Wild-Type Bacteria Can Synthesize Substance D, but Various Mutant Strains

question 79

Multiple Choice

Wild-type bacteria can synthesize substance D, but various mutant strains cannot.We know that substance D is synthesized from substance X in a pathway that involves three intermediate substances (A, B, and C) , but we do not know the order of the steps in the pathway.The table shows four different mutant strains that have been tested for their ability to grow on the various substances.A "+" means that the strain can grow on that substance; a "-" means that the strain cannot grow on that substance. Based on these data, what is the most likely order of the pathway? (A, B, C, D means that substance A is converted to substance B, which is converted to substance C, which is converted to substance D.)

• A) A, B, C, D
• B) A, C, B, D
• C) B, A, C, D
• D) C, B, A, D
• E) C, A, B, D

---

Definitions:

Organization

An entity formed by a group of people to achieve a common goal, often structured and regulated by a form of governance.

Recruitment Strategies

The methods and approaches used by employers to attract and hire candidates for positions within their organization.

Formal Mentoring

A structured program where more experienced individuals provide guidance, knowledge, and support to less experienced individuals within a professional context.

Junior Engineer

An entry-level or early-career engineer who typically works under the supervision of more experienced engineers.