The four polypeptides that are joined together to make hemoglobin represent which level of protein organization?

List two modern organisms that have pentameral symmetry

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this