Small RNA molecules (20—30 nucleotides in length) that have recently been found to have biological function include
A) microRNAs (miRNA).
B) silencing RNAs (siRNA).
C) messaging RNAs (mRNA).
D) both choices A and C
E) all of the above
D) both choices A and C
You might also like to view...
A human blastomere is _____
A) an embryonic cell that is smaller than the ovum B) an embryonic structure that includes a fluid-filled cavity C) that part of the acrosome that opens the egg's membrane D) a component of the zona pellucida E) a cell that contains a (degenerating) second polar body
A protein similar to the human Rh blood factor (which is due to a specific set of genes) can be found in many animals. In which of the following is it least likely to be found?
A) chimpanzees B) goats C) dogs D) parrots
When plants reproduce asexually, the offspring are called
A. clones. B. seeds. C. carpels. D. embryos.
Which statement correctly describes the process of crossing over?
A) Pieces of a maternal chromatid break off and swap pieces with its sister chromatid, and then the same occurs between the paternal chromatids. B) Two chromatids (one maternal and one paternal) break off at corresponding points on homologous chromosomes. The pieces of chromatid rejoin to the chromosome in each other's places. C) During replication, a maternal and a paternal chromosome switch places. D) Two alleles exchange positions on a chromosome, creating new recombination frequencies. E) While homologous chromosomes are splitting apart and separating to either end of the new nucleus, two chromosomes switch positions and move toward the ends, opposite from where they were originally headed.