Questions
which of these illustrates the secondary structure of a protein?

Which of these illustrates the secondary structure of a protein?

 

In: Biology

An Hfr strain that is met + pro + bio + his + was mated with an F- strain that was met - pro - bio - his -.

An Hfr strain that is met + pro + bio + his + was mated with an F- strain that was met - pro - bio - his -. Mating was interrupted and the percentage of cells with each phenotype was determined by replica plating the cells on minimal media plates that lacked met, pro, bio or his. The data shown in Figure 1 were obtained. (Figure 1)

Using the data in Figure 1, label each line on the results graph below.

Drag the phenotype to the appropriate line on the graph.

In: Biology

Generally speaking, which of the following mutations would most severely affect the protein coded for by a gene?

Generally speaking, which of the following mutations would most severely affect the protein coded for by a gene?

  • a base substitution at the beginning of the gene
  • a base substitution at the end of the gene
  • a frameshift deletion at the beginning of the gene
  • a frameshift deletion at the end of the gene

In: Biology

Label the four mutated DNA segments shown below according to the type of point mutation each represents.

Label the four mutated DNA segments shown below according to the type of point mutation each represents. Use the codon table above to determine how each mutation would affect the amino acid coding for each segment.

Drag the labels to their appropriate locations to identify the type of point mutation shown.

 

In: Biology

If a segment of DNA were replicated without any errors, the replicated strand would have the following sequence of nucleotides:

Base substitution mutations and frameshift mutations
If a segment of DNA were replicated without any errors, the replicated strand would have the following sequence of nucleotides:
5' - ACTACGTGA - 3'

Sort the following replicated DNA sequences by the type of point mutation each contains (frameshift, base substitution, or neither), as compared to the correct sequence shown above.

Sort the items into the appropriate name as frameshift mutation, base substitution mutation and or neither
5'-ACTCGTGA-3'
5'-ATTACGTGA-3'
5'-ACTACGTGT-3'
5'-ACTAAGTGA-3'

 

In: Biology

Drag each label into the appropriate bin depending on whether it applies to primary, secondary, tertiary, or quaternary structure

Drag each label into the appropriate bin depending on whether it applies to primary, secondary, tertiary, or quaternary structure

In: Biology

The DNA in a cell's nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell.

 

The DNA in a cell's nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell.
For example, consider these two proteins:
1. Phosphofructokinase (PFK) is an enzyme that functions in the cytoplasm during
glycolysis.
2. Insulin, a protein that regulates blood sugar levels, is secreted from specialized
pancreatic cells.

Assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations.

For each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (Note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)

Options:
Cytoplasm only, ER --> cytoplasm, ER --> Golgi --> outside cell, cytoplasm --> ER --> outside cell, Golgi --> ER --> outside cell, cytoplasm --> Golgi --> outside cell, nucleus --> cytoplasm, ER --> Golgi --> cytoplasm

Protein Targeting Pathway

PFK _______________
Insulin _______________

In: Biology

Based on the genetic code chart below, which of the following would be the result of this single base-pair substitution?

The diagram below shows an mRNA molecule that encodes a protein with 202 amino acids. The start and stop codons are highlighted, and a portion of the nucleotide sequence in the early part of the molecule is shown in detail. At position 35, a single base-pair substitution in the DNA has changed that would have been a uracil (U) in the mRNA to an adenine (A).

Based on the genetic code chart below, which of the following would be the result of this single base-pair substitution?

  • A. a silent mutation (no change in the amino acid sequence of the protein)
  • B. a frameshift mutation causing extensive change in the amino acid sequence of the protein
  • C. a missense mutation causing a single amino acid change in the protein
  • D. a frameshift mutation causing a single amino acid change in the protein
  • E. a nonsense mutation resulting in early termination of translation