EBK WHAT IS LIFE? A GUIDE TO BIOLOGY
4th Edition
ISBN: 9781319159153
Author: PHELAN
Publisher: VST
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Chapter 2, Problem 1SA
Summary Introduction
To review:
Why the weight of electrons is ignored when we consider atomic mass.
Introduction:
Atoms are made up of three particles – protons, neutrons and electrons.
Expert Solution & Answer
Explanation of Solution
Atoms are made of the positively charged protons, neutral neutrons and negatively charged electrons. The protons and neutrons have similar weight and sit at the core of the atom (the nucleus). However, the weight of an electron is less than one-twentieth of 1% of the weight of a proton. The weight of the electrons is insignificant in comparison with that of the protons and neutrons. This is why the weight of the electrons is ignored.
Conclusion
Electrons weigh less than one-twentieth of 1% of the weight of the protons. The weight of the electrons is insignificant in comparison with that of the protons and neutrons. This is why the weight of the electrons is ignored.
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Students have asked these similar questions
19. On the diagram below
a. Label the three pictures as: DNA; polypeptide; or RNA.
b. Label the arrows as: translation or transcription/RNA processing.
c. Add the following details to the diagram.
Promoter region
TATA box
Transcription start site
Transcription terminator
Intron (A,B,C,D)
Exons (1,2,3,4,5)
Splice sites
5' cap
5' UTR (untranslated region)
3' poly A tail
3' UTR (untranslated region)
Translational start (AUG)
Translational stop (UGA, UAG, or UAA)
N and C ends of polypeptide
0000
Match the letter labels in the figure below to the terms. Some letter
labels are not used.
MNNNNNNIN
M
C
B
A
M
D
F
E
H
K
G
8
The diagram below illustrates a quorum sensing pathway from Staphylococcus aureus. Please answer the following questions.
1. Autoinduction is part of the quorum sensing system. Which promoter (P2 or P3) is critical for autoinduction?
2)This staphylococcus aureus grows on human wounds, causing severe infections. You would like to start a clinical trial to treat these wound infections. Please describe:
a) What molecule do you recommend for the trial. Why?
b) Your trial requires that Staphylococcus aureus be isolated from the wound and submitted to genome sequencing before admittance. Why? What are you testing for?
3) If a mutation arises where the Promoter P3 is constitutively active, how would that influence sensitivity to AIP? Please explain your rationale.
4) This pathway is sensitive to bacterial cell density. Describe two separate mutation that would render the pathway active independent of cell density. Briefly explain your rationale.
Mutation 1
Mutation 2
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