Attachment of a bacteriophage to its host requires ________.
A. specific receptor molecules on the host cell
B. specific surface proteins on the bacteriophage and specific receptor molecules on the host cell
C. specific surface proteins on the bacteriophage
D. nucleic acid protein interactions
Answer: B
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Mammalian steroid hormones are signaling molecules that function in which of the following types of cell signaling?
A. juxtacrine B. paracrine C. autocrine D. endocrine E. All of these choices are correct.
You are investigating the life history of a previously unknown species of spider, when you discover an unusual fact; it seems that these spiders carry their fertilized eggs on their abdomen until they mature, at which point their offspring hatch, and devour their parent. Which term best describes this species’ reproductive strategy?
a. many offspring b. few offspring c. semelparity d. iteroparity
Woody plants have which two compounds in their cell walls?
A) chlorophyll and cellulose B) chitin and lignin C) cellulose and lignin D) chitin and cellulose
What is the first step during transcription initiation in prokaryotes?
A. RNA polymerase binds to the promoter B. the DNA double helix is unwound C. transcription factors bind to the TATA box sequence D. RNA polymerase synthesizes a short primer E. the transcription bubble is formed