Questions

14 12 The method developed in Problem 14 11 was used for the routine determination of iron in 25 0 ml aliquots of groundwater Express the concentration as ppm Fe in samples that yielded the accompanying absorbance data 1 00 cm cell Calculate the relative standard deviation of the result Repeat the calculation assuming the absorbance data are means of three measurements c 0 068 e 1 512 d 1 009 f 0 546 a 0 143 b 0 675

If the standard deviation of the data values in a sample is 14 what is the variance of the data values OA 225 OB 196 O c 256 OD 144

Choose the correct answer below O 1 sec x

the approximate value in degrees of the expression using a calculator csc 6 41 CSC 6 41 Type your answer in degrees Round to two decimal pla

exact value of the expression cos 0 0 COS Type an exact answer us

What is the mode of the following data values 54 78 36 46 36 A 60 OB 46 OC 36 OD 50

sec x sec x Which of the following is a simplified form of sec x O A sec x 1 sec x OB tan x 2 sec x OC cot X CSC X

If a sample of 35 golfers is taken from a population of 72 golfers the sample mean x is the mean of how many golfers scores OA 72 B 35 OC Neither 35 nor 72 OD Both 35 and 72

0 cos 4 Select the correct choice below and fill in any answer boxes in your choice OA 0 O B 0 Type your answer in degrees 1 COS 4 does not exist

e exact value of the expression arccos 2 2 arccos 2 Type an exact answer using

X 165 Y 240 Z 117 Fit 0 Background 1 00000 115 0000 Grayscale

What is the mean of the following data values 53 71 89 10 62 OA 52 OB 57 O C 62 D 67

ve the triangle using the Law of Sines Assume b 10 and c 10 and ZC 64 Round the length to two decimal ces A b

14 11 A standard solution was put through appropriate dilutions to give the concentrations of iron shown next The iron 11 1 10 phenanthroline complex was then formed in 25 0 mL aliquots of these solutions following which each was diluted to 50 0 mL The following absorbances 1 00 cm cells were recorded at 510 nm Fe II Concentration in Original Solutions ppm 4 00 10 0 16 0 24 0 32 0 A510 0 160 0 390 0 630 0 950 1 260

What is the five number summary for this data set 4 6 10 13 18 28 34 46 50 58 Assume the numbers in each answer choice are listed in this order min Q1 median Q3 max OA 4 13 23 34 58 OB 4 10 23 46 58 OC 4 10 31 46 58 O D 4 13 31 34 58

Vrite the following expression as a constant a single trigonometric function or a power of a trigonometric function tan x cos x an x cos x

y csc x pi 6

The following data values represent a sample What is the variance of the sample x 8 Use the information in the table to help you X x x A 8 3 B 12 C 5 9 D 15 12 16 9 1 11 9 5 9 3 25

If a sample of 23 swimmers is taken from a population of 74 swimmers the population mean is the mean of how many swimmers times OA Neither 23 nor 74 OB 23 C 74 OD Both 23 and 74

What is the median of the following data values 12 13 16 19 23 27 29 31 32 33 O A 27 OB 24 3 OC 25 OD 23

13 11 The equilibrium constant for the conjugate acid base pair HIn H OH 0 In is 8 00 x 105 From the additional information in the following table a calculate the absorbance at 430 nm and 600 nm for the following indicator concentrations 3 00 10 M 2 00 10 M 1 00 10 M 0 500 10 M and 0 250 10 4 M b plot absorbance as a function of indicator concentration Species HIn In Absorption Maximum nm 430 600 Molar Absorptivity 430 nm 8 04 10 0 775 X 10 600 nm 1 23 x 10 6 96 10

Correctly label the following illustration of movement of energy through Earth s biosystem Consumers biomass Earth s biosphere Energy is gained Order increases Sun s energy 4 Earth Outside Earth Energy is dissipated Order decreases B O Decomposition Photosynthesis Light Heat Heterotrophy

