The internal solute concentrations of osmoregulators are:
A. either higher or lower than the solute
concentration of the external environment.
B. similar to the solute concentration of the
external environment.
C. higher than the solute concentration of the
external environment.
D. lower than the solute concentration of the
external environment.
E. None of the answer options is correct.
A
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Reverse-transcriptase PCR ____
a. uses Taq polymerase to produce cDNA copies of RNA transcripts b. uses RNA polymerase to amplify cDNA copies of RNA transcripts c. uses RNA polymerase to produce mRNA copies of a gene d. amplifies cDNA copies of RNA transcripts e. uses reverse transcriptase to produce mRNA copies of a gene
Asexual reproduction in sponges is by binary fission
Indicate whether the statement is true or false
Which is a mechanism by which transposable element mobilization may be controlled by the cell? (Select all that apply.)
A) blocking transcription of transposable element genes B) blocking translation of transposable element transcripts C) alternative splicing of transposable element transcripts D) synthesizing an enzyme that removes transposable elements from the genome E) increasing the mutation rate of transposable element DNA sequences
What is a family tree that is used to follow human matings that have already occurred?
A) test cross B) karyotype C) sex-linked record D) pedigree