Which of the following is true of the structure of the TPP riboswitch only when bound to thiamine pyrophosphate?
A. The conformation of the riboswitch allows the ribosome to access the Shine-Dalgarno sequence.
B. The riboswitch folding creates a binding site for the ribosome.
C. The riboswitch RNA becomes catalytically active to cleave mRNA.
D. The riboswitch is less susceptible to cleavage by ribonuclease.
D
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The Michaelis constant
A) can be determined using the Lineweaver—Burk plot. B) is equal to twice the Vmax. C) is equal to the substrate concentration at Vmax/2. D) both choices A and C E) choices A, B, and C
The figure below illustrates that
A. genetic changes in an ancestral Pax6 gene contributed to the evolution of the mammal eye, while the Drosphilia eye arose independently.
B. most animal species have eyes with one photoreceptor and one pigment cell.
C. eye complexity has not significantly increased since the late Triassic when most modern insect families arose.
D. the retina and cornea developed first, but then were secondarily lost in insects such as Drosphilia.
E. although the mammal eye possesses more cell types and greater complexity than the Drosphilia eye, both arose from genetic changes to an ancestral Pax6 gene.
Which statement is true?
a. Antibodies are bound to plasma cells. b. Antibody neutralization kills cells that have already been infected. c. Temporary immunity can be transferred between individuals. d. Complement activation occurs within neutrophils.
Each of the following correctly matches a five vesicle stage structure to its three vesicle stage origin, EXCEPT
A. Diencephalon - Forebrain B. Mesencephalon - Midbrain C. Metencephalon - Midbrain D. Myelencephalon - Hindbrain E. Telencephalon - Forebrain