Which dissolved gas cannot be transported by hemoglobin?
A. Nitric acid (NO)
B. Oxygen (O2)
C. Nitrogen (N2)
D. Carbon dioxide (CO2)
E. Carbon monoxide (CO)
Answer: C
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Not every piece of DNA is used in a cell to make proteins because
A. some of the DNA is used for regulation of gene expression. B. not all genes are needed in every cell. C. some sequences are needed to stabilize the end of the chromosomes. D. All of the choices are correct.
Which stage in cellular respiration directly requires the presence of O2?
A. Glycolysis B. The Krebs cycle C. Electron transport D. Both a and b are correct.
Why is visualization not sufficient to properly identify bacteria?
a. Identification is only needed in clinical specimens. b. Not all bacteria can be seen with a light microscope. c. Many unrelated bacteria can share the same shape. d. Bacteria have a limited set of shapes. e. Bacteria have a limited set of shapes and many unrelated bacteria share the same shape.
During which of the following stages do cells of identical genetic makeup become structurally and functionally different from one another according to the genetically controlled developmental program of the species:
a. cleavage b. cell differentiation c. morphogenesis d. metamorphosis e. ovulation