Which statement about a blastodisc is FALSE?
a. It can be further divided into an upper epiblast and below that, the hypoblast.
b. It results from meroblastic cleavage.
c. It is found in isolecithal eggs.
d. It is a small disc of cytoplasm at the animal pole.
e. It is characteristic of cell division in bird eggs.
c
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In Noller’s fragment reaction,
a. RNA-met* mimicked the rRNA b. puromycin was used to mimic tRNA c. the 50S subunit was used to test the peptidyl transferase reaction d. digesting proteins eliminated activity e. digesting rRNA did not eliminate activity
Which of the following situations would be considered an example of positive regulation of gene expression in a prokaryote?
A. The CAP protein activating the lac operon when lactose is absent and glucose is present. B. The CAP protein activating the lac operon when glucose is absent and lactose is present. C. The repressor protein activating the lac operon when lactose is absent and glucose is present. D. The repressor protein activating the lac operon when glucose is absent and lactose is present.
Rhizomes, tubers, corms, and stolons are examples of modified:a
leaves. b. flowers. c. roots. d. bulbs. e. stems.
The procedure in which a single stain is used to visualize microorganisms is called ________ staining.
Fill in the blank(s) with the appropriate word(s).