Figure 1. A dopaminergic synapse between two neurons A and B. 1. Explain how the different parts of the synapse shown in Figure 1
allow the transmission of an action potential between Neuron A and
Neuron B. [3 marks]
2. Cocaine is a drug that interferes with normal functioning of the
dopamine response
a. Explain why the presence of cocaine may increase feelings of
pleasure in the brain. [3 marks]
3. Figure 2 below is a graph showing the membrane potential in Neuron
B during and after the release of dopamine from Neuron A. The
graph shows changes in voltage in millivolts (mV) against time in
milliseconds (ms).

Approximately 90% of all cases of polycystic kidney disease are inherited in an autosomal dominant fashion. the disease is typically related to mutations to genes (pkd1 and pkd2). pkd genes can be found on chromosome 16. the disease occurs in approximately 1: 800 to 1: 1000 people. here is a hypothetical example. the dominant allele d will cause the development of pkd. the recessive allele is known as d. what genotypes would correspond to suffering from pkd? dd, dd what genotypes would correspond to being normal (not suffering from pkd)? dd consider that 1: 1,000 people have pkd in your population of 325million. consider that pkd is inherited in an autosomal dominant fashion. show you math for all of the following questions: what is the genotypic frequency for dd? what is the genotypic frequency for dd? what is the genotypic frequency for dd? what is p? what is q? how many people in your population would have pkd?

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?

To store strawberries in sugar syrup, lucy placed them in a jar and covered them with sugar but did not add any water. do you think syrup will be formed? justify. a. no. since water is not added, there cannot be any syrup formation. b. no. the higher concentration of sugar on the outside will cause the water from the sugar to diffuse in the strawberry cells causing them to swell without formation of any syrup. c. yes. the higher concentration of sugar on the outside will cause the water from the strawberry to diffuse out resulting in syrup formation. d. yes. the sugar will melt over time and form the syrup.