Which of the following best describes siRNA?
A) a double-stranded RNA, one of whose strands can complement and inactivate a sequence of mRNA
B) a single-stranded RNA that can, where it has internal complementary base pairs, fold into cloverleaf patterns
C) a double-stranded RNA that is formed by cleavage of hairpin loops in a larger precursor
D) a portion of rRNA that allows it to bind to several ribosomal proteins in forming large or small subunits
A
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Many species of ants "farm" aphids, protecting them from predation and collecting concentrated sugars (i.e. honeydew) from them. This type of ant/aphid relationship is known as
A. dispersive mutualism. B. parasitism. C. trophic mutualism. D. commensalism. E. defensive mutualism.
Megaspore mother cells are diploid
Indicate whether the statement is true or false
In a photosystem, clusters of chlorophyll a, chlorophyll b, and carotenoid pigments function most like
A) an antenna. B) a propeller on a motorboat. C) a windmill. D) a spring.
Carbon 14 is an unstable isotope of carbon that decays very slowly. Compared to the common, stable carbon 12 isotope, carbon 14 has two additional ______________
(a) electrons. (b) neutrons. (c) protons. (d) ions.