After allowing phages grown with bacteria in a medium that contained 32P and 35S, Hershey and Chase used a centrifuge to separate the phage ghosts from the infected cell. They then examined the infected cells and found that they contained _____, which demonstrated that _____ is the phage's genetic material.
Fill in the blank(s) with the appropriate word(s).
Ans: labeled DNA ... DNA
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Which class of proteins are embedded in the phospholipid bilayer?
a. cytoskeletal proteins b. integral proteins c. transcription factor proteins d. peripheral proteins e. protein hormones
Genes live at specific locations along a chromosome called a _______.
a. habitat b. locus c. niche d. genetic zone
In lakes, the open-water surface layer is called the ____
a. benthic zone b. abyssal zone c. limnetic zone d. littoral zone e. profundal zone
Testosterone is made in the testes, where it stimulates sperm development. Additionally, testosterone is carried in the blood throughout the body, stimulating the growth of facial hair and muscles. Therefore, testosterone is
A) an endocrine hormone. B) both a local and an endocrine hormone. C) a local hormone. D) both a neurotransmitter and an endocrine hormone. E) a neurotransmitter.