Ques: Q: What two things are a phospholipid molecules composed of? Read this paragraph and choose the correct option from the provided answers: Figure 5.3 This phospholipid molecule is composed of a hydrophilic head and two hydrophobic tails. The hydrophilic head group consists of a phosphate-containing group attached to a glycerol molecule. The hydrophobic tails, each containing either a saturated or an unsaturated fatty acid, are long hydrocarbon chains. Choices: - hydrophillic head , and adhesion tails - hydrophillic head , and substrate tails - hemophillic head, and substrate tails - hydrophillic head , and hydrophobic tails A:
Ans: hydrophillic head , and hydrophobic tails

Ques: Q: What do we call the amount of time it will take for half of the radioactive material to decay? Read this paragraph and choose the correct option from the provided answers: The measure of how quickly a nucleus decays is given by the half-life of the nucleus. One half-life is the amount of time it will take for half of the radioactive material to decay. Choices: - one partial-life - one full-life - one quarter-life - one half-life A:
Ans: one half-life

Ques: Q: What crystals consist of molecules at the lattice points of the crystal, held together by relatively weak intermolecular forces? Read this paragraph and choose the correct option from the provided answers: 4. Molecular crystals -- Molecular crystals typically consist of molecules at the lattice points of the crystal, held together by relatively weak intermolecular forces (see Figure below ). The intermolecular forces may be dispersion forces in the case of nonpolar crystals, or dipole-dipole forces in the case of polar crystals. Some molecular crystals, such as ice, have molecules held together by hydrogen bonds. When one of the noble gases is cooled and solidified, the lattice points are individual atoms rather than molecules. In all cases, the intermolecular forces holding the particles together are far weaker than either ionic or covalent bonds. As a result, the melting and boiling points of molecular crystals are much lower. Lacking ions or free electrons, molecular crystals are poor electrical conductors. Choices: - quartz crystals - salt crystals - healing crystals - molecular crystals A:
Ans: molecular crystals

Ques: Q: What are a group of protists whose monophyly is well supported by molecular systematics? Read this paragraph and choose the correct option from the provided answers: Choices: - euglenozoa - sporozoans - mycetozoa - alveolates A:
Ans:
alveolates