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Bio test 2 practice 2

# Bio test 2 practice 2 - he” Biology 131 Examination 2...

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Unformatted text preview: he”; Biology 131, Examination 2, Spring, 2003 Name (Printed) r W Signature ———————___.________________ Student Number Enter your name and student number in the space above and also on the following pages. Answer the questions in the space provided; do not write on the back. Remember that your answers will be graded by a human being, not a machine, so legible writing is essential. If your handwriting is poor, print your answers. Be sure to use appropriate units. Organize your answer so that the grader can easily follow your logic. You will lose points for poorly organized answers that include much irrelevant material. 1.00) A. (5) Suppose that the meniscus of water in a xylem tube has a radius of curvature of 10 pm. How far up the xylem tube, in meters, can water move by capillarity? Everything you need to solve this problem can be found on the first age. ’9‘“=‘°"°““ Tit-1"“ 1‘ “*"fzitfp‘m 2—14xio‘3ma e. lo. 30,014 m PCL To move We’re/L up iOM refu‘u'u'D-I "1911/ “kW-.4. o-o'ufmp‘i mmovfc l-Lil'“ l0“ awn?“ :1]. Lira —o.thc.. B. (5) Capillarity in the xylem elements cannot provide the pressure required to raise water to the top of even modestly tall plants. Explain in a few sentences how plants manage to get water to the top. Be sure to say explicitly why xylem capillarity is inadequate and what condition in what part of the plant overcomes the restriction of xylem capillarity. Illustrate your explanation by calculating the radius of curvature of water required to generate the pressure necessary to lift water to the top of a 10 m tree. You MUST organize your answer so that it can be readily graded, so think before you start to write! )J‘L/W " J ‘H " t4 +o|t¥+mm Nlm. W Mai-3 . +0 wackW-‘W w C; ' Smut-wk. m h n / lu‘o’L—Q o‘er/Wu. 'Hae‘l'irwul. {A Wi‘kdrcarmdueg P MWng ism/Elem. 101'“ mull-u to»; «he: M;V‘(.A_"'D.ll~l K .- JD 2 - -QtTj -_SL*‘i~nit>"?ﬂPot‘V‘1 : {le107m21Almo m ill/4W1 } (9—: P '- —O.iMPK Ix.) P32 W000»? N ’ CVJ ‘90‘9 ‘7L . Fey Name (Printed) E" 2. (15) Make a diagram ofone ofthe plant cells that is involved in the absorption of nutrients and water from the soil and identify the cell. Be sure to show the main anatomical feature that relates to its function. Describe the mechanism by which these cells take up K", Cl', and H30. You will need to mention primary transport, secondary transport, protons, Vm and its generation, and water potential in your answer. Make your diagram of the cell large enough to show the various transport mechanisms and add enough words to explain the processes. (Q [131— w w A? \AD-‘V‘ TL 2 V Put your diagram and identity of the cell here m d I I I 1‘,- H1 CF ‘ V alts generation T; qwxlﬂ Hecava (- IETKOmV) W LEM “a _. on?" WM": ' i W «Qua, "Ha; AT? 9‘ i’ Mi? ‘7‘ 3 tr} m TP TL Mme/n ‘3 “Vb/14‘ \ TPfo ‘Z‘F’u waif—m 1 Mec an1sm of K+ uptake: M pLthkik. M"; W L‘me «as; M 24%“ Mechanism of Cl' uptake: -003“ ‘ WW, (beam Vin Ts so we ‘ Thames—3?”; +LQWo—L‘ Mao-3i M u. ﬁlm/\$119.9“ WWQW TLE Anurnwcith‘Jt '1‘C-I‘4". m :qurd’ mc'v VJ,- H". lid: \S Seem q a__ Mechanism ofH30 uptake: N m new in K“ M qr iww +51 WW PWVQ 5.0 M \h. '4.) Kej Name (Printed) 3. (10) A. (8) The turgor pressure of'a cell is the difference in hydrostatic pressure between the inside and outside of the cell when water is at equilibrium. If the total solute concentration inside a cell is 300 m 200 mM, what is the turgor pre and in atmospheres. - r ' page. Remember tha equilibrium condition for wa er. Everythlng . - ~. manipulation, keeping track of exponents on 10. Use the AW 3 @470)“ (WWW) = O {bu/4.4.1..“ 7:. 2' Til—‘Tr‘b met Tr. .470 RT. |00mm =2.HX)031;—E~ x lOOmM M and the total solute concentration outside the cell is ssure ofthe cell? Express your answer both in MP1: notation "In —. I x 3:53:92, [OO‘Mmci-e/a: 3"” lows “W Q.'i*l0:iV:—;ﬂ‘4: Q quO‘Pa-ao QqMqugﬂww mmﬂ Mt Aft-43m Wyn-0..)th i" “e Kata/- Name (Printed) 4. (10) A. (3) What fundamental biological process leads to the production of a microspore'.’ (3359;? § How many functional microspores are produced from a single microspore mother cell (microsporocyte)? "i How many sperm cells are ﬁnally produced from a single microspore mother cell? ‘6’ . This question can be answered with one word and two numbers each written in the blanks. B. (2) How many functional megaspores are produced from a single megaspore mother cell (megasporocyte)? I How many eggs are finally produced from a single megaspore mother cell? l C. (5) What is the process by which sperm cells are delivered to the ovuole'? Start with the arrival of the desiccated sperm-bearin g apparatus (name?) on the stigma and end with the delivery of the sperm cells to synergid. Mention the role of calcium in this process. 