Why did hershey and chase radioactively label viral dna with 32p and viral protein with 35s? (figure 13.5)

a.
so they could track where the bacterial components ended up

b.
so they could determine whether protein or rna was the genetic material

c.
because dna contains phosphorus and proteins contain sulfur

d.
to show that only viral protein entered a cell during infection

List charasteristics of athenosphere

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.

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.