ATP and NADH are important energy carriers in the cell Sort the list of features below to indicate whether they are characteristic of ATP NADH or both Features 10 items Drag and drop into the appropriate area below Can transfer phosphate groups Energy Carriers Contains nicotinamide ring ATP Drag and drop here Contains adenosine Can donate hydrogen atoms NADH Drag and drop here Diffusible through the cytoplasm Activates sugars for glycolysis Both Drag and drop here Energy stored bonds betwe two terminal phosphates

Arrange the following items in the order in which they receive electrons from glycolysis and TCA oxidations and harness the energy to establish a transmembrane proton gradient Question List 5 items Drag and drop into the appropriate area Oxidoreductase Order of electron acceptors 1 NAD 2 Oxygen 3 4 5

h In biological cells the actual AG of a given reaction may differ significantly from the predicted AG Consider a reaction in which reactants A and B are reversibly converted to products C and D When the value of AGis zero at thermodynamic equilibrium the reaction proceeds equally well in forward and reverse But what if the concentrations of products and reactants are not equal To determine the effect of relative concentrations of reactants and products on actual AG we use AG AG 2 303 RTlog C D A B where Ris the gas constant R 8 315 J K mol and Tis the absolute temperature in kelvins 298 K which is equal to 25 C V 1st attempt See Hint If a reaction has a AG close to zero but the actual ratio of products in the cell is very large i e 104 what would the corresponding effect be on actual AG and reaction direction compared to standard conditions AG Choose one or more OA There would be no change in AG relative to AG OB There would be no change in reaction direction OC The reactants would increase relative to AG OD The AGwould be more positive than AG OE The products would increase relative to A G than A

In addition to intrinsic properties such as changes in enthalpy AH and entropy AS the direction of a given reaction is dependent on the microenvironment in which the reaction takes place Therefore to facilitate comparisons scientists often use the term AG to refer to AG as determined under standard conditions Which of the following is are included in standard conditions Select all that apply Choose one or more O A concentration of reactants OB temperature C pressure O D pH O E humidity OF concentration of products

O Auxin such as Indoleacetic Acid IAA Gibberellin Ethylene O Cytokinin Abscisic Acid Brassinosteroids Question 2 1 pts Identify the class of hormone that promotes the growth of lateral buds and prevents the senescence of leaves

Abscisic acid Question 4 auxins closure Question 5 5 proteins and Identify the class of hormone that promotes cell elongation and inhibits lateral growth of buds 1 pts 1 pts

If a sample of 132 customers is taken from a population of 2340 customers the sample variance s is the variance of how many of the customers ages OA 132 B Both 132 and 2340 C Neither 132 nor 2340 D 2340

Which of the following findings support the hypothesis that Geobacter pili act as electrically conductive nanowires Choose one or more A Geobacter produces a current in fuel cells when provided with acetate B Conductivity of isolated pili is not affected by temperature and pH C Cells produce more pili when no oxidant is available D Cells unable to produce a type IV secretion system can still generate current E Cells genetically modified to produce more pili generate more current

What is the third quartile of the following data set A 29 OB 26 OC 24 OD 34 15 18 20 21 23 24 26 29 34 37 40

X 151 0 0 Y 215 Z 140 Fit C Background 0 1 00000 115 0000 Grayscale

and prevents the senescence of leaves Cytokinins Question 3 1 pts Identify the class of hormone that is growth inhibiting it promotes seed

lateral growth of buds gibberellins Question 5 Identify the phenolic compound implicated as a signal in defense responses to plant pathogens 1 pts

There are 6 strong acids you need to know List their names and formulas below 1 2 3 1 2 2 Names 4 5 6 acid acid acid Formulas 4 5

You and your friend enter a drawing with 3 different prizes A total of 11 people entered the drawing and prizes are awarded randomly There are 990 ways to award the prizes What is the probability that you win first prize and your friend wins second prize 9 O A 990 OB 1 O C IT OD D 990 11 990

Place Phoenix Italy Mexico Tokyo Lima Toronto Los Angeles What is P A OA 5 O B 19 1 3 O c 9 A place from this table is chosen at random Let event A The place is a city C D Is a city Is in North Am 2

