Plant cell walls contain
A. chitin.
B. collagen.
C. cellulose.
D. proteoglycans.
E. laminins.
Answer: C
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As a consequence of the immune system in humans recognizing dsRNA as foreign,
A) dsRNA viruses rarely infect humans. B) dsRNA viruses quickly transcribe their genes into mRNA which is insensitive to immune responses. C) genomes of RNA viruses are often chemically modified to avoid recognition by human immune cells. D) the genomes of dsRNA viruses must avoid human immune cells during infection, including replicating their genomes within their own nucleocapsids.
Which one of the following statements about RNA is incorrect?
A. The nucleotide at the 5' end of an RNA molecule is typically a nucleoside triphosphate. B. RNA is usually found in double-stranded form, just like DNA. C. RNA molecules are typically shorter than DNA molecules. D. RNA molecules can form base pairs within a single strand. E. RNA molecules are capable of evolving their enzymatic activity over time.
The wings of birds and the wings of bats represent
a. homologous structures. b. analogous structures. c. homoplastic structures. d. vestigial structures. e. structures that are homoplastic but with homologous components.
Loud sounds cause temporary hearing loss due to damage to the:
a. eardrum b. auditory nerve c. cilia of the hair cells d. middle ear bones e. outer ear