5 Written questions
5 Matching questions
- What is a hydrocarbon? Polar or non-polar?
- Draw functional group structure and give molecular formula for: Methyl.
- Describe surface tension and give an example relating to living organisms.
- What is heat of vaporization? How does it relate to evaporative cooling? What affect does it have on living organisms?
- Draw functional group structure and give molecular formula for: Sulfhydryl.
- a Hydrogen bonds in water hold each other together stronger than they'd bond to the air, for example. Ex: Jesus Christ lizard can walk on water because of it's surface tension; a dragonfly has non-polar exoskeleton so water beads on it
- b Methyl (−CH₃) (sex hormones, DNA methylation (when it gets tagged onto your DNA); C single bonded to 3 H's
−C − H
Ex: 5-methyl cytidine
- c Heat required to convert 1g of liquid into a gaseous state (high); Evaporative cooling is the warmest molecules of a liquid leave as a gas; allows us to sweat, or release heat so we don't die
- d Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
- e Sulfhydryl (−SH or HS−) (protein cross-linking, stabilizes structure)
Ex: Covalent bonding w/ other sulfhydryls (disulfide bridge)
5 Multiple choice questions
- Carboxyl (-COOH) acidic properties, components of many biologically important molecules; C double bonded to O and single to OH
Ex: Formic acid or acetic acid
- Ex: pH = 12, What is the molar concentration of H⁺? OH⁻? H⁺ is 1 x 10⁻¹², OH⁻ is 1 x 10⁻².
- A log scale. Each change is 10 times. So when we go up or down, we add a zero to the end.
- Fix C from atmospheric CO₂ (ex: Plants w/ photosynthesis)
- Hydrogen bonds keep the molecules spread out, so they don't pack together, making them less dense.
The floating ice insulates the body of water underneath it; if ice sank, then all the bodies of water would freeze solid, making life unlivable.
5 True/False questions
What are emergent properties of water? → Special abilities water takes on when combined with itself (only works with large amounts of molecules, not just a single molecule)
What is a buffer? → Buffers are molecules that resist change in pH; they either release H⁺ to lower the pH or take up H⁺ to raise the pH
Describe the terms: solvent, solute, and solution. → WATER!
Why is carbon the basic building element of life? → WATER!
What is specific heat? → Resistance to change in temperature