'FINa 0 Han aWht-d-P- ﬁsh cd/urwt— ‘H \MJILW "H-uz SJ-Tamq know) M Bl—d’Lu-q 'H'UD 3+3I€ DLo-quvwle L23. Hula. ﬁfgrwh per? mire) CWHR¢W +VEJTM ﬁi—tiWML‘ M 'Hu; ﬂagging; W Cq I W 5. (5) This question refers to the role ofgibberellin in meeting the nutritional needs of the developing seedling of a cereal grain such as barley. State what cells gibberellin acts on, what effect gibberellin has on cytoplasmic Ca2+ of those cells and what process the change in C a2+ mediates. ' ‘k ‘u in GA GLUE-s ma. “liq (Lieu-ma MWL‘U 14 44 a, kWJ-TC. WW MW {14 U1 0::- OO :3 K91 Name (Printed) —~—-——-———__.______________ 6. (10) In a clearly labeled diagram, show th from a seedling hypocotyl (stem). Y and to indicate the polarity of the cel hypocotyl. She;th e basis for polar auxin transport in a cell on will need to Show what happens in the cell wall I with respect to the overall polarity of the 7. (10) The following questions refer to the response of a segjhng to light from one side. a Samua_ W M TL-QJ‘M B. What portion of the spectrum (color) is responsible for the effect? A. What is the actual growth response of the seedlino (coleoptile)? T3 [LA—5L C. What part of the coleoptile detects the light? D. What experiment did Charles and Francis Darwin do to establish the result that you cite in c. above? Tina. M "TLJ: k\ M of” '4 Wmat mt twee? Mm 9%: WM 1cm WW -\—0 at: 31-5? 2 |AI b E“- ""'ﬁ> bowling. _'P E. What hormone mediates the light response and in what direction is it initially moved in response to the light? A diagram showing where the homione ﬁrst moves and in what direction with respect to the light direction will help. Blow. {Rik-5* Flor-(,4 idw M E}: (ﬁght 6 Name (Printed) 8. (10) The following questions refer to guard cells. A. Where are guard cells found? Be as speciﬁc as possible. In +LQ claw-“Q M2 loud“ at Imam-.5) m "fl-o unohMjJ-a. B. What is the function of guard cells and how are they arranged in order to perform that function? What are the important gases whose movement guard cells control? H10 WVW" ‘1 ' ‘5‘ build-ﬂux kQ/x M Lﬂ’ﬁ I m LEM-9. éﬁrﬁtyﬁxgkmnVCHM 531 M HLO iv». M43 «dwF W lemvoL C. What is the external signal that causes stomata to close? If you can’t remember the full name, use the abbreviation that was used in class. How does this signal interact with the uardcells? . ~13. m :K m Mair—«bub. Al-vztnué’l'M‘L‘d “W W“ I (16914,..6 MW a] ﬁll... 'jH—‘VH/l _ D. When the external signal that causes stomata] closing encounters a guard cell, what is the first intracellular response? What is ﬁnal event that causes guard cell closing? lg eve/d: AK “WW {*1 i‘v’tf'quM Ca'M ‘u‘w—Q eve/«7H 'Hlﬂ moves u—«J‘ E. What is the external signal that causes stomata] opening? a ltd: max 9. (5) The following values refer to measured water potentials at various places in or neara plant (in MPa): -0.6, -0.8, ~95.0, —0.3, -0.5. Write the appropriate values next to the compartment listed below. ﬂ+ 3‘ + (1+, '1 1 ‘56: Soil, 10 mm from the root ~03 '3 J .M Soil, adjacent to the root - O. S" J‘s‘cfu ‘9‘? ’H“ a: l [42%| Root xylem w-OJD 0 WM . (NC-4"!“ I’H ""4 F“ Cell wall ofmesophyll cell in leaf '— ' g) {.0 is w ' Outside air (relative humidity = 50%) "‘ 35". O ' ﬁred-TF1 sj. HLO MWM 7 118 7 Name (Printed) I M 10. (10) Shown below on the left are the absorbence spectra for the two forms of the phytoahrome molecule. The x-axis of this graph shows the fraction of the light that is absorbed by a suspension of the molecules as a function of the wavelength of the light. Shown on the right are the two forms of the phytochrome molecule. Thioether linkage Absorbaucg Lion :00 600 3 0 Wave ic’lnaf‘ti.‘ (nm 5’0 Trans isomer Ffr 3m A. (2) Which absorbance Spectrum, 1 or 2, is for Pt-r? 3. Pr? 1 . B. (2) In the representation of Pr, circle the part ofthe molecule that absorbs light. Circle the protein part of the PR Which is for at t“! C. (6) Suppose that lettuce seeds that have been stored in the dark are exposed to a pulse oflight ofwavelength 730 nm. What form will phytochrome be in, Pr or Prr'? TE. Will the seeds germinate? N o Suppose the same seeds are then eXposed to a pulse of 670 nm light. What form will phytochrome be in? £r‘ Will the seeds germinate? \lg5 Suppose the same seeds are then exposed to sunlight. Wth form will phytochrome be in? Pr 5}: Pir‘ Willthe seeds germinate? \zleé will be Tide \‘ d “5” r " r r‘ . (—ef‘r‘ ' wee.” imbsofbt“rc\ﬂfm If Name (Printed) W 1 1 {5). Nitrogen ﬁxing bacteria that colonize the roots of legumes convert N; to NH}, which is toxic to plants. Because root hairs acidify the water around them, the NH; in the soil is converted to NHJ’: which does not easily cross cell membranes. Other bacteria in the soil then convert the NH? to nitrate, NOJ', which is not toxic to plants and is the form in which nitrogen is taken up by plants. Because NO; is also an ion, it will not cross the membrane readily and in addition, its entry is opposed by the membrane potential. What mechanism do you think the root hairs use to accumulate N03“? It may save words to use adiagram. [2.0-8- Lui-r M914 Mast. m Do not write below this line ...
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Bio test 2 practice 2 - he” Biology 131 Examination 2...

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