Cotyledons develop as part of ______. a. carpels b. accessory fruits c. embryo sporophytes d. flowers
> Compute the numbers. 84/3
> Graph the following equations. y = -2x + 3
> Compute the numbers. (-5)-1
> Compute the numbers: (.01)-1
> Compute the numbers. (½)-1
> Compute the numbers. 6-1
> Describe the domain of the function. f (t) =1 / √t
> Compute the numbers. (1 / 125)1/3
> Compute the numbers. (.000001)1/3
> Compute the numbers. (27)1/3
> Compute the numbers. (16)1/2
> Compute the numbers. (.01)3
> Use intervals to describe the real numbers satisfying the inequalities. x < 3
> Compute the numbers. -42
> Compute the numbers. (100)4
> Compute the numbers. (.1)4
> Use the quadratic formula to find the zeros of the functions in Exercises 1–6. f (x) = 2x2 - 7x + 6
> Find a good window setting for the graph of the function. The graph should show all the zeros of the polynomial. f (x) = 2x5 - 24x4 - 24x + 2
> Describe the domain of the function. f (x) =8x / (x - 1)(x - 2)
> Find a good window setting for the graph of the function. The graph should show all the zeros of the polynomial. f (x) = 3x3 + 52x2 - 12x - 12
> Find a good window setting for the graph of the function. The graph should show all the zeros of the polynomial. f (x) = x4 - 200x3 - 100x2
> Find a good window setting for the graph of the function. The graph should show all the zeros of the polynomial. f (x) = x3 - 22x2 + 17x + 19
> In Exercises 51–54, find the points of intersection of the graphs of the functions. (Use the specified viewing window.) f (x) = 1 / x; g(x) = √(x2 – 1); [0, 4] by [-1, 3]
> Graph the following equations. y = - ½ x - 4
> In Exercises 51–54, find the points of intersection of the graphs of the functions. (Use the specified viewing window.) f (x) = 3x4 - 14x3 + 24x - 3; g(x) = 2x - 30; [-3, 5] by [-80, 30]
> In Exercises 51–54, find the points of intersection of the graphs of the functions. (Use the specified viewing window.) f (x) = -x - 2; g(x) = -4x2 + x + 1; [-2, 2] by [-5, 2]
> In Exercises 51–54, find the points of intersection of the graphs of the functions. (Use the specified viewing window.) f (x) = 2x - 1; g(x) = x2 - 2; [-4, 4] by [-6, 10]
> In Exercises 47–50, find the zeros of the function. (Use the specified viewing window.) f (x) = x / (x + 2) - x2 + 1; [-1.5, 2] by [-2, 3]
> In Exercises 47–50, find the zeros of the function. (Use the specified viewing window.) f (x) = √(x + 2) - x + 2; [-2, 7] by [-2, 4]
> In Exercises 47–50, find the zeros of the function. (Use the specified viewing window.) f (x) = x3 - 3x + 2; [-3, 3] [-10, 10]
> An office supply firm finds that the number of laptop computers sold in year x is given approximately by the function f (x) = 150 + 2x + x2, where x = 0 corresponds to 2015. (a) What does f (0) represent? (b) Find the number of laptops sold in 2020.
> Draw the following intervals on the number line. (4, 3π)
> In Exercises 47–50, find the zeros of the function. (Use the specified viewing window.) f (x) = x2 - x - 2; [-4, 5] [-4, 10]
> When a car is moving at x miles per hour and the driver decides to slam on the brakes, the car will travel x + (1/20) x2 feet. (The general formula is f (x) = ax + bx2, where the constant a depends on the driver’s reaction time and the constant b depends
> Graph the following equations. y = 3x + 1
> Suppose that the cable television company’s cost function in Example 4 changes to C(x) = 275 + 12x. Determine the new breakeven points.
