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.

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#Question id: 1383

#Unit 4. Cell Communication and Cell Signaling

Match the following correctly

 

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#Question id: 10894

#Unit 10. Ecological Principles

A group of species that interact with each other in their exploitation of a resource gradient are referred to as

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#Question id: 1935

#Unit 4. Cell Communication and Cell Signaling

Evidence for immune surveillance of tumors comes from a substantially increased incidence of certain cancers in patients with:

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#Question id: 29002

#Unit 7. System Physiology – Animal

glycogenolysis stimulation takes place  when____

I- Glucagon receptors located on the hepatic cells by inhibiting glycogen synthesis 

II- Glucagon receptor found primarily on liver cells by increasing intracellular cAMP

III- Glucagon receptors located on the liver cells by inhibiting glycogen synthesis 

IV- Glucagon receptor found primarily on hepatic cells by increasing intracellular cAMP

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#Question id: 11005

#Unit 7. System Physiology – Animal

Which of the following phases of the cardiac cycle follows immediately after the beginning of the QRS wave?