The frequency of heterozygotes for cystic fibrosis shows ethnic variations
a. True
b. False
Indicate whether the statement is true or false
True
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Which of the following RNA products are least likely to be synthesized by RNA polymerase II eukaryotic cells?
A. noncoding RNAs B. microRNA C. mRNA D. tRNA E. None of the choices given is a RNA polymerase II product.
Bilateria are characterized by
A. a plane of symmetry that forms mirror images around a vertical plane in the midline. B. a plane of symmetry that forms mirror images around a horizontal plane in the midline. C. a plane of symmetry around a transverse plane across the center of the body so that the front and back halves are mirror images. D. a plane of symmetry that forms mirror images around an oblique plane in the midline. E. a plane of symmetry that forms mirror images around any plane through the longitudinal midline of the body.
The normal functions of Spo11 and Cas9 enzymes are different because
A) Spo11 produces double-strand breaks during meiosis, whereas Cas9 functions during mitosis. B) Spo11 produces site-specific double-strand breaks during meiosis, whereas Cas9 breaks DNA at random genomic locations. C) Spo11 produces double-strand breaks in many genomic locations during meiosis, whereas Cas9 is targeted to specific sequences by a CRISPR RNA. D) Spo11 produces double-strand breaks at sequences targeted by RNAs expressed during meiosis, whereas Cas9 has the ability to recognize DNA sequences without an RNA. E) Spo11 is unique to yeast, whereas Cas9 occurs in most higher eukaryotes.
The trp operon is typically characterized as being both under negative control and repressible
Indicate whether the statement is true or false