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2012 dse bio practice paper for cursive writing

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Cell biology homework help cellcommunity of teachers, mentors and students just like you that can answer any question you might have on sciencepearson prentice hall and our other respected imprints provide educational materials, technologies, assessments and related services across the secondary used in an a college-level cell biology class: free ppt lectures, class notes.

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Bacteria - humans, body, used, water, process, earth, life. The biology project, an interactive online resource for learning biology developed at the university of arizona. We will call you back. Bacteria are very small organisms, usually consisting of one cell, that lack chlorophyll a green pigment found in plants that allows for the production of.

The words you need to find are listed to the right cell biology homework help of the word search. During t3, the homologous chromosomes separate. During t4, the synthesis of cell organelles takes place. The following diagram shows an animal cell with some of its organelles: Q P R Which of the labelled structures are particularly abundant in an enzyme-secreting cell? Relative rate of enzymatic reaction min—1 In an experiment to investigate the effect of temperature on the activity of a digestive enzyme X, the time taken for the digestion of a fixed amount of substrate by this enzyme was recorded.

Which of the following graphs shows the most likely results of the experiment? Relative rate of enzymatic reaction min—1 4.

Temperature oC D. Relative rate of enzymatic reaction min—1 C. Temperature oC 5. Relative rate of enzymatic reaction min—1 Temperature oC Temperature oC The table below shows the ratios of initial mass to final mass of three fresh potato cylinders which have been immersed in sucrose solutions of three different concentrations for 30 minutes: Solution P 0.

There is a net movement of water from the potato cylinders to solution Q. Solution Q has a higher sucrose concentration than solution R. NADPH is generated. Which of the following correctly lists the substances formed in the Krebs cycle? The graph below shows the rate of photosynthesis of a plant at different temperatures and carbon dioxide concentrations when light intensity increases: Rate of photosynthesis arbitrary unit 8. At 25 units of light intensity and 0.

At 25 units of light intensity, 15oC and 0. A couple has two children. The son is of blood group B and the daughter is of blood group A. Which of the following is not a possible combination of genotypes of this couple? PP-DSE-BIO 1A—5 the mutation of genes the separation of homologous chromosomes during meiosis the independent assortment of homologous chromosomes during meiosis the random fertilisation of gametes 5 Go on to the next page In guinea pigs, the genes for fur colour and hair length are located on different chromosomes.

The alleles for black fur and long hair are recessive to the alleles for brown fur and short hair respectively. Guinea pigs which are heterozygous for both fur colour and hair length are allowed to breed. Of the offspring produced, how many are expected to have black fur and short hair? Chan and Mrs. Chan are the biological parents of four children.

The DNA profiles of Mr. Chan and the four children are shown below: Mr. Which of the following combinations shows the correct classification of the organism according to the Three Domain System? Organism nitrifying bacteria amoeba yeast algae Kingdom Archaebacteria Animalia Fungi Protista Domain Bacteria Eukarya Archaea Eukarya Below are the scientific names of four species of shrimps: 1 2 3 4 Leptochela japonicus Metapenaeus japonicus Metapenaeus joyneri Metapenaeopsis dura Which two of the above species should have the closest phylogenetic relationship?

The following dichotomous key can be used to identify five species of amphibian: 1 a the skin is rough 2 1 b the skin is smooth 3 2 a the dorsal side has coloured stripes Species P 2 b the dorsal side does not have coloured stripes Species Q 3 a the toes have sticky pads 4 3 b the toes do not have sticky pads Species R 4 a the limbs are spotted Species S 4 b the limbs are not spotted Species T Use the above key to identify the three amphibians in the following photographs.

Amphibian 1 A. The body size of species X is larger than that of species Y. There is an energy loss when energy flows from species Y to species Z. PP-DSE-BIO 1A—7 1 and 2 only 1 and 3 only 2 and 3 only 1 , 2 and 3 7 Go on to the next page Three types of seaweeds, P, Q and R, were collected from the intertidal zone the zone between the high tide mark and the low tide mark of a rocky shore. The distribution of these seaweeds in the intertidal zone is related to their ability to withstand exposure to air.

The graph below shows the changes in the fresh mass of these seaweeds when they are left to dry in the laboratory: Fresh mass P Q R 0 Time Which of the following shows the most likely distribution of these seaweeds from the lower shore to the upper shore?

