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American Computer Science League
Flyer Solutions
1. Boolean Algebra
)( BA? CBBA ?( ) = BA CBBA ?( ) =
000 ???? CBBABAA
2. Computer Number Systems
18 = 1, 1002 = 4, 118 = 9, 1016 = 16 so the sequence is
1, 4, 9, 16 ? n2 . The 10th term is 102 = 100 = 1448
3. LISP
(EXP (DIV (MULT (ADD 2 (SUB 4 2 ) ) 3 ) 2 ) 4 ) =
(EXP (DIV (MULT (ADD 2 2 ) 3 ) 2 ) 4 ) =
(EXP (DIV (MULT 4 3 ) 2 ) 4 ) =
(EXP (DIV 12 2 ) 4 ) =
(EXP 6 4 ) = 1296
4. Prefix/Infix/Postfix
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Solubility Rules
1. All common salts of the Group 1 elements and ammonium ion are soluble.
2. All common acetates and nitrates are soluble.
3. All binary compounds of Group 17 elements (other than F) with metals are soluble except those
of silver, mercury(I), and lead.
4. All sulfates are soluble except those of barium, strontium, lead, calcium, silver and mercury(I).
5. Except for those in Rule 1, carbonates, oxides, sulfides, and phosphates are insoluble.
6. Oxides and peroxides are always written in molecular form.
DNA Replication: A Closer Look
* The copying of DNA is remarkable in its speed and accuracy
* More than a dozen enzymes and other proteins participate in DNA replication
The Molecular Basis of Inheritance
Life?s Operating Instructions
* In 1953, James Watson and Francis Crick introduced an elegant double-helical model for the structure of deoxyribonucleic acid, or DNA
* Hereditary information is encoded in DNA and reproduced in all cells of the body
* This DNA program directs the development of biochemical, anatomical, physiological, and
(to some extent) behavioral traits
* DNA is copied during DNA replication, and cells can repair their DNA
Alterations of chromosome number or structure cause some genetic disorders
* Large-scale chromosomal alterations in humans and other mammals often lead to spontaneous abortions (miscarriages) or cause a variety of developmental disorders
* Plants tolerate such genetic changes better than animals do
Abnormal Chromosome Number
* In nondisjunction, pairs of homologous chromosomes do not separate normally during meiosis
* As a result, one gamete receives 2 of the same type of chromosome, and another gamete receives no copy
The Chromosomal Basis of Inheritance
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