Question

question 13 of 25

which statement best explains the significance of the work done by hershey and chase?

a. it provided evidence that some sort of factor is inherited from parents by offspring.
b. it supported the concepts of dominant and recessive traits.
c. it provided evidence that traits are affected by the environment.
d. it supported the idea that dna carries heritable information.

Explanation:

<pre_analysis>
{
"quality": "clear",
"question_count": 1,
"skills_matched": [
"direct_cot",
"multiple_choice_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [],
"new_concepts": [
"Hershey-Chase Experiment"
],
"current_concepts": [
"History of DNA Discovery",
"Hershey-Chase Experiment"
]
}
</pre_analysis>

<reasoning>

Identify the core scientific contribution of Hershey and Chase

The Hershey-Chase experiment (1952) used bacteriophages (viruses that infect bacteria) labeled with radioactive isotopes ($^{35}\text{S}$ for proteins and $^{32}\text{P}$ for DNA) to determine whether genetic material was composed of protein or DNA.

Evaluate the experimental results

When the phages infected bacteria, only the radioactive phosphorus ($^{32}\text{P}$) entered the bacterial cells, while the radioactive sulfur ($^{35}\text{S}$) remained outside. This demonstrated that DNA, not protein, is the hereditary material injected into hosts to direct the synthesis of new viral particles.

Match with the correct option

• Option A refers generally to Mendelian inheritance.
• Option B refers to Mendel's laws of dominance.
• Option C refers to environmental influence on phenotypes.
• Option D correctly identifies that DNA carries heritable information, which was the definitive conclusion of their work.

</reasoning>

<answer>
<mcq-option>(A) It provided evidence that some sort of factor is inherited from parents by offspring.</mcq-option>
<mcq-option>(B) It supported the concepts of dominant and recessive traits.</mcq-option>
<mcq-option>(C) It provided evidence that traits are affected by the environment.</mcq-option>
<mcq-correct>(D) It supported the idea that DNA carries heritable information.</mcq-correct>
</answer>

<post_analysis>
{
"subject": "Natural Science",
"question_type": "Multiple Choice",
"knowledge_point": [
"Natural Science",
"Biology",
"History of DNA Discovery"
]
}
</post_analysis>

Answer:

<pre_analysis>
{
"quality": "clear",
"question_count": 1,
"skills_matched": [
"direct_cot",
"multiple_choice_formatter",
"explain_then_answer",
"quick"
],
"needs_drawing": false,
"concepts_used": [],
"new_concepts": [
"Hershey-Chase Experiment"
],
"current_concepts": [
"History of DNA Discovery",
"Hershey-Chase Experiment"
]
}
</pre_analysis>

<reasoning>

Identify the core scientific contribution of Hershey and Chase

The Hershey-Chase experiment (1952) used bacteriophages (viruses that infect bacteria) labeled with radioactive isotopes ($^{35}\text{S}$ for proteins and $^{32}\text{P}$ for DNA) to determine whether genetic material was composed of protein or DNA.

Evaluate the experimental results

When the phages infected bacteria, only the radioactive phosphorus ($^{32}\text{P}$) entered the bacterial cells, while the radioactive sulfur ($^{35}\text{S}$) remained outside. This demonstrated that DNA, not protein, is the hereditary material injected into hosts to direct the synthesis of new viral particles.

Match with the correct option

• Option A refers generally to Mendelian inheritance.
• Option B refers to Mendel's laws of dominance.
• Option C refers to environmental influence on phenotypes.
• Option D correctly identifies that DNA carries heritable information, which was the definitive conclusion of their work.

</reasoning>

<answer>
<mcq-option>(A) It provided evidence that some sort of factor is inherited from parents by offspring.</mcq-option>
<mcq-option>(B) It supported the concepts of dominant and recessive traits.</mcq-option>
<mcq-option>(C) It provided evidence that traits are affected by the environment.</mcq-option>
<mcq-correct>(D) It supported the idea that DNA carries heritable information.</mcq-correct>
</answer>

<post_analysis>
{
"subject": "Natural Science",
"question_type": "Multiple Choice",
"knowledge_point": [
"Natural Science",
"Biology",
"History of DNA Discovery"
]
}
</post_analysis>