Video Transcript
Fill in the blank. DNA, deoxyribonucleic acid, is the
genetic material found in our cells. DNA is made up of two strands that
twist around each other to form a blank. Long molecules of DNA coil into
structures called chromosomes. Chromosomes are found in the
nucleus of our cells.
Inside most of our cells is the
genetic material DNA, or deoxyribonucleic acid. The structure of DNA was a mystery
for a long time. Eventually, we discovered that DNA
is made up of two strands. Imagine a ladder, where each arm of
the ladder is a DNA strand. Each strand is made up of many
repeating parts called nucleotides. These join together to form the
rungs or steps of the ladder. Nucleotides on one strand can fit
together with nucleotides on the other strand. This is what keeps the two strands
stuck together. In DNA, these two strands are
twisted around each other. We call this shape a double
helix.
Therefore, in the statement “DNA is
made up of two strands that twist around each other to form a blank,” the correct
answer to fill in the blank is double helix.
