Following statements are regarding to gap junctions.

i. Vertebrate gap junctions are composed of connexins, a family of structurally related transmembrane proteins with molecular weights between 26,000 and 60,000.

ii. Each vertebrate hexagonal particle consists of six noncovalently associated connexin molecules. Each individual connexin molecule has two membrane-spanning α helices with a topology similar to that of claudin.

iii. The permeability of gap junctions is regulated by posttranslational modification of connexins (e.g., phosphorylation) and is sensitive to changes in environmental conditions

such as intracellular pH and Ca2+ concentration, membrane potential, and the intercellular potential between adjacent interconnected cells (“voltage gating”).

iv. The assembly of connexins, their trafficking within cells, and the formation of functional gap junctions apparently depend on N-cadherin and its associated adapter proteins as well as desmosomal proteins.

Which of the following statements are correct?

#Question id: 10751

#Unit 10. Ecological Principles

Possible interaction between populations in following manner ,which of the following best represent for negative ineteracion ?

#Question id: 10752

#Unit 10. Ecological Principles

Which of the following is an example of Batesian mimicry?

A) a butterfly that resembles a leaf

B) a nonvenomous larva of a moth that moves like a venomous snake

C) a fawn with fur coloring that camouflages it in the forest environment

D) a snapping turtle that uses its tongue to mimic a worm, thus attracting fish

#Question id: 10753

#Unit 10. Ecological Principles

Which of the following is correct combination? 

#Question id: 10754

#Unit 10. Ecological Principles

Following is different type of interaction was shown in figure. (+: Benefit , - Harm , 0= Neither benefit nor harm) What is interaction between column A & B in each schematic?

#Question id: 10755

#Unit 10. Ecological Principles

For two species A and B in competition, the carrying capacities, competition coefficients, per capita growth rate and population size are

KA = 1000          KB = 1200        α= .5    r A= .3    N1= 500         N2= 200          

According to the Lotka-Volterra model, what is growth rate of species A?

#Question id: 10756

#Unit 10. Ecological Principles

Which of following is correct about interaction?

A) Population growth of each species is limited more by intraspecific competition than by interspecific competition.

B) The species with the greater initial abundance wins out.

C) Population of each species coexist and reach at stable equilibrium point

D) Population growth of each species is limited by only intraspecific competition