Eukaryotic gene regulation differs from prokaryotic gene regulation in that:
A: transcription and translation occur at the same location in eukaryotes, but at different locations in prokaryotes.
B: transcription of eukaryotic genes is affected by DNA methylation and modification of chromatin structure.
C: many eukaryotic genes are organized as operons and prokaryotic genes are not.
D: there is no negative control in eukaryotes.
E :there is no positive control in prokaryotes.
Answer: B: transcription of eukaryotic genes is affected by DNA methylation and modification of chromatin structure.
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Which of the following is true of purines?
A) Cytosine is a purine. B) Adenine's bonding to thymine is stronger than is guanine's to cytosine. C) Purines have a double-ringed structure. D) Both adenine and thymine are purines. E) Purines bind readily to deoxyribose but not to ribose.
What type of thinking is required?
What will be an ideal response?
Integral membrane proteins are differentiated from peripheral membrane proteins due to the fact that integral membrane proteins are ________ while peripheral membrane proteins are ________
a. entirely hydrophilic / entirely hydrophobic b. permanently attached to the bilayer / temporarily attached to one of the bilayer's surfaces c. temporarily attached to one of the bilayer's surfaces / permanently attached to the bilayer d. always either enzymes or receptors / always either active or passive transporters
A person with carbohydrates A and B on the surface of their red blood cells will have which of the following blood types?
A. Blood type A, as A is dominant over B B. Blood type O, as A and B cancel each other out C. Blood type B, as B is dominant over A D. Blood type AB, as both A and B are present