Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 10, Problem 1TY
Which of the following best represents the central dogma of gene expression?
- During transcription, DNA codes for polypeptides.
- During transcription, DNA codes for mRNA, which codes for polypeptides during translation.
- During translation, DNA codes for mRNA, which codes for polypeptides during transcription.
- None of the above are correct.
Expert Solution & Answer
Summary Introduction
Introduction:
The central dogma is a theory of molecular biology. It describes the process of gene expression in the living organism, which suggests that gene expression takes place in two steps, transcription and translation.
Answer to Problem 1TY
Option (b).
Explanation of Solution
Explanation for correct answer:
Option (b) During transcription, the DNA codes for mRNA and the mRNA codes for polypeptide in translation. According to the central dogma of molecular biology, the flow of genetic information is from DNA(RNA(Polypeptide. The DNA codes for the formation of mRNA in the process called transcription. The mRNA codes for polypeptide in the process is known as translation.
Explanation for the incorrect answer:
Option (a) During translation, DNA codes for the polypeptide. The translation is a process, in which mRNA codes for the polypeptide. Hence, it is an incorrect answer.
Option (c) During translation, DNA codes for mRNA and the mRNA codes for polypeptide during translation. According to central dogma, transcription is the process, in which DNA codes mRNA and translation is the process, in which mRNA codes for the polypeptide. Hence, it is not the correct answer.
Option (d) none of the above are correct. The correct answer is option (b), hence, it is an incorrect option.
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A sample of blood was taken from the above individual and prepared for haemoglobin analysis. However, when water was added the cells did not lyse and looked normal in size and shape. The technician suspected that they had may have made an error in the protocol – what is the most likely explanation?
The cell membranes are more resistant than normal.
An isotonic solution had been added instead of water.
A solution of 0.1 M NaCl had been added instead of water.
Not enough water had been added to the red blood cell pellet.
The man had sickle-cell anaemia.
With reference to their absorption spectra of the oxy haemoglobin intact line) and deoxyhemoglobin (broken line) shown in Figure 2 below, how would you best explain the reason why there are differences in the major peaks of the spectra? Figure 2. SPECTRA OF OXYGENATED AND DEOXYGENATED HAEMOGLOBIN OBTAINED WITH THE RECORDING SPECTROPHOTOMETER 1.4 Abs < 0.8 06 0.4 400 420 440 460 480 500 520 540 560 580 600 nm 1. The difference in the spectra is due to a pH change in the deoxy-haemoglobin due to uptake of CO2- 2. There is more oxygen-carrying plasma in the oxy-haemoglobin sample. 3. The change in Mr due to oxygen binding causes the oxy haemoglobin to have a higher absorbance peak. 4. Oxy-haemoglobin is contaminated by carbaminohemoglobin, and therefore has a higher absorbance peak 5. Oxy-haemoglobin absorbs more light of blue wavelengths and less of red wavelengths than deoxy-haemoglobin
Chapter 10 Solutions
Principles of Biology
Ch. 10.1 - What is the direction of flow of genetic...Ch. 10.1 - Prob. 1TYKCh. 10.1 - Prob. 2TYKCh. 10.1 - Prob. 3TYKCh. 10.2 - How would removing a terminator from a gene affect...Ch. 10.2 - Prob. 1BCCh. 10.2 - Prob. 1TYKCh. 10.2 - Prob. 2TYKCh. 10.3 - Do the ends of protein-encoding genes have a poly...Ch. 10.3 - The splicing of pre-mRNA in eukaryotes involves...
Ch. 10.3 - Prob. 2TYKCh. 10.4 - Prob. 1CCCh. 10.4 - Prob. 2CCCh. 10.4 - Prob. 1TYKCh. 10.4 - Prob. 2TYKCh. 10.5 - Prob. 1CCCh. 10.5 - Prob. 1BCCh. 10.5 - Based on the gene sequences shown here, pick two...Ch. 10.5 - Prob. 1TYKCh. 10.5 - Prob. 2TYKCh. 10.5 - Prob. 3TYKCh. 10.6 - Prob. 1CCCh. 10.6 - Prob. 1TYKCh. 10.6 - Prob. 2TYKCh. 10 - Which of the following best represents the central...Ch. 10 - Prob. 2TYCh. 10 - Prob. 3TYCh. 10 - Prob. 4TYCh. 10 - Prob. 5TYCh. 10 - Prob. 6TYCh. 10 - The legion of a tRNA that is complementary to a...Ch. 10 - Prob. 8TYCh. 10 - Prob. 9TYCh. 10 - Prob. 10TYCh. 10 - Lets suppose a gene mutation changed the sixth...Ch. 10 - What is the function of an aminoacyl-tRNA...Ch. 10 - A principle of biology is that the genetic...Ch. 10 - Prob. 1CBQCh. 10 - Prob. 2CBQ
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