> Solve the equations in Exercises 39–44. x2 - 8x + 16 / 1 + √x = 0
> Solve the equations in Exercises 39–44. x2 + 14x + 49 / x2 + 1 = 0
> Solve the equations in Exercises 39–44. 1 = 5 / x +6 / x2
> Solve the equations in Exercises 39–44. x + 14 / x + 4 = 5
> Solve the equations in Exercises 39–44. x + 2 / x – 6 = 3
> Solve the equations in Exercises 39–44. 21/x - x = 4
> Find the points of intersection of the pairs of curves in Exercises 31–38. y = 30x3 - 3 x2, y = 16x3 + 25x2
> The boiling point of tungsten is approximately 5933 Kelvin. (a) Find the boiling point of tungsten in degrees Celsius, given that the equation to convert x°C to Kelvin is k(x) = x + 273. (b) Find the boiling point of tungsten in degrees Fahrenheit. (Tu
> Find the points of intersection of the pairs of curves in Exercises 31–38. y = ½ x3 + x2 + 5, y = 3x2 - 12x + 5
> Graph the following equations. y = 3
> Draw the following intervals on the number line. [ -1, 4]
> A new plant forms from a stem that broke off of the parent plant. This is an example of ______. a. nodal cloning b. exocytosis c. asexual reproduction d. tissue culture propagation
> Exposure to ______ can trigger seed germination. a. light b. cold c. smoke d. all can be triggers
> Commands to move your right arm start in the _________. a. left frontal lobe b. right occipital lobe c. right temporal lobe d. left parietal lobe
> When you sit quietly on the couch and read, output from _______ neurons prevails. a. sympathetic b. parasympathetic
> Which neurotransmitter is important in reward-based learning and drug addiction? a. Ach b. serotonin c. dopamine d. epinephrine
> What chemical is released by axon terminals of a motor neuron at a neuromuscular junction? a. Ach b. serotonin c. dopamine d. epinephrine
> 1. Neurotransmitters are released by. a. axon terminals b. a neuron cell body c. dendrites d. glial cells 2. Which of the following are not in the brain? a. Schwann cells b. astrocytes c. microglia
> _____ relay messages from the brain and spinal cord to muscles and glands. a. Motor neurons b. Sensory neurons c. Interneurons d. Neuroglia
> Some survivors of disastrous events develop posttraumatic stress disorder (PTSD). Symptoms include nightmares about the experience and suddenly feeling as if the event is recurring. Brain-imaging studies of people with PTSD showed that their hippocampus
> Restoring a marsh that has been damaged by human activities is an example of ________. a. biological magnification b. bioaccumulation c. ecological restoration d. globalization
> Seeds are mature __________; fruits are mature _______. a. ovaries; ovules b. ovules; stamens c. ovules; ovaries d. stamens; ovaries
> The seed coat forms from the _________. a. integuments b. coleoptiles c. endosperm d. sepals
> Meiosis of cells in pollen sacs forms haploid __________. a. megaspores b. microspores c. stamens d. sporophytes
> An animal pollinator may be rewarded by ______ when it visits a flower of a coevolved plant (choose all that apply). a. pollen b. nectar c. hormones d. fruit
> 1. The arrival of pollen grains on a receptive stigma is called. a. germination b. fertilization c. pollination d. propagation 2. The ______ of a flower contains one or more ovaries in which eggs develop, fertilization occurs, and seeds mature. a. polle
> Why do eudicot trees tend to be wider at the base than at the top?
> Aboveground plant surfaces are covered with a waxy cuticle. Why do roots lack this protective coating?
> El Malpais National Monument, in west central New Mexico, has pockets of vegetation that have been surrounded by lava fields for about 3,000 years, so they have escaped wildfires, grazing animals, agricultural activity, and logging. Henri Grissino-Mayer
> In plants, fibers are a type of cell. a. parenchyma b. sclerenchyma c. collenchyma d. mesophyll
> El Malpais National Monument, in west central New Mexico, has pockets of vegetation that have been surrounded by lava fields for about 3,000 years, so they have escaped wildfires, grazing animals, agricultural activity, and logging. Henri Grissino-Mayer
> Biodiversity refers to ________. a. genetic diversity b. species diversity c. ecosystem diversity d. all of the above
> A prominent chin is typical of ______. a. Homo sapiens b. Homo habilis c. Homo erectus d. Homo floresiensis
> The position where a spinal cord enters the skull provides evidence about whether a fossil species _________. a. was nocturnal b. was carnivorous c. walked upright d. all of the above
> The 3.6-million-year-old footprints left by bipedal walkers in Tanzania were probably made by ______. a. australopiths b. Neanderthals c. modern humans d. Homo erectus
> The closest relatives of bonobos are ______. a. chimpanzees b. humans c. tarsiers d. Old World monkeys
> Match each structure with its description. cataract a. protects eyeball cochlea b. transmits vibration to bone eardrum c. functions in balance lens d. detects pheromones sclera e. interferes with vision fovea f. contains chemoreceptors taste bud g. focus
> _______ causes the pupil to widen. a. Low light b. Bright light
> Defective or missing ______ cause color blindness. a. hair cells b. rod cells c. cone cells d. neuroglia
> When you view a close object your lens gets ________. a. flatter b. rounder c. darker d. cloudier
> Visual accommodation involves adjustment to the shape or position of the _________. a. conjunctiva b. retina c. orbit d. lens
> Night vision begins with stimulation of _______. a. hair cells b. rod cells c. cone cells d. neuroglia
> Use of CFCs was banned in order to ______. a. lower sea level b. slow glacial melting c. discourage desertification d. prevent ozone destruction
> The organ of Corti contains receptors that signal in response to _______. a. heat b. sound c. light d. pheromones
> Substance P _______. a. increases pain-related signals b. is a natural painkiller c. is the active ingredient in aspirin
> Mechanoreceptors in the _______ send signals to the brain about the body’s position relative to gravity. a. eye b. ear c. tongue d. nose
> Cells lining the epididymis secrete a glycoprotein (beta-defensin) that coats sperm and facilitates their passage through cervical mucus. There are two common alleles for human beta-defensin: a wild-type allele (wt) and an allele with a deletion (del). T
> The cervix is the entrance to the ________. a. oviducts b. vagina c. uterus d. scrotum
> Cells lining the epididymis secrete a glycoprotein (beta-defensin) that coats sperm and facilitates their passage through cervical mucus. There are two common alleles for human beta-defensin: a wild-type allele (wt) and an allele with a deletion (del). T
> Some sperm mitochondria enter an egg during fertilization, but as sperm mature these mitochondria are tagged with a protein (ubiquitin) that marks them for destruction. What organelle carries out this destruction process?
> The ______ is a genetic dead end. a. polar body b. oocyte c. ovum d. sperm
> Cells lining the epididymis secrete a glycoprotein (beta-defensin) that coats sperm and facilitates their passage through cervical mucus. There are two common alleles for human beta-defensin: a wild-type allele (wt) and an allele with a deletion (del). T
> Fraternal twins are nonidentical siblings that form when two eggs mature and are released and fertilized at the same time. Explain why an increased level of FSH raises the likelihood of fraternal twins.
> Global climate change is causing ________. a. a decrease in sea level b. glacial melting c. acid rain d. all of the above
> Sexual reproduction ______. a. requires formation of gametes by meiosis b. produces offspring identical in their traits c. occurs only in vertebrates d. all of the above
> Cells lining the epididymis secrete a glycoprotein (beta-defensin) that coats sperm and facilitates their passage through cervical mucus. There are two common alleles for human beta-defensin: a wild-type allele (wt) and an allele with a deletion (del). T
> Drugs that interfere with sympathetic nerve signals are often prescribed for men who have high blood pressure. How might such drugs impair sexual performance?
> In the ________, neurons are arranged like maps that correspond to different parts of the body surface. a. retina b. somatosensory cortex c. basilar membrane d. occipital lobe
> Chemoreceptors play a role in the sense of ________. a. taste b. smell c. touch d. hearing e. both a and b f. all of the above
> Biological control of pest species __________. a. has no side effects b. involves mutualists c. uses natural enemies d. requires use of chemicals
> The oldest established land communities are _________. a. in the Arctic b. in temperate zones c. in the tropics d. on volcanic islands
> _________ steal parental care. a. Mutualists b. Commensalists c. Brood parasites d. Predators
> If you remove a species from a community, the population size of its main __________ is likely to increase. a. parasite b. competitor c. predator
> Species richness is greatest in communities __________. a. near the equator b. in temperate regions c. near the poles d. that recently formed
