A Researcher Has Arrived at a Method to Prevent Gene

question 29

Multiple Choice

A researcher has arrived at a method to prevent gene expression from Drosophila embryonic genes. The following questions assume that he is using this method.
-The researcher in question measures the amount of new polypeptide production in embryos from 2-8 hours following fertilization and the results show a steady and significant rise in polypeptide concentration over that time. The researcher concludes that

• A) his measurement skills must be faulty.
• B) the results are due to building new cell membranes to compartmentalize dividing nuclei.
• C) the resulting new polypeptides are due to translation of maternal mRNAs.
• D) the new polypeptides were inactive and not measurable until fertilization.
• E) polypeptides were attached to egg membranes until this time.

Rank compounds based on their reactivity towards specific electrophiles.

Predict the outcome of multi-step synthetic sequences involving electrophilic aromatic substitution.

Understand the influence of different activating and deactivating groups on the rate of reaction.

Draw and recognize the structure of intermediates and products in electrophilic aromatic substitution reactions.

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Definitions:

Negligent Loading

The improper or careless loading of cargo onto a mode of transportation, leading to damage or accidents.

Trailer

A trailer is a large transportable container on wheels, designed to be hauled by a truck or tractor, used for transporting goods or as a mobile living accommodation.

Bailee

A person or entity that has been entrusted with temporary possession, but not ownership, of personal property by another, known as the bailor.

Commercial Aircraft

Airplanes designated for carrying passengers or goods, operated by airlines or cargo carriers, as opposed to military or private aircraft.