SC160 Basic Biology Online Exam 3 Answers (Ashworth College) EXAM 4 Part 1 of 2 - 100

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SC160 Basic Biology Online Exam 3 Answers (Ashworth College)

EXAM 4

Part 1 of 2 - 100.0/ 100.0 Points   Question 1 of 40 5.0/ 5.0 Points The ultimate source of the energy in food is:     A. the sun.     B. producers.     C. ATP.     D. consumers.     Question 2 of 40 5.0/ 5.0 Points Which of the following occurs during prophase?     A. Chromosomes line up on the midline of the cell.     B. The nuclear envelope forms.     C. Sister chromatids separate.     D. The mitotic spindle begins to form.     Question 3 of 40 5.0/ 5.0 Points Sexual intercourse in humans:     A. allows a haploid sperm cell to fertilize a haploid egg cell.     B. produces a haploid individual.     C. produces an individual with 23 chromosomes.     D. combines two diploid gametes, producing a zygote.     Question 4 of 40 5.0/ 5.0 Points A cell that completed the cell cycle without undergoing cytokinesis would:     A. have less genetic material than it started with.     B. not have completed anaphase.     C. have its chromosomes lined up in the middle of the cell.     D. have two nuclei.     Question 5 of 40 5.0/ 5.0 Points When a molecule absorbs a photon, one of its electrons is raised to the __________ state.     A. energetic     B. quantum     C. higher     D. excited     Question 6 of 40 5.0/ 5.0 Points What is responsible for the yellow-orange coloration of leaves in the fall?     A. RuBP     B. Chlorophyll a     C. Carotenoids     D. Chlorophyll b     Question 7 of 40 5.0/ 5.0 Points Human muscle cells use lactic acid fermentation to:     A. produce more ATP than is possible through aerobic respiration.     B. produce ATP using the electron transport chain.     C. regenerate NADH.     D. produce ATP without O2.     Question 8 of 40 5.0/ 5.0 Points Chromosomes that do not determine the sex of an individual are called:     A. homologous chromosomes.     B. nonhomologous chromosomes.     C. sex chromosomes.     D. autosomes.     Question 9 of 40 5.0/ 5.0 Points A(n) __________ is an example of an organism that can sometimes reproduce asexually.     A. cat     B. human     C. Komodo dragon     D. mouse     Question 10 of 40 5.0/ 5.0 Points One difference between mitosis and meiosis is:     A. mitosis produces cells genetically identical to the parent cell, but meiosis does not.     B. mitosis produces more daughter cells than meiosis.     C. mitosis produces haploid cells, but meiosis produces diploid cells.     D. mitosis requires only one parent cell, but meiosis requires two parent cells.     Question 11 of 40 5.0/ 5.0 Points Anaerobic respiration produces a maximum of __________ ATP per glucose.     A. 2     B. 4     C. 10     D. 38     Question 12 of 40 5.0/ 5.0 Points What waste product do yeast produce under anaerobic conditions?     A. Ethyl alcohol     B. Pyruvic acid     C. Lactic acid     D. Creatine     Question 13 of 40 5.0/ 5.0 Points How many chromosomes does an individual with Turner syndrome have?     A. 2n + 1     B. n + 1     C. 2n - 1     D. n - 1     Question 14 of 40 5.0/ 5.0 Points A product of glycolysis is:     A. lactic acid.     B. ethyl alcohol.     C. O2.     D. pyruvic acid.     Question 15 of 40 5.0/ 5.0 Points During metaphase:     A. the nuclear envelope breaks up.     B. sister chromatids separate.     C. centromeres divide.     D. chromosomes line up in the middle of the cell.     Question 16 of 40 5.0/ 5.0 Points What is the difference between a benign and a malignant tumor?     A. Benign tumors are composed of cancer cells; malignant tumors are not.     B. Benign tumors are not the result of a failure of a cell cycle control system; malignant tumors are.     C. Benign tumors do not metastasize; malignant tumors do.     D. Benign tumors do not form lumps; malignant tumors do form lumps.     Question 17 of 40 5.0/ 5.0 Points Where are photosystems located?     A. Chlorophyll     B. Thylakoid membrane     C. Cristae     D. Stroma     Question 18 of 40 5.0/ 5.0 Points A horse eating some hay is an example of:     A. an autotroph eating a producer.     B. an autotroph eating a consumer.     C. a consumer eating a producer.     D. a consumer eating a heterotroph.     Question 19 of 40 5.0/ 5.0 Points A child is born with a rare disease in which mitochondria are missing from certain skeletal muscle cells. Physicians find that the muscle cells function. Not surprisingly, they also find that:     A. the muscles contain large amounts of lactic acid following even mild physical exercise.     B. the muscles contain large amounts of carbon dioxide following even mild physical exercise.     C. the muscles require extremely high levels of oxygen to function.     D. the muscle cells cannot split glucose to pyruvic acid.     Question 20 of 40 5.0/ 5.0 Points What name is given to a discrete packet of light?     A. Phaser     B. Wavelength     C. Photon     D. Quantum

