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BS Final Part 2B
BS Final Part 2B 2010
| Question | Answer |
|---|---|
| What does binary fission look like? | |
| Describe asexual reproduction. | one parent, no union of gametes, offspring genetically identical to parent |
| What are the products of a normal mitotic cell division? | 2 diploid body cells |
| What type of cell contains homologous pairs of chromosomes? | diploid |
| Draw the stages of mitosis in correct order. | |
| A cell in the stem of a corn plant has 20 chromosomes. How many will each daughter cell have? | 20 |
| How does an animal cell end mitosis? | pinches in half |
| How does a plant cell end mitosis? | forms a cell plate |
| What are these organelles? | centrioiles |
| What are A and B? | A is chromatid, B is centromere. |
| What is uncontrolled cell division called? | cancer |
| What are the daughter cells of mitosis like? | identical to the parent cells |
| What did the different tools in the beaks of finches lab represent? | feeding adaptations in finches |
| Explain the relationship of pulse rate to activity level. | More activity, faster pulse rate. |
| If your heart rate increases, what else will increase? | pulse rate |
| The type of food and the type of habitat a finch lives in is described as its... | niche |
| If frog eggs are taken out of a pond and put in saltwater, what will happen | Water will leave the eggs. |
| What type of solution was this cell exposed to? | salt |
| What will it look like once it was rinsed with distilled water for a few minutes? | The cytoplasm and cell membrane move back out to the cell wall. |
| What organ makes insulin? | pancreas` |
| When insulin decreases blood sugar level, the pancreas shuts off the insulin. What is this called? | a feedback mechanism |
| Name a system other than circulatory which would be affected by exercise, and tell how. | respiratory system - breathing rate would increase. |
| What system does pulse rate have to do with? | circulatory system |
| Name 2 internal environmental factors that influence the rate of enzyme action. | pH and temp |
| Explain why changing the shape of an enzyme affects its ability to function. | If it changes shape, it won't be able to fit with its substrate. |
| Identify specialized structures in a cell membrane that are involved in communication. | receptors |
| Why might chemicals released from one plant species not cause a response in a different plant species. | The second species might not have the properly shaped receptors. |
| State one change in the composition of the blood as it flows through the digestive system. | It gains more nutrients. |
| Identify 2 body activities that would change in response to an increase in muscle activity, and tell how each would change. | Heart rate - increaseRespiration rate - increase |
| What is a vaccine? | dead or weakened pathogen |
| What does a vaccine do in the body? | stimulates production of antibodies against the pathogen |
| Why do hormones attach to target cells and not other cells? | Other cells don't have the proper shape receptor. |
| What type of repro results in genetically identical offspring? | asexual |
| Why? | only one parent involved. No sex. |
| How do asexual and sexual repro differ? | Sexual involves union of gametes, asexual does not. |
| Endocrine and nervous systems maintain... | homeostasis |
| Parasites, fungi, bacteria and viruses disrupt | homeostasis |
| Why can some molecules pass through a cell membrane but others cannot? | Small molecules can, large cannot. |
| What happens to a cell in salt water? Draw it. | Cytoplasm loses water and shrinks. |
| How does diffusion end? | when the molecules are balanced in concentration. |
| Why do desert snakes stay underground during the day? | So they maintain homeostasis by not overheating. |
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