The nucleoli are found within the nucleus and synthesize ____
a. chromatin
b. mRNA
c. ribosomal subunits
d. genes
e. proteins
C
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Which of the following reflects a primary difference between transmission and scanning electron microscopy?
A. Transmission electron microscopy has high resolution, but scanning electron microscopy does not. B. Transmission electron microscopy shows contrast, but scanning electron microscopy does not. C. Transmission electron microscopy has much higher magnification than scanning electron microscopy. D. Transmission electron microscopy shows two-dimensional ultrastructure, while the scanning electron microscopy shows three-dimensional structure. E. Transmission electron microscopy uses light as an illumination source, while scanning electron microscopy uses electron beams as an illumination source.
A gene that determines the structure of body parts during embryonic development is a
a. homeotic gene. b. homeostatic gene. c. homologous gene. d. homeobox gene. e. homogenous gene.
Which one of the following is a correct molecular formula?
During the glucose activation stage of glycolysis
A) there is a net gain of two ATP molecules. B) there is a net gain of four ATP molecules. C) there is a conversion of two G3P molecules to two pyruvate molecules. D) fructose bisphosphate is split into two G3P molecules. E) two ATP molecules are used to make one fructose bisphosphate molecule.