Q: What are the three types of symbiosis? Choices: - connectionism , parasitism , commensalism - commensalism, osmosis, internalization - internalization , parasitism , commensalism - mutualism, parasitism, commensalism A:
mutualism, parasitism, commensalism

Q: How many pairs of chromosomes do human have ? Choices: - 12 pairs - 31 pairs - 19 pairs - 23 pairs A:
23 pairs

Q: Q: Hemoglobin, with four polypeptide chains or subunits, is the most frequently cited example of a protein having what kind of structure? Choices: - binary - unary - ternary - quaternary A:
A: quaternary

Question: Q: Living things that feed on others are generally known as what? Choices: - customers - isolators - producers - consumers A:
Answer: consumers

*Question*
Q: How many hydrogen atoms does a nitrogen atom of a primary amine have? Choices: - four - six - ten - two A:
**Answer**
two

Q: What kind of bonds does boron form rather than metallic lattices? Choices: - magnetic bonds - electron bonds - bilateral - multicenter A:
multicenter