Explain how small noncoding RNAs (sRNAs) can function as both a negative regulator and a positive regulator
What will be an ideal response?
sRNAs can negatively regulate translation by binding to ribosome-binding sequences of mRNA. This blocks the ability for ribosomes to bind to and initiate translation. sRNAs can positively regulate translation by disrupting hairpin loops that usually cover and inhibit the ribosome-binding sequence. However, unmasking this area, the ribosomes are free to bind and activate translation.
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The organ system that is responsible for the physical and chemical breakdown of food and for the absorption, processing, and release of digestive products.
A) Muscular
G) Respiratory
B) Reproductive
H) Skeletal
C) Digestive
I) Nervous
D) Cardiovascular
J) Endocrine
E) Integumentary
K) Lymphatic
F) Urinary
A grouping that includes an ancestor and some, but not all, of the descendants of that ancestor is described as:
A. paraphyletic. B. polyphyletic. C. monophyletic. D. convergent. E. analogous.
A weed in your garden is flowering. When you look very closely, you notice that what you thought was a single flower is actually a very tightly clustered group of tiny yellow tubular flowers. Upon further inspection, you find that each one of these tiny tubular flowers has petals, sepals, stamens, and a single carpel. What is true about this plant?
_____ It has inflorescences. _____ It has perfect flowers. _____ It has imperfect flowers. _____ It has complete flowers. _____ It has incomplete flowers.
Mutations that affect SR proteins will have what kind of effect on gene expression?
A) Polyadenylation at the 3' end will be blocked. B) Ribosomes will not be able to bind to mRNA molecules in the cytoplasm. C) General transcription factors will be unable to bind to promoters. D) RNA polymerase will be unable to terminate transcription. E) Splicing of the mRNA will not be activated.