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||Homework Help||Kindergarten-University. (Page 74)

Miggi Groupbie
Miggi
Miggi

Joined: 02 June 2006
Posts: 142

Posted: 08 February 2012 at 10:23pm | IP Logged
i already did all tests but do i need to add those extra ones in my dichotomous key e.g. if proteus vilgaris is negative for catalase test and other two microoirganisms are positive, now i have proteus vulgaris separated from other to microorganisms but do i still need to show other tests for proteus vulgaris on the dichotomous key??
akhl IF-Rockerz
akhl
akhl

Joined: 30 March 2007
Posts: 5265

Posted: 09 February 2012 at 2:09am | IP Logged
If you alreadyd did the tests and separated the microorganism, then no need of showing any further tests.

Birdiee IF-Stunnerz
Birdiee
Birdiee

Joined: 02 November 2008
Posts: 28748

Posted: 09 February 2012 at 10:41am | IP Logged
Umm! I am having hardtime figuring this out. I get 16, but books says 10.5
When silver cyrystallizes , it form face centered cubic cells.The unit cell edge is 408.7 pm. calculate the density of silver.
akhl IF-Rockerz
akhl
akhl

Joined: 30 March 2007
Posts: 5265

Posted: 09 February 2012 at 3:13pm | IP Logged
@syria2014
What is mass of one unit cell?

-Indescribable- IF-Dazzler

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Posted: 14 February 2012 at 5:41pm | IP Logged
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akhl IF-Rockerz
akhl
akhl

Joined: 30 March 2007
Posts: 5265

Posted: 22 February 2012 at 2:48am | IP Logged

1.      What should be the end result when DNA fragments containing two or more genes of the same family with high homology to each other are

digested briefly with DNase I,

medium-size fragments are selected after size fractionation

PCR amplified for about 30 cycles after adding only two terminal primers from the 5' and 3' ends of the genes

a.    nothing should happen because PCR primers for the small fragments were not added to the reaction mixture

b.      full-length reshuffled DNA among the genes will be established

c.       gene fragments will cross-prime each other resulting in inhibition of the PCR reaction

d.      the fragments will randomly ligate and form concatemers

e.       DNase I will degrade all single stranded DNA and only small fragments of double stranded DNA will remain



Edited by akhl - 22 February 2012 at 2:49am
Miggi Groupbie
Miggi
Miggi

Joined: 02 June 2006
Posts: 142

Posted: 23 February 2012 at 6:40pm | IP Logged
Q An auditorium has organ pipes at the front and at the rear of the hall. Two identical pipes one at the front and one at the back, have fundamental frequencies of 274Hz, at 20 degree C.during a performance the organ pipes at the back of the hall are at 27.2 degree C while those at front are 22 degree C. what is the beat frequecy when the two pipes sound simultaneously?
 
Q If the wavelength of the Electromagnetic wave is about the size of a person, what type of radiation is it?
a) UV                                                        d) Radio wave
b) Infrared                                                 e) visible light.
c) Microwave
 
akhl IF-Rockerz
akhl
akhl

Joined: 30 March 2007
Posts: 5265

Posted: 23 February 2012 at 7:31pm | IP Logged
Originally posted by Miggi

Q An auditorium has organ pipes at the front and at the rear of the hall. Two identical pipes one at the front and one at the back, have fundamental frequencies of 274Hz, at 20 degree C.during a performance the organ pipes at the back of the hall are at 27.2 degree C while those at front are 22 degree C. what is the beat frequecy when the two pipes sound simultaneously?
 
Do you know the equation between frequency and temperature?

Q If the wavelength of the Electromagnetic wave is about the size of a person, what type of radiation is it?
a) UV                                                        d) Radio wave
b) Infrared                                                 e) visible light.
c) Microwave
 
d) Radio waves

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