Build: Follow the steps given in the Gizmo to
construct a molecule of DNA. (Note: For simplicity,
this DNA molecule is shown in two dimensions,
without the twist.)
Stop when the hint reads: “The DNA molecule is
complete.” In the spaces at right, list the sequence
of nitrogenous bases on the left-hand side of the
DNA molecule and the right-hand side.
2. Take a picture: Click the camera ( ) to take a
snapshot of your DNA molecule. Right-click the
image and select Copy Image. Paste the image
into a blank document, and label this image
“Original DNA molecule.”

Left side Right side

b. Each chlorine has three non-bonded pairs and one bonded pair of electrons.

Explanation:

Chlorine has three valance electrons. Each Cl atom forms a single covalent bond with the central P atom by sharing a pair of electrons. After forming a single covalent bond each Cl atom is left with six electrons that do not participate in any bond formation or there are three pairs of lone electrons.

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: