snRNAs ___________________
(a) are translated into snRNPs.
(b) are important for producing mature mRNA transcripts in bacteria.
(c) are removed by the spliceosome during RNA splicing.
(d) can bind to specific sequences at intron–exon boundaries through complementary base-pairing.
(d) snRNAs are part of the snRNPs, which include proteins and RNA molecules. The proteins within the snRNPs are encoded by their own genes and not translated from snRNPs, which is why choice (a) is incorrect. Bacteria do not have introns, which is why choice (b) is incorrect.
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Metabolism is a unifying characteristic of all cellular organisms
Indicate whether the statement is true or false.
Both honeybees and birds have wings for flight; thus, these structures are homologous in the
two animal groups.
a. true, because the wings have a similar function and thus must be anatomically similar b. false, because the wings look very different between the two groups c. true, because all animals have a common ancestor d. false, because birds and honeybees do not share a common ancestor from which this trait was derived
________, a recombinant clotbusting drug, is used to limit damage to heart muscle by restoring blood flow.
A) Insulin B) Tissue plasminogen activator C) Interleukin-2 D) Glucocerebrosidase
___ allow pythons to detect their prey
a. Mechanoreceptors b. Chemoreceptors c. Thermoreceptors d. Photoreceptors e. Proprioreceptors