Which of the following is a true about the members of Kingdom Fungi?
A) All members are photosynthetic.
B) Absorption of dissolved organic matter through cell wall.
C) Absorption of dissolved inorganic matter.
D) All members are microscopic.
E) All members are macroscopic.
Ans: B) Absorption of dissolved organic matter through cell wall.
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The E. coli chromosome is a circular double-stranded DNA, 4.6 × 106 in length. If the superhelical density (?) is
-0.05, what is the linking number for this supercoiled molecule? A. 460,000 B. 438,095 C. 416,190 D. 219,050 E. 21,905
Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few
inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006 . What element does an atom of 210Po change into after it emits an alpha particle? What will be an ideal response?
Cytokinins are water-soluble hormones produced in the root apical meristem and stimulate the growth of lateral buds. How do cytokinins reach the lateral buds?
A. by diffusion as a gas B. through the phloem C. through the xylem D. through the phloem and xylem E. through the phloem and by diffusion as a gas
Which of the following does NOT lead to development of penicillin resistance?
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