Intermediary cells are specialized companion cells that are involved in phloem loading in the plant. Which of the following pathway that have included the intermediary-type companion cells?

#Question id: 1424

#Unit 4. Cell Communication and Cell Signaling

Gain-of-function mutations in which of the following genes typify colorectal carcinomas?

#Question id: 3436

#Unit 11. Evolution and Behavior

Loss of responsiveness to stimuli that convey little or no new information is called

#Question id: 7308

#Unit 5. Developmental Biology

In Arabidopsis thaliana, the transition to flowering involves multiple factors, pathways and meristem identity genes. Following statements regarding to the mechanism and function of meristem identity genes.

 A. FT mRNA is expressed in companion cells of the leaf vein in response to multiple signals, including day length, light quality, and temperature.

 B. The FT–FD complex activates AP1 in the inflorescence meristem and SOC1 in the floral meristem, which triggers LFY gene expression.

 C. LFY and AP1 trigger expression of the floral homeotic genes.

 D. FLC acts as a negative regulator of SOC1 in the meristem and as a negative regulator of FT in the leaves.

 Which of the following is incorrect?

#Question id: 296

#Unit 1. Molecules and their Interaction Relevant to Biology

In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by ________.

#Question id: 1263

#Unit 4. Cell Communication and Cell Signaling

The major classes of CAMs include

a. cadherins.    b. fibronectin.    c. Ig-superfamily CAMs.      d. P-selectins.