A plant secretes ____ when it needs to respond defensively to a pathogen
a. salicylic acid
b. systemin
c. brassinosteroids
d. mineralocorticoids
e. nitric oxide
ANSWER: a
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Which of the following characteristics made the pea plant Pisum sativum an ideal organism for Mendel's studies?
A. It has the ability to self-fertilize B. It was easy to cross-fertilize one plant with another C. It has easily identifiable traits D. All of the answers are correct
The toxin of Vibrio cholerae causes severe diarrhea because it ____
a. modifies DAG and activates a cascade of protein kinases b. activates phospholipase to produce inositol triphosphate c. decreases the cytosolic concentration of Ca++ d. modifies a G protein involved in regulating salt and water secretion e. binds with adenylyl cyclase and triggers formation of cAMP
Which enzyme is used to bind DNA fragments together?
A) restriction enzyme B) lysozyme C) DNA ligase D) DNA polymerase
A cuboidal shaped cell with six sides is 1 mm × 1 mm × 1 mm. What is the volume and the surface area of the cell?
A. 3 mm3 : 3 mm2 B. 1 mm3 : 3 mm2 C. 3 mm3 : 1 mm2 D. 1 mm3 : 6 mm2