must complete a certain cell cycle before it can carry out another. The most interesting realization is that M phase and G2 fusion caused G2 to enter mitosis. When unfertilised Xenopus oocytes were injected into interphase oocytes there were similar results obtained. This meant that in the cytoplasm of dividing cells a factor controlled entry to mitosis and the activity was called the M-phase controlling factor. 4. The G1/S control point is determined by three cyclindependent kinases (Cdk2‚ Cdk4
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Unit 1 Diversity 1. List the 6 kingdoms for classifying living things. 2. List the levels of organisation from kingdom to species. 3. What is binomial nomenclature? 4. Who is Carl Linnaeus? 5. What is a dichotomous key? 6. Draw and label the lifecycle of a DNA virus. 7. Distinguish between DNA and RNA viruses. 8. Compare eukaryotic cells and prokaryotic cells. 9. Define coccus‚ bacillus‚ streptococcus‚ and spirillum? 10. What are 3 examples of helpful bacteria? 11. What do bacteria need
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contents of the nucleus of a cell. It has 4 main functions: to package DNA into a smaller volume to fit in the cell‚ to strengthen the DNA to allow for mitosis‚ to prevent DNA damage‚ and finally‚ to control gene expression and DNA replication. The structure of chromatin consists of a series of DNA wrapped around histones to form nucleosomes. But during mitosis the chromatin is compacted to form chromosomes. Each human has 23 pairs of chromosomes consisting of a sugar/phosphate backbone and nitrogenous base
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Midterm Study Guide Answers 1. A hypothesis is an explanation of observations. “If the floor is wet‚ I will slip.” 2. A controlled experiment is when only one variable is changed. 3. If the plant you are experimenting with has a disease that is an unavoidable experimental error. 4. An enzyme speeds up reactions and lowers the energy it takes to produce something‚ a lock and key. 5. Autotrophs make their own food by producing sugars from sunlight and various chemicals. 6
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The zygote divides multiple times by mitosis in order to produce an embryo. The embryo then differentiates to become a plumule‚ radicle‚ and/ or one or two cotyledons‚ which is attached to the wall of the embryo sac by a suspensor. Endosperm tissue is produced by the primary endosperm nucleus dividing multiple times by mitosis. This endosperm stores food for later use by the seed in some cases. It may gradually disappear as the
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What is Biological Psychology? It is the study of the physiological‚ evolutionary‚ and developmental mechanisms of behavior and experience. It is synonymous with the terms biopsychology‚ physiological‚ and behavioral neuroscience. Much of biological psychology is devoted to studying brain functioning. Physiology is the study of body processes- the dynamic of tissue and organ system of the body. It is the study of the physiological basis of human and animal behavior. Areas of Biological
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Biology 101 FINAL EXAMINATION Spring‚ 2013 Name: Gabriel Euzebio Date: May 10‚ 2013 GENERAL INSTRUCTIONS: This final exam is worth 100 points. There are three sections. The Multiple Choice section has 50 questions worth 1 point each‚ for a total of 50 points. The Fill-In The Blanks section has 10 questions worth 1 point each‚ for a total of 10 points. For the Short Answer section‚ you must choose to answer 8 of the 12 questions‚ and each question is worth 5 points‚ for a total
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STANDARD GRADE BIOLOGY CREDIT LEVEL REVISION QUESTIONS INVESTIGATING CELLS 1. In an investigation‚ three 25 g samples of sultanas were put into separate beakers of distilled water‚ as shown below: After 24 hours‚ the sultanas were removed from the water‚ blotted on filter paper and reweighed. The results are shown in the table: |Sample |Mass after 24 hrs (g) |Percentage change in mass | |1
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In which animal cells would Golgi apparatus be most abundant? A ciliated epithelial cells B goblet cells C red blood cells D smooth muscle cells 5 Which is a feature of all prokaryotic cells? A absence of cell surface membrane B division by mitosis C presence of mitochondria D presence of ribosomes 6 The diagram shows a cell surface membrane. The lipid bilayer has an approximate width of 8nm. How many times has the diagram been magnified? A 2.5 × 102 B 2.5 × 104 C 2.5 × 106
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learned in class new cells form from old cells through the process of meiosis and mitosis. In meiosis‚ chromosome pairs synapse‚ cross over‚ align‚ and separate twice. The crossing over results in the mixing of genetic information between the chromosome pairs. When they separate‚ they divide and form four cells with varied genetic material‚ resulting in offspring that are varied forms of their parents. In mitosis‚ chromosomes divide and form two cells with no change in genetic material‚ resulting
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