You are a naturalist traveling with a group of explorers in the higher elevations of a jungle. You see an unfamiliar-looking, tall, tree-like plant. It is producing seeds that are attached directly to a stem, but there appears to be no evidence of
flowers associated with the seeds. To which group of plants does the tree belong?
A) hornworts B) ferns C) gymnosperms D) angiosperms
Answer: C
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In water, MgCl2 dissociates into Mg2+ and Cl- . Based on this information what type of bond is involved in the formation of MgCl2?
A. hydrogen B. ionic C. polar covalent D. nonpolar covalent E. electrostatic
____ bacteria are found inside the roots of legumes, where they receive _____ from the host plant
a. Thermophilic; water b. Cyanobacteria; minerals c. Nitrogen-fixing; carbohydrates d. Methane-producing; minerals e. Halophilic; carbohydrates
Why does yogurt taste sharp?
A) It has not been aged long enough to mellow. B) The taste is from the small amount of alcohol it contains, and alcohol tastes sharp. C) The taste is from the large amount of carbon dioxide it contains, and carbon dioxide tastes sharp. D) The taste is from the lactic acid it contains, and acids taste sharp.
Answer the following questions true (T) or false (F)
1. A reversion mutation is when a base-substitution mutation is changed back to the original DNA sequence. 2. Many mutagens cause a rate of mutation that promotes the development of cancers; such mutagens are called carcinogens. 3. DNA transposons rely on the enzyme reverse transcriptase to insert a copy of cDNA into a new location in the genome.