Which of the following does not occur before a eukaryotic mRNA is exported from the nucleus?
(a) The ribosome binds to the mRNA.
(b) The mRNA is polyadenylated at its 3? end.
(c) 7-methylguanosine is added in a 5?-to-5? linkage to the mRNA.
(d) RNA polymerase dissociates.
(a) Ribosomes are in the cytosol and will bind to the mRNA once it has been exported from the nucleus.
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Earthworms use ________ as their respiratory surface
A) lungs B) gills C) their skin D) tracheae
Which cutaneous receptors are sensitive to pressure?
A. Pacinian corpuscles and Ruffini endings B. Krause end bulbs and Merkel disks C. Root hair plexus and Krause end bulbs D. Pacinian corpuscles and Meissner corpuscles E. Ruffini endings and Merkel disks
In the light-dependent reactions of photosynthesis,
a) oxygen is used to synthesize sugars. b) carbon dioxide is used to synthesize sugars. c) glucose is oxidized. d) ADP is converted to ATP.
Which of the following are true statements about the carbon cycle? (Check all that apply.)A) Carbon and nitrogen fixation are both facilitated by microbes.B) Burning of gasoline is a contributor to the current imbalance in the carbon cycle.C) Replacing rainforest with farms decreases atmospheric CO2 levels.D) In water, inorganic carbon exists in two different forms, both of which can be used by autotrophs.E) Carbon cycles locally.
What will be an ideal response?