In a karyotype of a male, which of the following would indicate an abnormality?
a. one X chromosome and one Y chromosome
b. three copies of chromosome 22
c. 22 pairs of autosomes
d. a total of 46 chromosomes
b. three copies of chromosome 22
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Enzyme specificity refers to the
(a) specific name of each kind of enzyme. (b) fact that enzymes catalyze one particular substrate or a small number of structurally similar substrates. (c) effect of temperature on enzyme activity. (d) effect of pH on enzyme activity.
A xenograft is graft tissue from a donor of one species transplanted to a recipient of another species.
Answer the following statement true (T) or false (F)
In lipid biosynthesis, glycerol is derived from dihydroxyacetone phosphate formed during
a) the Krebs cycle. b) glycolysis. c) the electron transport chain. d) the Calvin-Benson cycle.
Who was the first to observe "animalcules" under the microscope?
A. Antonie van Leeuwenhoek B. Otzi the Iceman C. Marcus Terentius Varro D. Robert Koch