With respect to microRNAs, which, if any, of the following statements, is false?

a) A microRNA normally works by binding to perfectly complementary sequences within an RNA transcript, usually an mRNA.

b) Like the great majority of mRNAs an miRNA is usually produced as a larger precursor RNA that is capped and has a 3’ poly(A) tail.

c) The precursor miRNA undergoes different types of post-transcriptional cleavage by endoribonucleases that are specific for double-stranded target sequences.

d) A nuclear endoribonuclease called dicer cleaves the miRNA precursor so that it forms a stem-loop RNA.

#Question id: 11421

#Unit 10. Ecological Principles

The strength of the island biogeography model was that it generated several falsifiable predictions

A) The number of species should increase with increasing island size.

B) The number of species should decrease with increasing distance of the island from the mainland

C) The number of species on an island might remain the same, but the composition of the species should not be change

Which of the following above statement are correct?

#Question id: 11422

#Unit 10. Ecological Principles

The values of temperature and precipitation used to define climate zones correspond to the conditions of moisture and cold stress that are particularly important determinants of plant form. Which of following is correct combination of Biome?

#Question id: 11423

#Unit 10. Ecological Principles

Our ability to distinguish different biomes under similar conditions in different parts of the world depends primarily on which of the following factors that influence the distributions of growth forms?

#Question id: 11424

#Unit 10. Ecological Principles

In robert h. Whittaker's approach to relating terrestrial biomes and climatic variables, the principal biomes fall in a triangular area that does not include climates with __________.

#Question id: 11425

#Unit 10. Ecological Principles

Walter's climate diagrams allow us to identify any months that have a water deficit. These are months in which:

#Question id: 11426

#Unit 10. Ecological Principles

Which of the following biomes is associated with a mediterranean climate?