Which animal is not a chordate?
a. fish
b. grasshopper
c. frog
d. lancelet
e. lizard
Answer: b. grasshopper
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The IRT1 gene is responsible for most of the iron uptake activity in roots (Vert et al., Plant Cell 14 [2002]:1223—33)
To determine the specificity of the IRT1 transporter in Arabidopsis plants, researchers measured the concentration of manganese, zinc, copper, and cobalt contained in wild-type and irt1-1 mutant plants. What conclusions about IRT1 specificity can you draw from the above data? A) Under iron-deficient conditions, IRT1 is highly specific for iron. B) Under iron-deficient conditions, IRT1 is important for the transport of iron and copper. C) IRT1 is important for the transport of iron and copper independent of iron concentration. D) Under iron-deficient conditions, IRT1 is necessary for the transport of iron, zinc, manganese, and cobalt. E) IRT1 participates in the transport of iron, zinc, manganese, and cobalt independent of iron concentration.
A patient with a thyroid tumor has her thyroid gland removed. Without a thyroid gland and without synthroid (a thyroid hormone replacement drug), which of the following is most likely to occur?
A. Her blood TSH (thyroid stimulating hormone) levels will be abnormally high and her energy level will be low. B. Her blood TSH levels will be abnormally high and her metabolic rate will be high. C. Her blood TSH levels will be abnormally low and her energy level will be low. D. Her blood TSH levels will be abnormally low and her metabolic rate will be high. E. Her blood TSH levels will be abnormally high but metabolic rate will be low.
Energy flow in an ecosystem is
a. cyclical. b. one-way. c. two-way. d. reversible under different conditions. e. a conservation mechanism
Which microscope would be used to view cell structures within ultrathin sections of cells?
A. Lightmicroscopes (Can be any) B. Scanning electron microscope C. Transmission electron microscope