BIS2A 1-12

C6H12O6 + O2 -> CO2 +H2O Using this equation, which of the following are the reactants?

C6H12O6, O2

What property of carbon makes it essential for organic life?

Carbon is unique and found in all living things because it can form up to four covalent bonds between atoms or molecules. These can be nonpolar or polar covalent bonds, and they allow for the formation of long chains of carbon molecules that combine to form proteins and DNA.

You go for a long walk on a hot day. Give an example of a way in which HOMEOSTASIS keeps your body healthy.

During your walk, you may begin to perspire, which cools your body and helps your body to maintain a constant internal temperature. You might also become thirsty and pause long enough for a cool drink, which will help to restore the water lost during perspiration.

What makes ionic bonds different from covalent bonds?

Ionic bonds are created between ions. The electrons are not shared between the atoms, but rather are associated more with one ion than the other. Ionic bonds are strong bonds, but are weaker than covalent bonds, meaning it takes less energy to break an ionic bond compared with a covalent one.

Select two items that biologists agree are necessary in order to consider an organism "alive." For each, give an example of a non-living object that otherwise fits the definition of "alive,"

Layers of sedimentary rock have order but are not alive. Technology is capable of regulation but is not, of itself, alive.

Using a periodic table, electronegativity increases as...

as you move from the bottom to the top, from left to right

The smallest unit of biological structure that meets the functional requirements of "living" is the ________

cell

Which type of bond represents a weak chemical bond?

hydrogen bond ***responsible for zipping together the DNA double helix.

A suggested and testable explanation for an event is called a ________.

hypothesis

The type of logical thinking that uses related observations to arrive at a general conclusion is called ________.

inductive reasoning EX. A person notices that her houseplants that are regularly exposed to music seem to grow more quickly than those in rooms with no music. As a result, she determines that plants grow better when exposed to music.

The first forms of life on Earth were ________.

microorganisms

4 elements common to all living organisms

oxygen (O), carbon (C), hydrogen (H), and nitrogen (N)

Potassium has an atomic number of 19. What is its electron configuration?

shells 1, 2 and 3 are full and shell 4 has one electron *shell#1= 2 e-, #2&3= 8 e-

Which of the following is not a functional group that can bond with carbon?

sodium

Why are ionic bonds important in biology?

1. play an important role in determining the shapes (tertiary and quartenary structures) of proteins 2. involved in the process of enzymic catalysis 3. important in determining the shapes of chromosomes. 4. play a role in muscle contraction and cell shape 5. important in establishing polarized membranes for neuron function and muscle contraction.

Each carbon molecule can bond with as many as________ other atom(s) or molecule(s).

4

Explain how biology can be studied from a microscopic approach to a global approach

Researchers can approach biology from the smallest to the largest, and everything in between. For instance, an ecologist may study a population of individuals, the population's community, the community's ecosystem, and the ecosystem's part in the biosphere. When studying an individual organism, a biologist could examine the cell and its organelles, the tissues that the cells make up, the organs and their respective organ systems, and the sum total—the organism itself.

Compare and contrast saturated and unsaturated triglycerides.

Saturated triglycerides contain no double bonds between carbon atoms; they are usually solid at room temperature. Unsaturated triglycerides contain at least one double bond between carbon atoms and are usually liquid at room temperature.

Which of the following statements is false?

To be enantiomers, a molecule must have at least three different atoms or groups connected to a central carbon.