In the vascular bundles of most dicot stems, primary phloem differentiates toward the ________ of the stem, while primary xylem differentiates toward the ________ of the stem.
A. outside; middle
B. cork cambium; vascular cambium
C. middle; middle
D. middle; outside
E. shoot tip; roots
Answer: A
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What part of the brain acts to control the pituitary, and many other organs separate from the brain?
a. thalamus b. thyroid c. pineal d. hypothalamus e. adrenal gland
The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that
a. the semiconservative nature of DNA replication was finally demonstrated.
b. it demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system.
c. it confirmed that each cell of a given species contains the same amount of DNA.
d. it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria.
e. it demonstrated that mice can change the hereditary content of bacteria.
During glycolysis, what is the net gain of ATP molecules produced from one glucose molecule?
A) 36 B) 4 C) 34 D) 2 E) No ATP molecules are produced during glycolysis.
Cell motility is an important identifying characteristic in laboratories. What is the best way to determine whether a bacterial strain is motile?
A) Do a simple stain and observe the organisms under phase-contrast microscopy. B) Do a Gram stain and observe the organisms under bright-field microscopy. C) Stab an inoculum into a tube of semisolid medium. D) Inoculate a liquid culture with the organism.