How short must the poly(A) tail get to cause the mRNA to be degraded rapidly?
a) about 75 adenosine residues
b) about 100 adenosine residues
c) about 10 adenosine residues
d) about 30 adenosine residues
e) 1 adenosine residue
Ans: d) about 30 adenosine residues
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A deletion in an operon removes the terminator. How will that affect the transcript that is produced from the operon?
A. The transcript will be produced and normal in length B. The transcript will be produced, but shorter than normal C. The transcript will be produced, but longer than normal D. The transcript will produced, but will contain a deletion E. The transcript will not be produced
It's your birthday and you splurge with a big slice of chocolate cake, heavy on the icing. Shortly afterwards, your blood glucose levels rise until an endocrine mechanism (secretion of insulin) counteracts this rise and glucose levels decline. The initial change in blood glucose and insulin response that follows is an example of:
A. physiological constancy. B. diffusion. C. homeostasis. D. positive feedback. E. lack of homeostasis.
What chemical group is found in a nucleotide but not in a nucleoside?
A.)sugar B.) nitrogen containing base C.) pentose D.) hydroxyl group E.) phosphate
Monocot vascular bundles do not have a vascular cambium between the xylem and phloem. This means that monocots _____
A) are much less efficient at conducting water and sugars B) have very thin stems C) do not produce wood in annual rings D) cannot produce lateral shoots