What type of bonding allows the long, straight
chains of cellulose to lock together tightly?
a. hydrogen
b. polar covalent
c. ionic
d. nonpolar covalent
e. mettalic
A
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You notice that in most biology and genetics textbooks, the authors show that Gregor Mendel used flower color as one of his pairs of traits. The purple flower phenotype is dominant to the white flower phenotype
However, if you go back to Mendel's experiments, you see that he actually studied seed coat color. The purple seed coat phenotype was dominant to the white seed coat phenotype. Mendel did note that plants with purple seed coats had purple flowers and plants with white seed coats had white flowers. Is the gene for seed coat color pleiotropic because it also affects flower color, or are the seed coat color gene and the flower color gene very closely linked? To find out the answer to this question, you assume that the genes for flower color and seed coat color are different genes, and your null hypothesis is that they assort independently. You designate the flower color gene wf and the seed coat color gene sw. Plants that are WF__, SW___ have purple flowers and purple seed coats. Plants that are wf wf, ws ws have white flowers and white seed coats. You do the testcross WF wf, SW sw X wf wf, sw sw and collect 15,206 offspring. What result would tell you that the wf and sw loci are probably the same, pleiotropic locus? A. One of the offspring had white flowers and purple seed coats. B. About half of the offspring had purple flowers and purple seed coats, and all the rest had white flowers and white seed coats C. All of the offspring had purple flowers and purple seed coats. D. None of the offspring had white flowers and white seed coats.
As part of an experiment, researchers grew several different types of cells in the presence of radioactive iodine. After
some time had passed, the cells were washed, and the levels of iodine inside the cell was determined. What is the most plausible explanation for why some cells had higher levels of radioactivity after treatment than others?
a. Cells that had high radioactivity levels after treatment contain iodine transporters. b. Cells that had high radioactivity levels after treatment lack iodine transporters. c. Cells that had high radioactivity levels after treatment have a mutation in genes encoding iodine transporter proteins. d. Cells that had high radioactivity levels after treatment lack clathrin. e. Cells that had high radioactivity levels after treatment lack lysosomes.
Dorothy suffered a serious stroke that destroyed neurons in the swallowing center of her brain. This damage to her brain would prevent _____.
A. mastication B. secretion of saliva C. peristalsis D. elevation of the soft palate E. bolus formation by her tongue Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about swallowing? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Before photosynthetic cells became abundant, were not widespread.
A. cells using aerobic respiration B. chemoautotrophs C. cyanobacteria D. heterotrophs E. cells using anaerobic respiration