Which of the following is not a major cause of meningitis cases in the United States?
A. Neisseria meningitides
B. Streptococcus pneumoniae
C. Haemophilus influenzae
D. Staphylococcus aureus
Answer: D
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Plant roots that are in a horizontal position grow down because
A. Cells on the upper side elongate more than those on the lower side. B. Auxins are stimulating cells on the lower side to elongate more. C. Auxins are being pulled to the upper side. D. Auxins are having no influence on this process. E. Statoliths are pushing auxins to the upper side.
The genetic code is expressed differently in bacterial and archaeal cells than in eukaryotic cells.
Answer the following statement true (T) or false (F)
Some eukaryotic DNA sequences act as introns in the cells of some tissues and exons in the cells of
other tissues. This allows:a. prevention of harmful mutation. b. regulation of the rate of transcription. c. formation of different types of closely related proteins. d. regulation of the rate of translation. e. repression of DNA replication.
Facilitated diffusion is limited by
A. the number of carrier proteins in the membrane. B. the size of the cell. C. size of the pores in the membrane. D. ATP concentration. E. osmotic pressure.