Q: Aldehydes, ketones, carboxylic acids, esters, and ethers all have functional groups containing what element? Choices: - silicon - methane - carbon - oxygen A:
oxygen

Q: Dna consists of how many long chains of nucleotides? Choices: - three - zero - one - two A:
two

Q: What is the term for the exchange of genetic material between non-sister chromatids of homologous chromosomes? Choices: - inheritance - asexual reproduction - meiosis - crossing-over A:
crossing-over