One generalization of the cell theory is that ____
a. all cells have a nucleus
b. all cells have cell walls
c. the cell is the smallest unit that displays the properties of life
d. cells can arise from nonliving matter
e. all cells are microscopic
ANSWER: c
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Answer the following statements true (T) or false (F)
1. A consequence of the tendency of the human to gain excess weight is an increased risk of developing high blood pressure, diabetes, cancer, and heart disease. 2. During hibernation, a bear would be expected to be in the postabsorptive state in terms of nutrient utilization. 3. Triglycerides do not need to be chemically altered or broken down to cross the intestinal epithelium. 4. Animals have the ability to generate glucose from proteins during prolonged postabsorptive states.
Which of the following is a correct sequence of cells in oogenesis?
a. oogonium ? primary oocyte ? secondary oocyte b. oogonium ? secondary oocyte ? primary oocyte c. primary oocyte ? secondary oocyte ? oogonium d. primary oocyte ? oogonium ? secondary oocyte e. secondary oocyte ? primary oocyte??oogonium
During DNA replication in E. coli, what is the role of DnaA?
A) DnaA is a region of DNA recognized by the replisome where replication is initiated. B) DnaA bends DNA, hydrolyzing the hydrogen bonds in the 13-mer region of oriC and creating an open complex. C) DnaA is a helicase that uses ATP to hydrolyze hydrogen bonds and separate DNA strands. D) DnaA carries the helicase protein to the open region of DNA where hydrolysis and strand separation will occur. E) DnaA prevents reannealing of the separated strands so replication can proceed.
All of the following are enzymes that increase virulence EXCEPT
a. proteases. b. nucleases. c. lipases. d. cellulases.