Which of the following is not a step in binary fission of bacterial cells?
A. Protein band forms in the center of the cell to mark the division site.
B. Septum formation separates the cytoplasm of the daughter cells.
C. Mitotic spindle segregates daughter chromosomes.
D. Chromosome is replicated.
Answer: C
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Cartilage injuries do not repair themselves because ________. a. All of these choices are reasons cartilage injuries do not repair themselves
b. cartilage does not receive nutrients very easily c. cartilage does not contain blood vessels d. None of these are reasons as cartilage does heal itself. e. cartilage does not divide in adults
Habitat fragmentation can reduce biodiversity by
a. creating patches too small to maintain optimal breeding conditions. b. increasing the effects of chemical pollution. c. eliminating vast tracts of forests. d. introducing exotic species into a habitat. e. doing all of these.
Which characteristic is associated with a benign tumor?
a. rapid growth b. poor cell differentiation c. expansion within the same tissue d. severe dysplasia e. metastasis
The organ that performs filtration of blood, reabsorption, and secretion in vertebrates is the ________.
A. small intestine B. liver C. large intestine D. kidney E. pancreas