Part 2 of 2 - 100.0/ 100.0 Points   Question 21 of 40 5.0/ 5.0 Points A couple has two female children. What is the probability that their next child will be male?     A. 25%     B. 50%     C. 33%     D. 67%     Question 22 of 40 5.0/ 5.0 Points The region of DNA where RNA synthesis begins is the:     A. start codon.     B. promoter.     C. initiator.     D. processor.     Question 23 of 40 5.0/ 5.0 Points The "master control genes" that regulate other genes, which determine what body parts will develop in which locations, are called:     A. enhancers.     B. homeotic genes.     C. oncogenes.     D. operons.     Question 24 of 40 5.0/ 5.0 Points Which of these techniques could tell you how gene expression differs between individuals with and without cystic fibrosis?     A. Therapeutic cloning     B. DNA microarray     C. Reproductive cloning     D. Karyotyping     Question 25 of 40 5.0/ 5.0 Points Which of the following enzymes is responsible for RNA synthesis?     A. RNase     B. RNA helicase     C. RNA ligase     D. RNA polymerase     Question 26 of 40 5.0/ 5.0 Points According to Mendel's law of segregation,:     A. two alleles segregate into each gamete.     B. more gametes carrying the dominant allele are produced than gametes carrying the recessive allele.     C. gametes have one copy of each allele.     D. gametes are diploid.     Question 27 of 40 5.0/ 5.0 Points Transcription is the:     A. manufacture of a strand of RNA complementary to a strand of DNA.     B. manufacture of two new DNA double helices that are identical to an old DNA double helix.     C. modification of a strand of RNA prior to the manufacture of a protein.     D. manufacture of a protein based on information carried by RNA.     Question 28 of 40 5.0/ 5.0 Points Which risk factors are associated with cancer of the colon and rectum?     A. Tobacco     B. Viruses     C. UV radiation     D. Dietary fat     Question 29 of 40 5.0/ 5.0 Points The __________ is most commonly found in nature.     A. recessive trait     B. wild-type trait     C. parental     D. dominant trait     Question 30 of 40 5.0/ 5.0 Points Reproductive cloning can:     A. reacquire the genes it lost during the course of development.     B. come from an early stage of embryonic development.     C. be differentiated.     D. be implanted in the egg of an organism that is capable of regenerating lost body parts.     Question 31 of 40 5.0/ 5.0 Points The recombination frequency between gene B and gene C is 11%. The recombination frequency between gene B and gene D is 5%. The recombination frequency between gene C and gene D is 15%. What would be the arrangement of these genes on a linkage map?     A. CDB     B. DBC     C. BCD     D. More information is needed.     Question 32 of 40 5.0/ 5.0 Points In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?     A. DD     B. Dd     C. dd     D. DI     Question 33 of 40 5.0/ 5.0 Points In eukaryotic cells, repressor proteins inhibit transcription by binding to:     A. silencers.     B. enhancers.     C. regulators.     D. operators.     Question 34 of 40 5.0/ 5.0 Points Which of these is most likely to cause the development of a six-legged frog?     A. Mutation of homeotic genes     B. Artificial selection     C. Dietary supplementation     D. Conversion of a proto-oncogene to an oncogene     Question 35 of 40 5.0/ 5.0 Points Which of the following turns off transcription by binding to the operator?     A. RNA polymerase     B. Repressor     C. Promoter     D. Lactose     Question 36 of 40 5.0/ 5.0 Points __________ genes violate Mendel's principle of independent assortment.     A. Codominant     B. Linked     C. Recessive     D. Pleiotropic     Question 37 of 40 5.0/ 5.0 Points An individual with the blood group genotype LMLN has the phenotype MN. What is the relationship between the LM and LN alleles?     A. Codominance     B. Pleiotropy     C. LN is dominant     D. Incomplete dominance     Question 38 of 40 5.0/ 5.0 Points A(n) __________ is to bacteria as a __________ is to animal cells.     A. retrovirus; virus     B. phage; prophage     C. prophage; provirus     D. RNA virus; DNA virus     Question 39 of 40 5.0/ 5.0 Points More people die of __________ cancer than of any other cancer.     A. lung     B. skin     C. pancreatic     D. breast     Question 40 of 40 5.0/ 5.0 Points Which of the following techniques is used to collect fetal cells during pregnancy for genetic testing?     A. Testcross     B. Dihybrid cross     C. Amniocentesis     D. Pedigree analysis