P competition mutualism commensalism mutualism Q commensalism competition parasitism predation Which of the following is not a limitation of the use of fossil records as evidence for evolution? Some organisms may not form fossils.

Fossils are found in different sedimentary rock layers. Fossils present in inaccessible areas are not available to us for study. Which of the following are necessary for speciation? The amino acid sequences of a certain protein in five species of organisms were analysed and compared. The following table shows the number of amino acid differences between the amino acid sequence of species P and that of each of the other four species: Species The number of amino acid differences between the amino acid sequence of species P and that of the other species Q R S T 31 16 36 1 Assuming that these five species of organisms arose from the same ancestral stock, which of the following diagrams best represents the evolutionary tree constructed using the above information?

S Which of the following descriptions about the regulation of the blood glucose level is correct? The liver secretes more glucagon when the blood glucose level is low.

More glycogen is converted to glucose when more glucagon is secreted. More glucose is taken up by cells when more glucagon is secreted. The flow chart below shows the interaction between the two endocrine glands and the hormones they secrete: Endocrine gland P secretion Hormone X 2 Endocrine gland Q 1 secretion 3 Hormone Y Which of the following combinations correctly shows the regulation of hormone Y by a negative feedback mechanism?

The diagram below shows a weight potometer used in an experiment. The leafy shoot was left in the laboratory for 3 hours. The change in the reading of the electronic balance and the change in the volume of water in the measuring cylinder were recorded.

The experiment was then repeated under the same environmental conditions with the upper surface of all the leaves of the shoot smeared with vaseline. The results are shown in the following table: Treatment leafy shoot oil layer measuring cylinder water electronic balance Change in the reading of the balance g Change in the volume of water in the measuring cylinder mL I Leaves not smeared with p vaseline II Upper surface of all leaves q smeared with vaseline Note: 1.

The photographs below show the appearances of a flower at different times of a day: am pm With reference to the appearances of the flower at the times shown, which of the following can be concluded?

The rate of water uptake of the flower is higher than its rate of transpiration at am. The rate of water uptake of the flower is lower than its rate of transpiration at pm. During t2, the intercostal muscles contract. During t3, the diaphragm is pulled flat. During t4, the rib cage is moved upwards and outwards.

Structure P contracts to deliver blood to various parts of the body except the lungs. Structure Q receives blood from the pulmonary veins. Structure R controls the opening and closing of the valve. Structure S contracts to force the blood out of the heart through the pulmonary artery. The photograph below shows the cross section of the umbilical cord of a foetus: Blood vessel Y Blood vessel X Which of the following descriptions about blood vessels X and Y are correct? There are valves along the length of blood vessel Y but not in blood vessel X.

The blood in blood vessel Y has a lower oxygen content than that in blood vessel X. The photograph below shows the cross section of a leaf: 1 3 2 4 There is a gas released by the leaf when it is placed in darkness. From which of the labelled cells is this gas released? Questions 35 and 36 refer to the following description of an experiment, which was carried out in the s by a scientist, Christiaan Eijkman, for identifying the cause of the disease beriberi: Experimental conditions chickens with beriberi and healthy chickens kept together; fed with unpolished rice healthy chickens injected with bacteria taken from chickens with beriberi; fed with unpolished rice healthy chickens; fed with polished rice healthy chickens; fed with unpolished rice all chickens remained healthy all chickens developed beriberi all chickens remained healthy Which of the following can be concluded from this experiment?

Beriberi is most likely non-infectious. Eating unpolished rice can prevent beriberi in healthy chickens. Result after 5 weeks chickens with beriberi recovered, others remained healthy 1 and 2 only 1 and 3 only 2 and 3 only 1 , 2 and 3 In light of the results of this experiment, Eijkman used prisoners for testing whether the same cause led to beriberi in humans.

Which of the following should have been included in the experimental design so that he could make a valid conclusion? The controlled variables should have included the sex, age and body mass of the prisoners. The prisoners chosen for the test should have been randomly assigned to the experimental and control groups. Do not write in the margins. Answers written in the margins will not be marked.

Put your answers in the spaces provided. For each of the infectious diseases listed in Column 1, select one of the methods listed in Column 2 that helps to protect people from contracting the disease.

Put the appropriate letter in the space provided. Dengue fever The following shows an electronmicrograph of a cell taken from a leaf: Answers written in the margins will not be marked. State the process by which ATP is synthesised in each structure. The electronmicrograph below shows two types of photoreceptors in the human eye: A a Name the part of the human eye where the photoreceptors are found.

Explain this with respect to the functioning of photoreceptors A and B. B When a slice of apple is exposed to air, it quickly turns brown.

This is because the enzyme diphenol oxidase catalyzes the oxidation of phenols in the apple to dark-coloured products. In an experiment, the effect of a chemical, PHBA, on the rate of this enzymatic reaction was investigated. The experiment was carried out at the same temperature and the same concentration of diphenol oxidase was used. Explain how this factor may affect the activity of the enzyme. Relative rate of enzymatic reaction arbitrary unit 4.

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During t1, the nuclear membrane disappears. There is a net movement of water from the potato cylinders to solution Q. A biologist is a scientist who studies biology.
2012 dse bio practice paper for cursive writing
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When wheat grains are sown on a piece of farmland which has been frequently sprayed with a pesticide X, the germination rate is poor. The alleles for black fur and long hair are recessive to the alleles for brown fur and short hair respectively. Marks will not be awarded for genetic diagrams. There is a net movement of water from the potato cylinders to solution Q. At 25 units of light intensity and 0. Trees are logged from two forests, A and B, for this research and other uses.

When told to open this book, you should check that all the questions are there. Coli, ragweed pollen answer: dust mite um , protozoan um , ragweed pollen 20 um , red blood cell 10 um , e. Bacteria are very small organisms, usually consisting of one cell, that lack chlorophyll a green pigment found in plants that allows for the production of. The pedigree of this family is shown in the following diagram: Key: A B Male with normal colour vision Colour-blind male Female with normal colour vision C D E F a Normal people have 23 pairs of chromosomes in the cell nucleus, but people with Down syndrome have an extra chromosome in the 21st pair of chromosomes. The experiment was then repeated under the same environmental conditions with the upper surface of all the leaves of the shoot smeared with vaseline. Research paper topics on agriculture.
The prisoners chosen for the test should have been randomly assigned to the experimental and control groups. The controlled variables should have included the sex, age and body mass of the prisoners. The following dichotomous key can be used to identify five species of amphibian: 1 a the skin is rough 2 1 b the skin is smooth 3 2 a the dorsal side has coloured stripes Species P 2 b the dorsal side does not have coloured stripes Species Q 3 a the toes have sticky pads 4 3 b the toes do not have sticky pads Species R 4 a the limbs are spotted Species S 4 b the limbs are not spotted Species T Use the above key to identify the three amphibians in the following photographs.

Ap biology essays cell communication. Amphibian 1 A. What tail could you ask for. The results of the test are shown below: Diameter of clear zone Answers written in the margins will not be marked.
2012 dse bio practice paper for cursive writing
Homework help cell and molecular biology. During t3, the diaphragm is pulled flat. The production of soy sauce consists of three stages: incubating boiled soy beans and wheat grains with a fungus to produce the feedstock, fermenting the feedstock in the brine added, and pasteurising the raw soy sauce for bottling. One most to this problem is cell biology cell biology homework help assignment help from ezassignmenthelp.
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Homework help cell molecular biology. Nine of the followed 15 sentences are false. The following graph shows the plasma concentrations of progesterone, luteinising hormone and follicle stimulating hormone of a woman over a period of time: Progesterone 10 8 Luteinising hormone 6 4 Follicle stimulating hormone 2 0 0 0 7 Beginning of menstruation 14 21 28 35 42 Concentration of luteinising hormone and follicle stimulating hormone in plasma ng mL—1 Concentration of progesterone in plasma ng mL—1 1. Computer - mediated cell division biology homework help knowledge communication in everyday life, children must be initiated on many pedagogical decisions of eighteen - year degree the first edition was cell division biology homework help revised after five years; the s and was driven by advances in the united states has been hotly.

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Put the appropriate letter in the space provided. Related documents. Explain the result of antibiotic B in this test. How can computers help cure cell biology homework help cancer.

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NADPH is generated. He filters 50 cm3 of the water sample through a membrane filter, on which bacteria are retained.

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Explain how human activities may have caused this trend. State a difference between this mechanism and diffusion. The bacteria were inoculated on the surface of an agar plate. Relative rate of enzymatic reaction min—1 4.

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