
Concept explainers
The experiments with nutritional mutants in Neurospora by Beadle and Tatum provided evidence that
a. bread mold can be grown in a lab on minimal media.
b. X-rays can damage DNA.
c. cells need enzymes.
d. genes specify enzymes.

Introduction:
To identify the working nature of genes, scientists from all over the world conducted various experiments. The results revealed by them include, the functions controlled by the genes and the enzymes specified by the genes.
Answer to Problem 1U
Correct answer:
The experiments with nutritional mutants in Neurospora by Beadle and Tatum provided evidence that genes specify enzymes. Therefore, option d. is correct.
Explanation of Solution
Reason for the correct statement:
Beadle and Tatum showed that genes specify enzymes. In neurospora, each enzyme of the arginine pathway was encoded by a separate gene. The mutant species of neurospora were unable to synthesize arginine. Beadle and Tatum found that specific enzymes controlled by specific genes were absent in the mutant neurospora. They proposed the one gene-one enzyme hypothesis.
Option d. is given as "genes specify enzymes".
As, “the experiments with nutritional mutants in Neurospora by Beadle and Tatum provided evidence that genes specify enzymes”, it is the right answer.
Hence, the option d. is correct.
Reasons for the incorrect statements:
Option a. is given as “bread mold can be grown in a lab on minimal media”.
In the experiments conducted by Beadle and Tatum, bread mold was grown to determine the enzymes specific for the growth. So, it is a wrong answer.
Option b. is given as “X-rays can damage DNA”.
The experiments conducted by Beadle and Tatum to determine the limiting factors for specific enzymes and not to determine what X-rays do to the DNA. So, it is a wrong answer.
Option c. is given as “cells need enzymes”.
The experiments conducted by Beadle and Tatum were performed to determine the limiting factors, which control synthesis of enzymes responsible for specific functions. So, it is a wrong answer.
Hence, the options a., b., and c. are incorrect.
The experiments with nutritional mutants in Neurospora by Beadle and Tatum provided evidence that genes specify enzymes.
Want to see more full solutions like this?
Chapter 15 Solutions
Biology
- Which of the following is not a DNA binding protein? 1. the lac repressor protein 2. the catabolite activated protein 3. the trp repressor protein 4. the flowering locus C protein 5. the flowering locus D protein 6. GAL4 7. all of the above are DNA binding proteinsarrow_forwardWhat symbolic and cultural behaviors are evident in the archaeological record and associated with Neandertals and anatomically modern humans in Europe beginning around 35,000 yBP (during the Upper Paleolithic)?arrow_forwardDescribe three cranial and postcranial features of Neanderthals skeletons that are likely adaptation to the cold climates of Upper Pleistocene Europe and explain how they are adaptations to a cold climate.arrow_forward
- Biology Questionarrow_forward✓ Details Draw a protein that is embedded in a membrane (a transmembrane protein), label the lipid bilayer and the protein. Identify the areas of the lipid bilayer that are hydrophobic and hydrophilic. Draw a membrane with two transporters: a proton pump transporter that uses ATP to generate a proton gradient, and a second transporter that moves glucose by secondary active transport (cartoon-like is ok). It will be important to show protons moving in the correct direction, and that the transporter that is powered by secondary active transport is logically related to the proton pump.arrow_forwarddrawing chemical structure of ATP. please draw in and label whats asked. Thank you.arrow_forward
- Outline the negative feedback loop that allows us to maintain a healthy water concentration in our blood. You may use diagram if you wisharrow_forwardGive examples of fat soluble and non-fat soluble hormonesarrow_forwardJust click view full document and register so you can see the whole document. how do i access this. following from the previous question; https://www.bartleby.com/questions-and-answers/hi-hi-with-this-unit-assessment-psy4406-tp4-report-assessment-material-case-stydu-ms-alecia-moore.-o/5e09906a-5101-4297-a8f7-49449b0bb5a7. on Google this image comes up and i have signed/ payed for the service and unable to access the full document. are you able to copy and past to this response. please see the screenshot from google page. unfortunality its not allowing me attch the image can you please show me the mathmetic calculation/ workout for the reult sectionarrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage LearningPrinciples Of Radiographic Imaging: An Art And A ...Health & NutritionISBN:9781337711067Author:Richard R. Carlton, Arlene M. Adler, Vesna BalacPublisher:Cengage Learning
- Understanding Nutrition (MindTap Course List)Health & NutritionISBN:9781337392693Author:Eleanor Noss Whitney, Sharon Rady RolfesPublisher:Cengage LearningHuman Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning




