4- Which of these statements concerning H-bonds is FALSE?
a. Their formation involves an attraction between an –NH group and a -C=O group in the secondary structure.
b. They are the primary bonds that hold amino acids together in the primary sequence.
c. They can be found in the secondary, tertiary and quaternary structures.
d. H-bond is a form of electrostatic attraction.

Which description provides the best objective summary of the article in the passage?

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !

Which contributions did galileo make to the model of the solar system? check all that apply. a mathematical model for the orbits of the planets scientifically accurate data on planetary orbits data that showed that planets reflected sunlight similar to earth's moon up the idea that stars are other suns that do not move u observations of the moons of jupiter rotating around the gas giant