Mitosis of an Animal Cell Enchanted Learning com

A and B are independent events P A 0 60 and P B 0 30 What is P A and B OA 0 90 OB 0 OC 0 018 OD 0 18

HW Complete problems 1 6 below f 1 Find the surface area of the sphere below 2 ft 4 ft When you are finished check the solutions in the back of the 3 Find the surface area of the sphere below 12 8 km 5 Find the surface area of the sphere below Give your answer in terms of 2 Find the surface area of the sphere below 3 1 m 4 Find the surface area of the sphere below 23 4 mi 6 Find the surface area of the sphere below Give your answer in terms of 6 m tional Complete problems 2 3 7 9 10 12 13 15 from your textbook on separate lined paper for extra actice When you are finished check the odd problems for solutiona

Your Turn 2 A basketball is a sphere 29 5 inches in circumference A baseball is a sphere of circumference 9 0 inches How much material is needed to make a basketball Use 3 14 for fr Round to the nearest tenth 1 How much material is needed to make a basketball Hint C 2mr solve for r 2 How much material is needed to make a baseball Hint C 2mr solve for r

3 Find the volume of the square pyramid below Lesson 18 2 1 2 point 9 7 ft 10 ft or 7 ft 4 Find the volume of the cone below Lesson 18 3 1 2 point 10 ft A 8 ft 9 ft 5 Find the volume of the composite figure below Leave your answer in t notation for this problem Lesson 18 3 2 points 3 16 ft Find the volume of the sphere below Lesson 18 4 1 point 10 ft Find the volume of a hemisphere that has a diameter of 26 inches Lesson 18 4 1 point

Let f x x ax 2a x a such that f x has a point of inflection located at x 2 What is the value of A 3

Determine if the area bounded by y 0 1 and x y x ln x 2 infinite If the area is finite find the area Select the correct answer below O Infinite 1 O Z O 1 In 2 1 1 In 8 2 3 In 8 In 8 2 8 is finite or

There are 11 paintings at an art show Four of them are chosen randomly to display in the gallery window The order in which they are chosen does not matter How many ways are there to choose the paintings A 44 B 121 C 330 OD 7920

Fill in the following table by writing the formulas for the perimeter and circumference of the given shapes and finding each shape s actual perimeter or circumference 7cm One sticlan 4cm Shape Polygons 3cm 4cm 11cm Circle 12 in 3cm 3cm 9 7cm Formula 2 AB AH 2 EF FG 4 CD 201 2 7 4 267 3 4 4 2 4 Testfemur sin 722 20 16 8 500m 2 TT 2TTX12 Trova 75 39 inch istorana Actual

A pet store sells mice reptiles and birds Let event A A customer buys a mouse Let event B A customer buys a bird What does P A or B 0 25 mean in terms of this problem A The probability that a customer buys either a mouse or a bird is 25 B The probability that a customer buys both a mouse and a bird is 25 C Buying a mouse and buying a bird are mutually exclusive events D The probability that a customer buys neither a mouse nor a bird is 25

A marketing firm tracks data on grocery store visits In one study it finds that the probability that a shopper buys bread during a visit to the grocery store is 0 60 and the probability that a shopper buys cheese is 0 20 Event A A shopper buys bread Event B A shopper buys cheese A and B are independent events if A the probability of buying bread or cheese is 0 80 OB the probability of buying bread and cheese is 0 C the probability of buying bread or cheese is 0 12 OD the probability of buying bread and cheese is 0 12

Lesson 19 3 Homework HW Complete problems 1 6 below for independ 1 Find the surface area of the regular pyramid below A 7 in 15 ft 6 9 in 12 km When you are finished check the solutions in the back of the t 7 in 3 Find the surface area of the regular pyramid below 10 ft 5 Find the surface area of the cone below 26 8 km 2 Find the surface area of the regular pyramid below 11 mm 8 mm 8 mm 4 Find the surface area of the cone below 13 4 km 6 km 6 Find the surface area of the cone below 8 in 9 8 in Optional Complete problems 5 6 8 9 11 12 from your textbook on separate lined paper for extra pract When you are finished check the odd proble

Find the value of O A 5040 OB 42 O C 49 O D 823 543