What is the difference between a first messenger and a second messenger? Give an example of each. What will be an ideal response?
The first messenger binds the initial receptor. Second messengers relay signals inside the cell
and thereby amplify the signal from the first messenger. An example of a first messenger is
prostaglandin with its second messenger being cAMP.
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Lipids are the only class of macromolecules that contain:
A. amino acids. B. nucleotides. C. fatty acids. D. phosphate groups. E. monosaccharides.
The three major components of a cell are the nucleus, cytoplasm, and __________
a. plasma membrane b. phospholipids c. epithelium d. receptor proteins
Which of the following occurs for the production of a pollen grain from a microspore mother cell?
a. mitosis only b. mitosis, then meiosis c. mitosis, then meiosis, then mitosis d. meiosis only e. meiosis, then mitosis
The cross GE/ge × ge/ge produces the following progeny: GE/ge 404, ge/ge 396, gE/ge 97, Ge/ge 103. From these data, one can conclude that the G and E loci assort independently
Indicate whether the statement is true or false