Practice Questions

TLS Online TPP Program

#Question id: 11987

A cage containing male mosquitoes has a small earphone placed on top, through which the sound of a female mosquito is played. All the males immediately fly to the earphone and thrust their abdomens through the fabric of the cage. What is the best explanation for this behavior?

#Unit 10. Ecological Principles

The males learn to associate the sound with females.
Copulation is a fixed action pattern, and the female flight sound is a sign stimulus That initiates it.
The sound from the earphone irritates the male mosquitoes, causing them to attempt to sting it.
The reproductive drive is so strong that when males are deprived of females, they will attempt to mate with anything that has even the slightest female characteristic.

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TLS Online TPP Program

#Question id: 159

#Unit 1. Molecules and their Interaction Relevant to Biology

The chirality of an amino acid results from the fact that its alpha carbon:

TLS Online TPP Program

#Question id: 160

#Unit 1. Molecules and their Interaction Relevant to Biology

Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________.

TLS Online TPP Program

#Question id: 161

#Unit 1. Molecules and their Interaction Relevant to Biology

Two amino acids of the standard 20 contain sulfur atoms. They are:

TLS Online TPP Program

#Question id: 162

#Unit 1. Molecules and their Interaction Relevant to Biology

All of the amino acids that are found in proteins, except for proline, contain a(n):

TLS Online TPP Program

#Question id: 163

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements about cystine is correct?

TLS Online TPP Program

#Question id: 164

#Unit 1. Molecules and their Interaction Relevant to Biology

The uncommon amino acid selenocysteine has an R group with the structure —CH2—SeH (pKa = 5). In an aqueous solution, pH = 7.0, selenocysteine would: