Chat with us, powered by LiveChat The structure of valine, an amino acid, is shown. What portion of the valinemole | WriteMoh

The structure of valine, an amino acid, is shown. What portion of the valinemole

The structure of valine, an amino acid, is shown. What portion of the valinemolecule is indicated by the shaded area? Select one:a. amino groupb. carbon chainc. carboxyl groupd. R group Question 2 Not yet answeredPoints out of 5.84 Flag question Question textNucleotides are composed ofSelect one:a. adenosine triphosphate, pentose sugars, and phosphates.b. DNA, ribose sugars and polypeptides. c. nitrogen-containing bases, phosphates, and peptides.d. phosphates, pentose sugars, and nitrogen-containing bases. Question 3 Not yet answeredPoints out of 5.84 Flag question Question textWhat are the primary constituents of cell membranes?Select one:a. carbohydratesb. lipidsc. mineralsd. proteins Question 4 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following is an organic catalyst and usually a protein?Select one:a. ATPb. coenzymec. enzymed. substrate Question 5 Not yet answeredPoints out of 5.84 Flag question Question text Which of the following cell organelles is the site of the citric acid cycle?Select one:a. Golgi apparatusb. mitochondriac. nucleusd. ribosome Question 6 Not yet answeredPoints out of 5.84 Flag question Question textWhat is the degradation product of heme?Select one:a. bile pigmentb. globinc. irond. porphyrin Question 7 Not yet answeredPoints out of 5.84 Flag question Question textDuring photosynthesis, which of the following happens?Select one:a. Carbon dioxide is reduced to glucose.b. Chloroplasts convert solar energy to ADP.c. Hydrogen atoms reduce water to glucose.d. Water is hydrolyzed. Question 8 Not yet answeredPoints out of 5.84 Flag question Question text Which of these are the photosynthetic organs of a plant?Select one:a. conesb. fruitsc. leavesd. seeds Question 9 Not yet answeredPoints out of 5.84 Flag question Question textWhich of these is an end product of photosynthesis?Select one:a. ATPb. carbon dioxidec. glucosed. water Question 10 Not yet answeredPoints out of 5.84 Flag question Question textWhat is the total number of ATP molecules produced by the citric acid cycle?Select one:a. 2b. 4c. 16d. 256 Question 11 Not yet answeredPoints out of 5.84 Flag question Question text In cellular respiration, what percentage of the available energy is transferredfrom glucose to ATP?Select one:a. 17%b. 28%c. 39%d. 63% Question 12 Not yet answeredPoints out of 5.84 Flag question Question textBased on their characteristics, mitochondria could be evolutionary remnants ofwhich type of microorganism?Select one:a. bacteriab. fungic. protozoad. virus Question 13 Not yet answeredPoints out of 5.84 Flag question Question textIn cellular respiration, what is the end product of chemiosmosis?Select one:a. ATPb. glucosec. NADHd. pyruvic acid Question 14 Not yet answeredPoints out of 5.84 Flag question Question text The primary cell wall of plants is composed of which of the following?Select one:a. celluloseb. chitinc. lignind. phospholipid Question 15 Not yet answeredPoints out of 5.84 Flag question Question textWhat unique structural property of cellulose makes it largely indigestible byhumans?Select one:a. addition of chitin, another structural polysaccharideb. alternating positioning of oxygen atoms in linked glucosec. branched chains of linked glucosed. covalent bonding between glucose units, providing extra stability Question 16 Not yet answeredPoints out of 5.84 Flag question Question textHow do peripheral proteins play a role in the plasma membrane?Select one:a. They assist in movement of molecules into the intracellular space.b. They allow ions to flow directly through the membrane.c. They bind with glycoproteins for cell recognition in immune responses.d. They bind with a carrier protein to facilitate membrane transport. Question 17 Not yet answeredPoints out of 5.84 Flag question Question text At the end of meiosis I, how many chromosomes from each homologous parentalpair does one daughter cell contain?Select one:a. 1b. 2c. 3d. 4 Question 18 Not yet answeredPoints out of 5.84 Flag question Question textIn meiosis, crossing-over of genetic material between two non-sister chromatidsoccurs duringSelect one:a. anaphase I.b. metaphase II.c. prophase I.d. telophase II. Question 19 Not yet answeredPoints out of 5.84Flag question Question textIn the phase of mitosis depicted in the figure, which of the following is occurring? Select one:a. Chromatids are crossing over.b. Chromosomes are aligning on the plates.c. Daughter cells are being formed.d. Sister chromatids are separating. Question 20 Not yet answeredPoints out of 5.84Flag question Question textIn the representation of a DNA molecule shown below, what parts of thenucleotides are indicated by the colors red, green, blue, and yellow? Select one:a. nitrogenous baseb. pentose sugarc. phosphated. ribose sugar Question 21 Not yet answeredPoints out of 5.84Flag question Question textUsing the Punnett square, what is the phenotypic ratio of tall plants to shortplants? Select one:a. 1:1b. 2:1c. 3:1d. 1:3 Question 22 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following causes of mutations occurs when nucleotide pairs arereplicated?Select one:a. errors in replicationb. mutagensc. transposonsd. gene expression Question 23 Not yet answeredPoints out of 5.84 Flag question Question text In the following mutation the letter “C” was deleted from the sequence ofcodons. Instead of reading “THE CAT ATE THE RAT” the sequence reads “THE ATATET HER AT.” Which of the following types of mutation is this?Select one:a. deletion mutationb. frameshift mutationc. point mutationd. protein mutation Question 24 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following is an estimate of the number of pairs of DNA bases in thehuman genome?Select one:a. 300,000 pairsb. 5.8 million pairsc. 3.2 billion pairsd. 6.4 trillion pairs Question 25 Not yet answeredPoints out of 5.84 Flag question Question textWhich type of bacteria is produced by biotechnology to express a cloned gene?Select one:a. aerobicb. pathogenicc. peritrichousd. transgenic Question 26 Not yet answeredPoints out of 5.84Flag question Question textIn this illustration of the stem of a plant, the arrow points to which structure? Select one:a. auxiliary budb. nodec. petioled. terminal bud Question 27 Not yet answeredPoints out of 5.84 Flag question Question textWhich type of root is used by certain plants for food storage?Select one:a. adventitiousb. fibrousc. pneumatophored. tap Question 28 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following processes involves evaporation of water from the leaves?Select one:a. osmosisb. respirationc. translocationd. transpiration Question 29 Not yet answeredPoints out of 5.84 Flag question Question text According to the cohesion-tension model, how does xylem transport work inplants?Select one:a. Tension created by atmospheric pressure pushes water up the xylem.b. Tension created by transpiration in the leaves pulls water along the xylem.c. Water entering the root cells creates negative pressure that pushes water upthe xylem.d. Water is actively transported up the xylem by gravity. Question 30 Not yet answeredPoints out of 5.84Flag question Question textWhich of the following types of tropism is exhibited by the plant shown in thephotograph? Select one:a. negative gravitropismb. negative phototropismc. positive phototropismd. positive gravitoprism Question 31 Not yet answeredPoints out of 5.84 Flag question Question textWhich plant hormone facilitates ripening of fruits?Select one:a. abscisic acidb. auxinc. ethylened. gibberellin Question 32 Not yet answeredPoints out of 5.84Flag question Question textReferring to the diagram, what is the correct order of labeling for the boxes (1-4)depicting alternation of generations in flowering plants? Select one:a. (1) meiosis, (2) mitosis, (3) fertilization, (4) mitosisb. (1) meiosis, (2) mitosis, (3) mitosis, (4) meiosisc. (1) mitosis, (2) meiosis, (3) fertilization, (4) mitosisd. (1) mitosis, (2) meiosis, (3) meiosis, (4) mitosis Question 33 Not yet answeredPoints out of 5.84 Flag question Question textIn plant reproduction, what is the eudicot structure that provides nutrition to theembryo?Select one:a. cotyledonb. hypocotylc. plumuled. radicle Question 34 Not yet answeredPoints out of 5.84 Flag question Question text Which of the following parts of a flower protect the bud as the flower develops?Select one:a. anthersb. ovariesc. petalsd. sepals Question 35 Not yet answeredPoints out of 5.84 Flag question Question textAn animal exhibits the following characteristics: tentacles, radial symmetry, andincomplete digestive tract. This animal would be classified in which phylum?Select one:a. Cnidariab. Platyhelminthesc. Poriferad. Rotifera Question 36 Not yet answeredPoints out of 5.84Flag question Question textAccording to the cladogram shown, what two characteristics distinguish lizardsfrom gorillas? Select one:a. an amniotic membrane and hairb. bipedalism and a tailc. hairlessness and a taild. jaws and lungs Question 37 Not yet answeredPoints out of 5.84Flag question Question textIn the context of evolution, which type of selection is depicted in the graph? Select one:a. directional selectionb. disruptive selectionc. natural selectiond. stabilizing selection Question 38 Not yet answeredPoints out of 5.84 Flag question Question textAccording to the Hardy-Weinberg principle, allele frequencies in a gene pool willremain at equilibrium as long as there isSelect one:a. interbreeding between populations.b. frequent mutation.c. genetic drift.d. random mating. Question 39 Not yet answeredPoints out of 5.84 Flag question Question text Spores are found in which part of a mushroom?Select one:a. hyphaeb. lamellaec. pileusd. stipe Question 40 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following types of mammal has a cloaca?Select one:a. marsupialb. monotremec. Placentald. Testudinata Question 41 Not yet answeredPoints out of 5.84 Flag question Question textThe blastopore develops into the anus in which of these invertebrates?Select one:a. cockroachb. earthwormc. sea cucumberd. squid Question 42 Not yet answeredPoints out of 5.84 Flag question Question text According to the replacement model, where did the Homo sapiens in Europemigrate from?Select one:a. Africab. Asiac. Europed. North America Question 43 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following human ancestors were the first to make tools?Select one:a. Ardipithecinesb. Australopithecinesc. Homo erectusd. Homo habilis Question 44 Not yet answeredPoints out of 5.84 Flag question Question textWhich type of tissue lines the cavities of the human body?Select one:a. connectiveb. epithelialc. musculard. nervous Question 45 Not yet answeredPoints out of 5.84 Flag question Question text In the human body, which of these is a matrix of white fibers in connectivetissue?Select one:a. actinb. collagenc. elasticd. myosin Question 46 Not yet answeredPoints out of 5.84 Flag question Question textWhich term refers to the outermost layer of human skin?Select one:a. dermisb. subcutaneousc. epidermisd. follicle Question 47 Not yet answeredPoints out of 5.84 Flag question Question textIn the human respiratory system, exchange of oxygen and carbon dioxide occursin theSelect one:a. alveoli.b. bronchi.c. bronchioles.d. trachea. Question 48 Not yet answeredPoints out of 5.84 Flag question Question text In human reproduction, nutrient-rich blood is transported from the placenta tothe fetus by theSelect one:a. foramen ovale.b. inferior vena cava.c. umbilical artery.d. umbilical vein. Question 49 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following female reproductive organs produces oocytes?Select one:a. cervixb. ovariesc. oviductsd. uterus Question 50 Not yet answeredPoints out of 5.84 Flag question Question textA typical human somatic cell contains how many chromosomes?Select one:a. 22b. 23c. 46d. 47 Question 51 Not yet answeredPoints out of 5.84 Flag question Question text What must primary mRNA undergo to become mature mRNA?Select one:a. processing provided by tRNA moleculesb. processing to remove introns and join exonsc. processing to remove exons and join intronsd. translation into codon of amino acids Question 52 Not yet answeredPoints out of 5.84 Flag question Question textThe addition of a poly-A tail and a guanine cap to a primary mRNA exemplifieswhich level of gene control in eukaryotes?Select one:a. transcriptionalb. post-transcriptionalc. translationald. post-translational Question 53 Not yet answeredPoints out of 5.84Flag question Question textIn the food web shown in the figure, which of the following are the primaryconsumers? Select one:a. bald eagle and ospreyb. phytoplankton, submerged aquatic vegetation, and vegetationc. small planktivorous fish, benthic invertebrates, herbivorous ducks, geese andmute swansd. gulls, wading birds, large piscivorous fish, sea ducks, and tundra swan Question 54 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following is the order of energy flow within an ecosystem?Select one:a. decomposers ? consumers ? producersb. producers ? consumers ? decomposersc. producers ? decomposers ? carnivoresd. decomposers ? producers ? consumers Question 55 Not yet answeredPoints out of 5.84 Flag question Question textIn the ocean, coral reefs are found in which zone?Select one:a. abyssalb. bathypelagicc. epipelagicd. mesopelagic Question 56 Not yet answeredPoints out of 5.84 Flag question Question text Of Earth’s terrestrial biomes, which one is hot in the summer, cold in the winter,gets moderate annual precipitation, and has good soil for agriculture?Select one:a. grasslandsb. shrublandsc. taigad. tundra Question 57 Not yet answeredPoints out of 5.84 Flag question Question textWhich protists are responsible for causing red tide?Select one:a. diatomsb. dinoflagellatesc. flagellatesd. sporozoans Question 58 Not yet answeredPoints out of 5.84 Flag question Question textWhich of the following is a density-dependent regulating factor on the populationof a community?Select one:a. availability of spaceb. competitionc. temperature ranged. water supply Question 59 Not yet answeredPoints out of 5.84 Flag question Question text Which type of learning occurs when a dog stops eating butterflies because hegets sick every time he eats one?Select one:a. classical conditioningb. operant conditioningc. unconditioned responsed. imprinting Question 60 Not yet answeredPoints out of 5.44 Flag question Question textTo communicate the location of a food source, a honey bee returns to its hive andperforms a dance while the other bees gather around and touch it with theirantennae. By touching the returning bee with their antennae, what form ofcommunication are the bees exhibiting?Select one:a. auditoryb. chemicalc. tactiled. visual

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