#Question id: 2858
#Unit 2. Cellular Organization
When lactose enters the cell, it is converted to allolactose. It is allolactose (rather than lactose itself) that controls the Lac repressor. Paradoxically, the conversion of lactose to allolactose is catalyzed by b-galactosidase, itself encoded by one of the lac genes. How is this possible? Which statement is incorrect according lac genes expressions?
#Question id: 27679
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 15906
#Unit 5. Developmental Biology
#Question id: 7255
#Unit 5. Developmental Biology
The
hypostome acted as an “organizer” of the hydra. This notion has been confirmed
by:
A.
when transplanted, the hypostome can induce host tissue to form a second body
axis.
B.
the hypostome do not produces the head inhibition signal.
C.
the hypostome is the only “self-differentiating” region of the hydra.
D.
the hypostome produces a “head activation signal” that suppresses the formation
of new organizing centers.
Which one of the following combinations are incorrect?
#Question id: 1895
#Unit 4. Cell Communication and Cell Signaling
Septic shock associated with Gram-negative bacteria is primarily caused by: