Mosses produce sperm during the _______ stage.
A. gametophyte
B. flowering
C. sporophyte
D. cone-bearing
A. gametophyte
Biology & Microbiology
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Autoimmune diseases result from a breakdown in the ability of the body to____
a. produce antibodies b. produce memory cells c. destroy major histocompatibility proteins d. distinguish self from non-self e. distinguish between harmless and pathogenic microorganisms
Biology & Microbiology
Many proteins are now thought to consist of modular units that through exon shuffling form new proteins. How is this situation analogous with what may have been the situation with the earliest life?
What will be an ideal response?
Biology & Microbiology
The petals of a flower make up the ____
a. corolla b. filament c. ovule d. calyx e. receptacle
Biology & Microbiology
What evidence supports the theory of an early "RNA world"?
What will be an ideal response?
Biology & Microbiology