ovary the amount of cream used from day to day
o use a different cream on every subject in her study

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that a) the four organisms do not have a common ancestor. b) humans are more closely related to chimps than any other apes. c) chimps are more closely related to gorillas than they are to humans. eliminate d) there is no evidence if any relationship between the four branches on the tree.

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.