Introns
A) are removed by a complex called the spliceosome.
B) are sometimes left in the mRNA sequence for alternative splicing.
C) are only found in eukaryotes.
D) are considered to simply be junk DNA.
E) are removed from mRNA in the cytoplasm.
Answer: A
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The ____ is an accessory system of vessels and organs that helps balance the fluid content of the blood and surrounding
tissues.
a. circulatory system b. non-circulatory system c. accessory vessel system d. lymphatic system e. heart
If you were to design a long-term research study to determine why there are no human births in Lapland during the months of August, September, and October, you would need to also examine a comparison population of humans in which births took place every month. The primary reason for including a comparison population within the design of this experiment would be to:
A. test the effects of more than one variable at the same time. B. act as a control that would ensure that the results obtained are due to a difference in only one variable. C. prove that there are no births in Lapland during August, September, and October. D. accumulate more facts that could be reported to other scientists.
What two factors are most responsible for the decline in worldwide biodiversity?
What will be an ideal response?
For both actin and microtubule polymerization, nucleotide hydrolysis is important for ______
(a) stabilizing the filaments once they are formed. (b) increasing the rate at which subunits are added to the filaments. (c) promoting nucleation of filaments. (d) decreasing the binding strength between subunits on filaments.