Describe the structure and function of the DNA molecule.
What will be an ideal response?
DNA is composed of a phosphate group, nitrogen-containing base, and a five-carbon (pentose) sugar. The nitrogen-containing base can have one of four bases associated with it (adenine, thymine, cytosine, and guanine). Functions of DNA include: stores information about how to copy or replicate itself and specifies the order in which amino acids are joined to make a protein.
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Match the following items with the correct phrases.
_______1. ____________________ are also known as immunogens. _______2. Molecules referred to as antigenic determinants are also known as ____________________. _______3. ____________________ are in a class of proteins called immunoglobulins. _______4. Small molecules called ____________________ are antigenic only when then are coupled with large carrier molecules such as proteins. _______5. ____________________ initiate type III hypersensitivity reactions. a. antibodies b. antigens c. epitopes d. haptens e. immune complexes
Plants living in standing water often face which of the following problems?
A. increased CO2 levels B. chilling of the roots C. oxygen deprivation D. loss of stomata E. harmful root pressure
For the bay checkerspot butterfly, a poor flyer, to recolonize small patch habitats, the new habitats must be ____
a. high quality b. low quality c. close to a source population d. far from a source population e. above a certain number of individuals
The active ingredient in Ecstacy works by
a. binding to active transporters in brain neuron membranes. b. blocking the movement of neurotransmitters across synapses c. binding to neuroreceptors on the ends of neurons d. stopping signal transmissions down the length of an axon e. inhibiting the release of neurotransmitters at the synaptic junction