Photoautotrophs use _______for energy and _______as a carbon source.
a) glucose; CO2
b) light; glucose
c) light; lactic acid
d) light; CO2
Answer: d) light; CO2
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The genetic code is said to be ________ because more than one codon will specify a particular amino acid.
A. ambiguous B. degenerate C. repetitious D. multiplicative
The Cenozoic era, during which the diversity of animals living today arose, has extended from 65 mya to the present. This is approximately ___ of the geologic timescale.
A. 4% B. 15% C. 1.5% D. None of the answer choices is correct. E. 7%
PKU detection includes
a. prenatal karyotyping. b. urine analysis at puberty. c. blood tests at puberty. d. saliva tests. e. urine analysis and blood tests at birth.
When bar-headed geese fly at very high altitudes (possibly over Mount Everest!), they breathe very thin air where the partial pressure of oxygen is very low compared to that at sea level. They are able to do this because they have a modified version of
the hemoglobin protein. To which of the following is their hemoglobin protein most likely similar in terms of its ability to bind oxygen? A) an adult human B) a human fetus C) a bird that lives at sea level D) an earthworm