Unit 3 What I messed up on

A vibrant and engaging illustration of DNA strands intertwined with symbols of viruses, RNA, and genetic coding elements, conveying the themes of genetics and molecular biology.

Biology Mastery Quiz

Test your understanding of key genetic concepts with our comprehensive quiz! This quiz covers essential topics such as gene expression, genetic mutations, and the role of viruses in biology.

Get ready to challenge yourself with questions about:
- Homologous chromosomes
- The genetic code
- RNA and transcription
- Phage cycles
- Antiviral drug mechanisms

11 Questions3 MinutesCreated by LearningCell123

When homologous chromosomes cross over, what occurs?

Maternal alleles are "corrected" to be like paternal alleles, and vice versa

Two chromatids get tangled, resulting in one re-sequencing its DNA

Specific proteins break the two strands of nonsister chromatids and re-join them

Two sister chromatids exchange identical pieces of DNA

Each of the four DNA strands of a homologous pair is broken, and the pieces are mixed

The genetic code is essentially the same for all organisms. From this, one can logically assume which of the following?

All organisms have experienced convergent evolution

DNA was the first genetic material

A gene from an organism can theoretically be expressed by any other organism

The same codons in different organisms translate into the different amino acids

Different organisms have different numbers of different types of amino acids

Which of the following best describes the significance of the TATA box in eukaryotic promoters?

Its significance has not yet been determined

It sets the reading frame of the mRNA

It prevents supercoiling of the DNA near the start site

It is the recognition site for the ribosomal binding

It is the recognition site for a specific transcription factor

There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is best explained by the fact that

The rules for base pairing between the third base of a codon and tRNA are flexible

Many codons are never used, so the tRNAs that recognize them are dispensable

Competitive exclusion forces some tRNAs to be destroyed by nucleases

The DNA codes for all 61 tRNAs but some are then destroyed

Some tRNAs have anticodons that recognize four or more different codons

What is the effect of a nonsense mutation in a gene?

It has no effect on the amino acid sequence of the encoded protein

It introduces a premature stop codon into the mRNA

It prevents introns from being excised

It alters the reading frame of the mRNA

It changes an amino acid in the encoded protein

Of the following, which is the most current description of a gene?

A unit of heredity that causes formation of a phenotypic characteristic

A DNA sequence that is expressed to form a functional product: either RNA or polypeptide

A discrete unit of hereditary information that consists of a sequence of amino acids

A DNA subunit that codes for a single complete protein

A DNA-RNA sequence combination that results in an enzymatic product

Given the locally unwound double strand in Figure 14.3, in which direction does the RNA polymerase move?

5' -> 3' along the template strand

5' -> 3' along the double-stranded DNA

5' -> 3' along the complementary strand

3' -> 5' along the complementary strand

3' -> 5' along the template strand

In the transcription event of the previous DNA, where would the promoter be located?

To the right of the sense strand

At the 3' end of the newly made RNA

To the left of the sense strand

to the right of the template strand

to the left of the template strand

Which of the following statements describes the lysogenic cycle of lambda phage?

The phage DNA is incorporated by crossing over into any nonspecific site on the host cell's DNA

Most of the prophage genes are activated by the product of a particular prophage gene

After infection, the viral genes immediately turn the host cell into a lambda-producing factory, and the host cell then lyses

Certain environmental triggers can cause the phage to exit the host genome, switching from the lytic to the lysogenic

The phage DNA replicates along with the host DNA

Antiviral drugs tha have become useful are usually associated with which of the following properties?

Ability to remove all viruses from the infected host

Removal of the viral mRNAs

Prevention of the host from becoming infected

Removal of viral proteins

Interference with viral replication

RNA viruses require their own supply of certain enzymes because

Host cells lack enzymes that can replicate the viral genome

These enzymes penetrate host cell membranes

These enzymes translate viral mRNA into proteins

Host cells rapidly destroy the viruses

These enzymes cannot be made in host cells

Unit 3 What I messed up on

Biology Mastery Quiz

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