Which of the following lack chlorophyll and are totally dependent on the host plant for water and nutrients?
A. hemiparasites
B. holoparasites
C. all plant parasites
D. root parasites
E. hemiparasites and root parasites
B. holoparasites
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During the early stages of sporulation in Bacillus subtilis, ________ is active in the forespore and ________ is active in the mother cell.
A. ?E; ?F B. ?F; ?K C. ?F; ?E D. ?K; ?F
Filtrate that is removed from the blood is collected
by the a. loop of Henle. b. glomerulus. c. distal tubule. d. proximal tubule. e. Bowman’s capsule.
Greenhouse gasses act to
a. warm the Earth's surface to support life. b. cool the atmosphere. c. block out ultraviolet radiation. d. contribute to acid rain. e. increase carbon monoxide concentrations.
The disease ataxia telangiectasia, which causes nervous system defects and a high frequency of cancer in affected individuals, results from a mutation in the gene for the protein
a. ATM. b. ABS. c. Akt. d. MCM.