Which one of the following statements about RNA is incorrect?
A. The nucleotide at the 5' end of an RNA molecule is typically a nucleoside triphosphate.
B. RNA is usually found in double-stranded form, just like DNA.
C. RNA molecules are typically shorter than DNA molecules.
D. RNA molecules can form base pairs within a single strand.
E. RNA molecules are capable of evolving their enzymatic activity over time.
Answer B
You might also like to view...
Penguins are only found in the Northern Hemisphere
Indicate whether the statement is true or false
Define the following terms: • Estuary • Tidal flat • Salt-wedge estuary
What will be an ideal response?
Multicellular fungi like this mushroom are composed of threadlike structures called
1.Mycelia
2.Hyphae
3.Coenocytes
4.yeasts
Data were collected from the heterocysts of a nitrogen-fixing cyanobacterium inhabiting equatorial ponds. Study the following graph and choose the most likely explanation for the shape of the curve
A) Enough oxygen (O2 ) enters heterocysts during hours of peak photosynthesis to have a somewhat-inhibitory effect on nitrogen fixation. B) Atmospheric nitrogen (N2 ) levels increase at night because plants are no longer metabolizing this gas, so they are not absorbing this gas through their stomata. C) Heterocyst walls become less permeable to nitrogen (N2 ) influx during darkness. D) The amount of fixed nitrogen that is dissolved in the pond water in which the cyanobacteria are growing peaks at the close of the photosynthetic day (1800 hours).