Which class of RNA carries protein-building codes from DNA?
A) mRNA
B) tRNA
C) rRNA
D) all of the choices
Answer: A) mRNA
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The primer for retrovirus reverse transcription is a specific
A) tRNA encoded by the cell. B) tRNA encoded by the virus. C) nuclear tRNA. D) nuclear tDNA.
Which of the following is NOT a function of the extracellular matrix?
A. provides strength B. provides structural support C. provides organization of cells throughout the organism D. provides an important source of energy for the organism E. cell signaling
Why does countercurrent exchange optimize gas exchange across some gills?
a. It sustains an optimal thermal environment for gas exchange. b. It optimizes perfusion to the respiratory surface. c. It sustains an optimal respiratory gas concentration gradient, allowing diffusion to occur across the entire respiratory surface. d. It optimizes delivery of the respiratory medium to the respiratory surface. e. It minimizes diffusional area.
Pax-6 is a gene that is involved in eye formation in many invertebrates, such as Drosophila. Pax-6 is also found in vertebrates. A Pax-6 gene from a mouse can be expressed in a fly and the protein (PAX-6 ) leads to a compound fly eye
This information suggests which of the following? A) Pax-6 genes are identical in nucleotide sequence. B) PAX-6 proteins have identical amino acid sequences. C) Pax-6 is highly conserved and shows shared evolutionary ancestry. D) PAX-6 proteins are different for formation of different kinds of eyes.