Refer to the Following Paragraph and Figure 3

question 14

Multiple Choice

Refer to the following paragraph and Figure 3.1 to answer the following questions.

Figure 3.1
Since structure correlates so well with function,biochemists are constantly looking for new ways to probe the complex structure of proteins in order to understand what they do and how they do it.One of the most powerful techniques in existence today is X-ray crystallography.The main difficulty with this technique is getting the protein to crystallize.Once crystallized,the protein is bombarded with X-rays to create a pattern that can be analyzed mathematically to determine the three-dimensional structure of the protein.This analysis has been performed by Krzysztof Palczewski on the protein rhodopsin,which is a light-sensitive protein found in species ranging from ancient bacteria (archaea) to humans.The structure (schematically shown above,where each letter represents an amino acid) is characterized by a single polypeptide chain with several α-helical segments that loop back and forth across the cell membrane.Another notable feature is the disulfide bond (-S-S-) that can be seen at the bottom of the third transmembrane segment.[Figure adapted from K.Palczewski et al. ,Science 289 (2000) : 739.]
-What is the location of the C-terminus of the protein in Figure 3.1?

• A)extracellular
• B)cytoplasm
• C)embedded within the membrane
• D)nucleus

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Definitions:

Expensive

Involving a high cost or requiring considerable resources, often more than what is considered average or necessary.

Monozygotic Twins

Also known as identical twins, these are two individuals who originate from a single fertilized egg, sharing identical genetic material.

Zygotes

The initial cell formed when a new organism is produced by the union of male and female sexual cells, containing all the genetic information necessary to form a new individual.

Genetically Identical

Organisms or cells that have the exact same genetic material, often referred to as clones.