The primary nitrogenous waste product excreted in the urine of all mammals is ________
Fill in the blank(s) with correct word
urea
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Studies of the origin of life on Earth help us to consider what would be required for life elsewhere in the Universe. Which of the following is most likely to be true of extraterrestrial life?
A. Carbon will act as the backbone for organic molecules. B. Light from a nearby star will make photosynthesis possible. C. Oxygen will be used to convert energy in cells. D. Water will not be required to sustain life.
Answer the following statements true (T) or false (F)
1. When Ron Evans generated transgenic mice in which the gene PPAR-delta was constitutively active (i.e., always expressed), he found that these mice showed a shift from fast glycolytic fibers to slow oxidative fibers. Based on this, faster sprint speeds in the transgenic mice would also be predicted. 2. The fact that a quarterback can throw a football at approximately 50 miles per hour means that the muscles powering this throw must also be shortening at 50 miles per hour. 3. Walking or running are more energetically expensive forms of locomotion than either swimming or flying. 4. The only chyme molecule that is absorbed in significant amounts by the stomach is water.
In which major taxonomic group of Archaea are the methanogens found?
a. Crenarchaeota b. Korarchaeota c. Nanoarchaeota d. Euryarchaeota
Recessive alleles seem to vanish in some generations and reappear in later generations because
a) they cannot be expressed in males. b) they are masked by a dominant allele. c) they cannot be expressed in females. d) they cannot be expressed in successive generations. e) they are lost by mutation.