This arthropod is the vector for Lyme disease
a. spider
b. tick
c. wasp
d. mosquito
e. mites
B
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A protein's ________ structure contains helixes and sheets that result from hydrogen bonding between carboxyl and amino groups of the polypeptide chain.
A. tertiary B. quaternary C. primary D. both secondary and quaternary E. secondary
Oaks, birches and corn produce both staminate and pistillate flowers on the same plant. What term describes this type of plant?
A. monoecious B. dioecious C. hermaphroditic D. complete E. determinant
Which of the following statements best describes the effects of caffeine on the body?
A. Caffeine is only water-soluble, not fat-soluble, so it is less likely to be absorbed into the bloodstream. B. Caffeine is considered a psychoactive drug because it changes brain function. C. Caffeine cannot readily cross the plasma membrane into body cells, so all effects are short-lived. D. Caffeine is a diuretic and can cause extreme water loss. E. In the brain, caffeine activates receptors for adenosine and blocks the action adrenaline.
The retina is composed of four layers of cells, which are the pigmented cells, photoreceptor cells, bipolar cells, and the ganglion cells. Axons of the ganglion cells become the optic nerve
Indicate whether the statement is true or false