PCR efficiency is influenced by several factors, the efficiency declines due to

a) efficiency of amplification declines with an increase in the length of the target sequence.

b) Efficiency of PCR is affected by primer length; it declines if the primers used for PCR arc too long.

c) a temperature higher than the ideal annealing temperature reduces PCR efficiency.

d)  primers used for PCR have complementary regions, dimers will be formed, and PCR efficiency will decline.

#Question id: 11330

#SCPH28 | Zoology

Bio geographers have noted that the tropics have more terrestrial species than temperate regions. Which of the following is NOT a plausible explanation for this pattern?

#Question id: 11331

#SCPH06 I Botany

Based on the intermediate disturbance hypothesis, a community’s species diversity is increased by

#Question id: 11331

#SCPH28 | Zoology

Based on the intermediate disturbance hypothesis, a community’s species diversity is increased by

#Question id: 11332

#SCPH06 I Botany

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

 A) tropical communities are older.

 B) tropical regions generally have more available water and higher levels of solar radiation.

 C) higher temperatures cause more rapid speciation.

 D) diversity increases as evapotranspiration decreases.

#Question id: 11332

#SCPH28 | Zoology

The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that

 A) tropical communities are older.

 B) tropical regions generally have more available water and higher levels of solar radiation.

 C) higher temperatures cause more rapid speciation.

 D) diversity increases as evapotranspiration decreases.

#Question id: 11333

#SCPH06 I Botany

Small geographic areas with high concentrations of endemic species and a large number of endangered and threatened species are known as