Question 1

During post-transcription processing of mRNA in eukaryotes

Accepted Answer

A)  the primary transcript is 'capped' by the addition of a modified guanosine triphosphate residue to the 5' end. 
B)  the primary transcript is 'capped' by the addition of a modified guanosine triphosphate residue to the 3' end. 
C)  the promoter sequence is removed from the 5' end of the mRNA and a modified guanosine tri phosphate is added to the 3' end. 
D)  the 5' end of the transcript is cleaved, and a poly A 'tail' is added to the new 5' end. 
E)  the primary transcript is 'capped' by the addition of a modified guanosine triphosphate residue to the 3' end and the promoter sequence is removed from the 5' end of the mRNA and a modified guanosine tri phosphate is added to the 3' end. 
A)  the primary transcript is 'capped' by the addition of a modified guanosine triphosphate residue to the 5' end. 
B)  the primary transcript is 'capped' by the addition of a modified guanosine triphosphate residue to the 3' end. 
C)  the promoter sequence is removed from the 5' end of the mRNA and a modified guanosine tri phosphate is added to the 3' end. 
D)  the 5' end of the transcript is cleaved, and a poly A 'tail' is added to the new 5' end. 
E)  the primary transcript is 'capped' by the addition of a modified guanosine triphosphate residue to the 3' end and the promoter sequence is removed from the 5' end of the mRNA and a modified guanosine tri phosphate is added to the 3' end.

Question 2

You are working with a strain of the common laboratory organism Pichia pastoris, a unicellular yeast. You note that this particular strain will not grow on media when it lacks valine. However, when you provide the yeast with threonine-ammonia lyase, the first enzyme in the valine biosynthesis pathway, it grows on media lacking valine. This suggests that

Accepted Answer

A)  valine is not an essential amino acid for Pichia pastoris. 
B)  there is a mutation in the gene encoding threonine-ammonia lyase in the yeast. 
C)  there is a mutation in the last step of the valine biosynthesis pathways. 
D)  there is a mutation in a middle step of the valine biosynthesis pathways. 
E)  there is a mutation in the valine biosynthesis pathway but it is not possible to say where. 
A)  valine is not an essential amino acid for Pichia pastoris. 
B)  there is a mutation in the gene encoding threonine-ammonia lyase in the yeast. 
C)  there is a mutation in the last step of the valine biosynthesis pathways. 
D)  there is a mutation in a middle step of the valine biosynthesis pathways. 
E)  there is a mutation in the valine biosynthesis pathway but it is not possible to say where.

Question 3

Proteins found in the nucleus of a eukaryotic cell

Accepted Answer

A)  were assembled there. 
B)  diffused through the nuclear pores from the cytosol. 
C)  are the same as the proteins found in the cytosol. 
D)  are synthesised in the nucleus. 
E)  are actively transported into the nucleus. 
A)  were assembled there. 
B)  diffused through the nuclear pores from the cytosol. 
C)  are the same as the proteins found in the cytosol. 
D)  are synthesised in the nucleus. 
E)  are actively transported into the nucleus.

Exam 11: The Genetic Code

During post-transcription processing of mRNA in eukaryotes

Proteins found in the nucleus of a eukaryotic cell

Nature of Molecules

Biomolecules

The Chemistry of Life

Functioning Cells

Movement Across Membranes

Harvesting Energy

Cells, Tissues and Signals

Cell Division

Inheritance

Genes, Chromosomes and Dna

Gene Expression

Genomes, Mutation and Cancer

Viruses

Genetic Engineering and Biotechnology

Reproduction, Growth and Development of Flowering Plants

Structure of Plants

Plant Nutrition, Transport and Adaptation to Stress

Plant Hormones and Growth Responses

Animal Reproduction

Animal Development

Homeostasis: Water, Solutes and Excretion

Gas Exchange in Animals

Circulation

Metabolism, Temperature Regulation and Environmental Stress

Animal and Human Nutrition

Innate Defences and the Immune System

Hormonal Control in Animals

Nervous Systems

Animal Movement

Animal Behaviour

Evolving Life

Evolving Earth

Mechanisms of Evolution

Bacteria

The Protists

Plants

Fungi

Simple Animals: Sponges to Flatworms

Annelids, Molluscs, Nematodes and Arthropods

Echinoderms and Chordates

Australian Biota

Population Ecology

Living in Communities

Ecosystems

Human Impacts

Filters