Which definition is the best for “semipermeable membrane”?

Some heterozygous alleles create variations in expression so that there is not a clear dominant or recessive allele. question 1 options: true false

Ectocarpene is a volatile, sperm cell-attracting material released by the eggs of the seaweed ectocarpus siliculosus. its constitution is all the double bonds are cis, and the absolute configuration of the chirality center is s. draw a stereochemically accurate representation of ectocarpene.

Works together in the synthesis, modification, packaging, and transport of lipids and proteins