What type of respiratory system is found in insects?
1.Countercurrent exchange
2.Internal gills
3.Lungs
4.Trachea
4
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Where would you expect to find an organism possessing a cell membrane composed of large proportions of cholesterol and a predominance of unsaturated fatty acids?
A) frozen wastelands B) temperate regions C) tropical regions D) equatorial regions E) upper levels of an aquatic environment
Determine the number of codon sequences it would require to produce the following amino acid sequence: alanine - proline - serine - isoleucine - stop.
A. It would take 4 codon sequences. B. It would take 3 codon sequences. C. It would take 5 codon sequences. D. It would take 6 codon sequences.
Which one of the following is TRUE regarding nucleotides?
A) There are three different DNA nucleotides. B) DNA nucleotides are assembled into RNA by the process of dehydration synthesis. C) DNA nucleotides contain deoxyribose; RNA nucleotides contain sucrose. D) Nucleotides are bonded together by covalent bonds between the sugars and the phosphates. E) A DNA nucleotide could be made up of ribose, a phosphate, and cytosine.
Heirloom plants are treasured for their flavorful produce and true-breeding progeny that allow gardeners to avoid repeatedly purchasing seed from agribusiness conglomerates. What special effort is required to save seed from heirloom biennials such as carrots?
A. Biennials do not produce seed until the second year of growth. Although carrot roots are normally harvested after one season, they must be allowed to grow another year for seed collection. B. Since carrots are related to wild weeds, they are often cross-pollinated. The green top must be bagged to ensure self-pollination. C. Since carrots build up so much beta-carotene, they do not devote many resources to seed development. A yellow carrot variety will produce better seeds than a darker one. D. Since carrots produce large roots, they do not devote many resources to seed development. The roots must be trimmed before collecting seed.