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: 19104

#Unit 6. System Physiology – Plant

The structural components of the T3SS are encoded by the clustered gene known as

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#Question id: 19105

#Unit 4. Cell Communication and Cell Signaling

The type III secretion system (T3SS), to deliver bacterial effector proteins into the plant cell have been identified to be secretion of enzymes which causes dead of the plant, these enzymes are;

a) Phosphatases

b) Proteases 

c)  Lyases

d) Isomerase

e) Ligase

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#Question id: 19105

#Unit 6. System Physiology – Plant

The type III secretion system (T3SS), to deliver bacterial effector proteins into the plant cell have been identified to be secretion of enzymes which causes dead of the plant, these enzymes are;

a) Phosphatases

b) Proteases 

c)  Lyases

d) Isomerase

e) Ligase

TLS Online TPP Program

#Question id: 19106

#Unit 8. Inheritance Biology

Assume that mating is random. First, consider an autosomal recessive disease that is usually lethal in childhood, and that has an incidence among newborns of 1/3000. What mutation rate would be required to maintain this frequency in the population? 

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#Question id: 19107

#Unit 8. Inheritance Biology

Assume that mating is random. First, consider an autosomal recessive disease that is usually lethal in childhood, and that has an incidence among newborns of 1/3000.  Perhaps the explanation for the incidence of the disease is heterozygote advantage. How large would this heterozygote advantage have to be (assuming the mutation rate is negligible)? 

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#Question id: 19108

#Unit 8. Inheritance Biology

Assume that mating is random. Colorblindness is an X-linked recessive trait that is found in about 5 percent of males. What fraction of females are heterozygous carriers of the colorblindness allele?