document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=581670>Question 581670</A>: <I><SPAN STYLE=\"word-break: break-all;\"> DNA (deoxyribonucleic acid) is the basis of most genes. DNA is made of nucleotides. Each nucleotide can contain any one of these four nitrogenous bases is a linear sequence: A (adenine), G (guanine), C (cytosine), T (thymine). If an experimenter wishes to create a gene with a sequence of 9 bases, where bases can be repeated and order matters, how many different sequences are possible? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #371769 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=371769\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> There are 4 possibilities for the first position\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "There are 4 possibilities for the second position\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "...\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "etc\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Now multiply all these out \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So there are 4*4*4*4*4*4*4*4*4 = 4^9 = 262144 different sequences </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );