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Unformatted text preview: BME 303 Homework 1 Due on Sept 8, 2009
Copyright © Orly Alter 2009
Last Name: Lm First Name: pm i “E Lab Session: 143110 Computing Platforms l. 50%: Answer q. 1.3 on p. 17 in the textbook (see
attached). 2. Read the article “Computing with DNA,” by L. M.
Adleman (Scientiﬁc American, 1998); a reprint is available at the course website —
htt ://www.bme.utexas.edu/research/orl /teachin /BME303/Adleman.v df 3. 50%: Based on this article, what difficulty or
difficulties with electronic computers encourages the
research into DNA computing? /.3 5‘ /'OO. P15497 1. An analog machine measures physical quantities whereas a digital machine can 5 [r manipulate a ﬁxed ﬁnite set of digits or letters. 0 One issue with analog computers is how information is encoded and stored. For
example, compare a CD with a vinyl record. A CD is digitally encoded with binary code and can easily be read by a laser. A vinyl record is an analog of the IV: 1’ s 6
information. While digital computers can use bits as orage, analog computers ..
must have a physical analog of the information. (”WW1 0 Another problem with analog computers is the inability to increase their accuracy. i/ H
Applying the watch metaphor, analog watches use angular measurements to tell ”1W4
time while digital watches use digits for accurate readings/ﬁne individual may -.
read a time different to another from an analog clock but both individuals would ’4
see the exact same numbers from a digital clock. In addition, digital clocks can pm ,1 [0.
increase precision by measuring time in millisﬁonds but an analog watch would f
require an additional hand to measure time. Machm , 0 Moreover, analog computers are built for speciﬁc computations but digital
computers can compute multiple applications. Analog computers are functionally
limited to a certain task while 'gital computers could do the same task and
furthermore play chess. 3. The article “Computing with DNA” by Leonard M. Aldeman highlights the advantage \L'KO of potential DNA computing over electronic computing. Electronic computing, while
highly advantageous over analog, dwindles in compariso to DNA computing. According
to Aldeman, one gram of DNA can store as much dang/£21 information as one trillion
CDs. Evidently, the memory storage potential of DN computing dom' 'tes the current
electronic methods urthermore, the article points out the speed ofﬂular computers.
In thex ex priment, 10"14 NA ﬂight numbers were simultaneous] concatenated 1n one
second. e ﬁefﬁciencyéﬁlolecular computers once agaln shows other advantage over
electronic computing ne last advantage 1s the energy efﬁcienifﬁf molecular computers.
While electronic computers constantly overheat which, slows own processing,
molecular computers can perform 2x10"19 ligatio operations per one joule. Overall,
electronic computers lack in memory storage, speed, and efﬁciency which promotes
further research into DNA computing. Extra-Cred1t /
1. H]. Muller uilt the X-ray machine that currently stays in the Molecular Biology Building. His X-ray machine showed t t X-rays can cause mutation ‘ hich later
awarded him with a Nobel Prize. fw 2. The ﬁrst photograph was taken m 18 6 by the French inventor Joseph Nicep‘l‘e
Niepce. The photograph of farm buildings and the sky took 8 hours 0 posure time and
it is not clear exactly how Niepce was able to take the photograph or what chemicals he
used. Theorists currently believe Niepce coated the pewter plate with bitumen to develop the photograph. / ﬁlm +570 , / ...
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