I think it’s c. Hope you get it right!
Crossing over during meiosis
The plasma membrane of a cell is selectively permeable, which means it allows some materials to pass.
Answer: C) or the third option.
Given the following choices
A. position of the carbon-carbon double bonds
B. presence of enclosed carbon atom rings
C. branching of the carbon chain
D. length of the carbon chain
The answers are; B, C & D. Carbon is a versatile atom (with a valence of +4) and is able to bond with other elements and other carbon atoms in different ways. It can form linear and branching chains of varying lengths. It can form double and single bonds with elements and form rings such as the deoxyribose sugars.
<span>There are 4 electron pairs (3 bonding and 1 lone pair) so the angle is 107 degrees. The 4 electron pairs are repelled to give a tetrahedral arrangement but the molecule has a pyrimidal shape due to the lone pair. </span>