TLS Online TPP Program

#Question id: 292


Which of the following types of non-covalent bonds or interactions is responsible for forming the α helix and β sheet secondary structural motifs of a protein:

#XL - Q Biochemistry
  1. Ionic bonds between polar charged amino acid R groups

  2. Hydrogen bonds between electronegative atoms of polar uncharged amino acid R groups

  3. Hydrogen bonds between electronegative atoms of the peptide bond

  4. Hydrophobic Interactions between atoms of the peptide bond

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TLS Online TPP Program

#Question id: 11153

#XL - S Microbiology

A researcher wants to determine the genetic relatedness of several breeds of dog (Canis familiaris). The researcher should compare homologous sequences of __________ that are known to be __________.

TLS Online TPP Program

#Question id: 11154

#XL - S Microbiology

Concerning growth in genome size over evolutionary time, which of these does not belong with the others?

TLS Online TPP Program

#Question id: 11155

#XL - S Microbiology

Nucleic acid sequences that undergo few changes over the course of evolutionary time are said to be conserved. Conserved sequences of nucleic acids

TLS Online TPP Program

#Question id: 11156

#XL - S Microbiology

Species that are not closely related and that do not share many anatomical similarities can still be placed together on the same phylogenetic tree by comparing their

TLS Online TPP Program

#Question id: 11159

#XL - S Microbiology

Which kind of DNA should provide the best molecular clock for gauging the evolutionary relatedness of several species whose common ancestor became extinct billions of years ago?

TLS Online TPP Program

#Question id: 11161

#XL - S Microbiology

The lakes of northern Minnesota are home to many similar species of damselflies of the genus Enallagma that have apparently undergone speciation from ancestral stock since the last glacial retreat about 10,000 years ago. Sequencing which of the following would probably be most useful in sorting out evolutionary relationships among these closely related species?