Photorespiration occurs because __________
A. there is more O2 than CO2 in the
atmosphere
B. rubisco is a slow catalyst
C. rubisco is a selective catalyst
D. there is more O2 than CO2 and rubisco is
a slow catalyst
E. there is more O2 than CO2 and rubisco is
a selective catalyst
A
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A common motif found in transposons and integrases is the DDE motif. Which of the following is a true statement with regard to the DDE motif?
A. This motif refers to the three consecutive amino acids that are found in the primary sequence of transposons and integrases. B. This motif refers to the presence of three amino acids not arranged consecutively in the proteins primary sequence but present together in the active site. C. The DDE motif is composed of two glutamates and one aspartate. D. Conservation of the DDE motif has not been useful in demonstrating evolutionary relatedness among transposases and integrases. E. The DDE motif is a structural similarity but has no functional relation in transposases and integrases.
Freshwater fishes deal with the osmotic stress of living in hypoosmotic conditions in part by ____
a. active transport of ions into the body through the gills b. excreting nitrogenous wastes through their kidneys as urea c. active transport of ions out of the body by chloride cells d. excreting excess salt through the actions of specialized salt glands in their heads e. maintaining high levels of urea and trimethylamine oxide in body fluids
In an antibody- mediated immune response, what causes effector helper T cells to release cytokines?
a. binding to antigen presenting dendritic cells
b. binding to a bacterial complement c. binding to a naive helper T cell d. binding to a B cell e. engulfing a bacterium
The evaporation of water from internal surfaces of leaves, stems, and other living parts of a plant is called
A) osmosis. B) transpiration. C) diffusion. D) infiltration.