Free Practice Quiz Question List

6 Protein Bioinformatics Online Quiz Questions

Use this free practice quiz with 20 questions to review 6 Protein Bioinformatics, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

True or false: A structure in the Protein Data Bank (PDB) is an experimentally determined structure, while an AlphaFold DB structure is a computational prediction.

A
True
B
False

Choose one

1 point

Two proteins differ substantially in length but may share one conserved region. Which alignment approach is best suited to finding that matching region?

A
Global alignment
B
Local alignment
C
Domain architecture
D
Multiple sequence annotation

Fill in the blank

1 point

In a BLASTP search, the E-value estimates how many matches with a similar score could arise in a database of that size.

Choose one

1 point

A protein has a statistically strong alignment to a known enzyme and contains the same conserved catalytic domain. Which conclusion is best supported by these findings?

A
The proteins have the same number of amino acids, so they must perform the same function.
B
The proteins have a statistically strong alignment and share a conserved catalytic domain, supporting a related role.
C
The top database hit alone establishes that the proteins have identical functions.
D
The proteins have different lengths, so they cannot share an evolutionary relationship.

Written response

1 point

What archive provides experimentally determined three-dimensional structures of biological macromolecules?

Fill in the blank

1 point

In an AlphaFold model, pLDDT estimates residue by residue.

Choose all

1 point

Select all statements that correctly describe how to interpret protein feature annotations in UniProtKB.

A
Some UniProtKB features are experimentally supported or manually curated.
B
Every UniProtKB feature is experimentally established.
C
Some UniProtKB features are computationally predicted.
D
Checking evidence and annotation status helps determine how firmly a feature is established.

True or false

1 point

True or false: High pLDDT for residues in separate domains automatically establishes that AlphaFold has predicted their relative arrangement with high confidence.

A
True
B
False

Choose one

1 point

Two proteins share one domain but have different combinations and orders of domains. What feature can help distinguish their functions?

A
It is the set of amino acids that forms a single short conserved pattern.
B
It is a score that estimates how many database matches arise by chance.
C
It is the order and combination of domains in a protein.
D
It is the confidence estimate for each residue in an AlphaFold model.

Choose all

1 point

You are beginning a similarity search to infer a protein's possible function. Select all checks that help assess the reliability of the sequence match or the identity of the query.

A
Check alignment coverage, identity, conserved regions, and statistical significance.
B
Confirm the organism and inspect whether the sequence entry is reviewed and which isoform it represents.
C
Assume the first database hit has the correct function without further checks.
D
Check for missing residues or ambiguous symbols in the query sequence.

Written response

1 point

A protein contains a short conserved sequence pattern that may indicate a binding or catalytic site. What is this type of pattern called?

Choose one

1 point

Two BLASTP results have comparable alignment coverage, but one has a smaller E-value. Which interpretation is most appropriate?

A
The smaller E-value proves that the proteins have identical functions.
B
The smaller E-value generally provides stronger evidence of sequence similarity, but it must be interpreted with other factors.
C
The larger E-value is stronger evidence because it indicates more possible matches.
D
E-values can be compared only when the sequences have identical lengths.

Open ended

1 point

You have an uncharacterized protein sequence and want to develop a well-supported, testable hypothesis about its function. Describe a workflow that combines sequence searches, annotations or domains, and structure resources. Explain how you would assess the evidence and qualify your conclusion.

True or false

1 point

True or false: A structure from the AlphaFold Protein Structure Database should be treated as a computational model rather than an experimental observation.

A
True
B
False

Choose one

1 point

A sequence analysis identifies a long region rich in hydrophobic residues. Which feature is this most consistent with?

A
A short pattern associated with a catalytic site
B
A hydrophobic segment that may anchor the protein in a membrane
C
A region that necessarily lacks any stable structure
D
A signal peptide that always directs the protein to the nucleus

Choose one

1 point

Two proteins have different lengths but share one conserved region. Which alignment approach is most suitable for identifying that region?

A
Global alignment, because it compares all residues and is best when only one short region is shared
B
Global alignment, because it ignores sequence length differences
C
Local alignment, because it finds the most similar matching region
D
Local alignment, because it proves the sequences have identical functions

Choose one

1 point

You have a protein sequence and want to scan it with predictive signatures to identify possible domains and other important sites. Which resource or tool is designed for this task?

A
InterProScan applies predictive signatures to submitted sequences to help identify protein features and classifications.
B
The PDB predicts domain boundaries from sequence alone.
C
UniProtKB experimentally verifies every annotated sequence feature.
D
BLASTP determines the three-dimensional structure of a query protein.

Written response

1 point

What term describes the order and combination of domains in a protein?

Choose one

1 point

When interpreting an AlphaFold model, which statement correctly distinguishes pLDDT from predicted aligned error (PAE)?

A
PAE estimates local confidence residue by residue; pLDDT assesses the placement of separate regions.
B
pLDDT estimates local confidence residue by residue; PAE helps assess uncertainty in the relative placement of regions.
C
Both measures establish whether a predicted protein interaction occurs in cells.
D
pLDDT and PAE are experimental measures from structures deposited in the PDB.

Written response

1 point

What abbreviation or full term names the AlphaFold measure that helps assess uncertainty in the relative placement of regions?