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

Biology & Microbiology

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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.

Biology & Microbiology

Megaspore mother cells are diploid

Indicate whether the statement is true or false

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology