If we are only able to observe a population’s phenotypes, which frequencies of genotypes can we know?
a. both homozygous dominant and recessive
b. only homozygous dominant
c. only homozygous recessive
d. both homozygous and heterozygous
c. only homozygous recessive
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True or false: The number of polypeptides possible with 50 amino acids would be calculated as 5020
A. true B. false
Some scientists have suggested that recent outbreaks of sudden oak disease could be fought through the creation of transgenic plants with genetic resistance to sudden oak disease. What would be the most likely source of this genetic resistance?
A. a species of aphid with resistance to sudden oak disease B. entirely new genes created in a lab and inserted into the oak genome C. other tree species with unusually high levels of host plant resistance D. domesticated apple trees adapted to North America E. the original host species in the native region of the disease
Square planar arrangement of cells that forms when round bacteria remain attached to each other during reproduction are called
A. streptococci. B. sarcinae. C. tetrads. D. staphylococci.
What is mechanical digestion?
A. The use of villi to break down food B. The use of physical actions to break down food C. The absorption of food in the small intestine D. The breakdown of food by enzymes