Which of the following statements is FALSE?
A) The more highly evolved a species is, the more chromosomes it possesses.
B) The number of chromosomes is the same for all members of a species.
C) Germ cells contain half as many chromosomes as somatic cells.
D) The number of chromosomes remains constant throughout a life cycle.
E) More than 1,000 chromosomes are found in some organisms.
A
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Which one of the following pairs would be classified as isotopes of each other?
A. H and H+ B. Na+ and Cl- C. C and Si D. 12C and 13C E. H and H+, Na+ and Cl-, C and Si, 12C and 13C
Cytokines assist in regulating white blood cell formation.
Answer the following statement true (T) or false (F)
If oxygen is absent during the second stage of cellular respiration,
A.) fermentation will occur. B.) the Krebs cycle begins. C.) the electron transport chain works more efficiently. D.) glycolysis stops.
In which type of microscopy do the specimens appear to be three-dimensional (3-D), allowing their external features to be viewed best?
a. Scanning electron microscopy (SEM) b. Transmission electron microscopy (TEM) c. Phase-contrast microscopy d. Darkfield microscopy