Nonvascular plants lack _____
a. spores
b. gametes
c. zygotes
d. seeds
e. chloroplasts
ANSWER: d
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Damage to the substantia nigra, a specific region of the basal ganglia, can produce the resting muscle tremors characteristic of what disease?
A. epilepsy B. Parkinson disease C. seizures D. Alzheimer disease E. insomnia
What concepts enable two or more species with similar niches to coexist in a community? Select all that apply.
A. allopatric competition B. resource partitioning C. bottom-up control D. overlapping niches E. character displacement
According to the animation, what does the electron transport chain do to the concentration of hydrogen ions (protons)?
a. The concentration of protons inside the membrane is equal to the concentration outside of the membrane. b. The concentration of protons is higher outside the membrane than inside. c. The concentration of protons is lower outside the membrane than inside.
Microfilaments differ from microtubules in that microfilaments
A) are thicker than microtubules. B) are found only in plants, whereas microtubules are found in both plant and animal cells. C) are mainly composed of actin, whereas microtubules are composed of tubulin. D) help to anchor organelles, whereas microtubules primarily function to help cells change shape and move.