WGU BIOLOGY EXAM

WGU BIOLOGY EXAM Which cell found in phloem tissue has a nucleus? - CORRECT ANSWER-companion cell Which of the following is a monocot? - CORRECT ANSWER-Rose Which events and features are correctly associated with the roots during the pressureflow model of phloem transport? - CORRECT ANSWER-Sugar is stored in the sink. Cells use the sugar for cellular respiration. Water exits by osmosis and returns to the xylem. Girdling a tree involves cutting a deep groove all the way around a tree trunk; it would have the effect of - CORRECT ANSWER-Interrupting the passage of phloem sap and killing the tree. The protective sheath that first surrounds the shoot is called the? - CORRECT ANSWER-Coleoptile Which of the following parts of a plant embryo grows downward? - CORRECT ANSWER-Radicle Which of the following would be considered a Dry Fruit? - CORRECT ANSWER-One that doesn't split open Which of the following plant hormones prevents senescence and can initiate leaf growth? - CORRECT ANSWER-Cytokinin asexual reproduction in plants does NOT involve - CORRECT ANSWER-production of gametes The male gametophyte in flowering plants will be found within the - CORRECT ANSWER-Pollen grain Phylogeny refers to the - CORRECT ANSWER-Evolutionary history of a species If you were assigned the task of constructing a cladogram representing the evolutionary relationship between humans, gorillas, tigers, lizards and sharks, what feature could you use as the shared derived trait? - CORRECT ANSWER-Presence of a jaw Different species of female fireflies flash different patterns during mating season. This is the example of ____isolation? - CORRECT ANSWER-Behavioral Isolation A variety of genotypes and phenotypes in a population is useful because it - CORRECT ANSWER-Allows the species to survive if the environment changes Which fossil evidence is considered an intermediate between reptiles and birds? - CORRECT ANSWER-Archaeopteryx Homologous structures such as bones in wings, flippers, and arms are most closely concerned with - CORRECT ANSWER-Comparative anatomy A student proposes that left-handedness is a recessive trait that is therefore hidden in much of the human population. A survey of a class of 36 students finds that 27 (0.75) are right-handed and 9 (0.25) are left-handed. Using the Hardy-Weinberg formula, what would the expected genotype and allele frequencies be in this theoretical population? - CORRECT ANSWER-0.25 right-handed homozygous, 0.50 heterozygous, and 0.25 recessive homozygous for a 0.5 allele frequency for each allele Which type of organism will form endospores when faced with unfavorable environmental conditions? - CORRECT ANSWER-Bacteria Which statement is true about bacteria? - CORRECT ANSWER-They contain a single, circular DNA molecule as the genetic material. The hypothesis in which small organic molecules exposed to various natural energy sources on Earth could lead to creation of essential amino acids is known as the? - CORRECT ANSWER-Primordial soup hypothesis Which type of sexual exchange occurs among bacteria in which DNA is carried into a bacterial cell by means of a virus? - CORRECT ANSWER-Transduction To be an effective antibiotic or chemotherapeutic agent, it is necessary - CORRECT ANSWER-not to kill the human host or cause allergic reactions AND to be able to kill a bacterial cell only Which feature is lacking in the cell wall of archaea that will distinguish them from the bacteria? - CORRECT ANSWER-Peptidoglycan A new classification by domains separates prokaryotes into - CORRECT ANSWERArchaea and Bacteria Which theory would suggest that both polypeptides and RNA arose at the same time? - CORRECT ANSWER-Alexander Cairns-Smith's simultaneous evolution of polypeptides and RNA The central dogma of genetics states that DNA directs protein synthesis and that information flows from - CORRECT ANSWER-DNA-->RNA-->protein