Rank the following cytoskeletal filaments from smallest to largest in diameter (1 = smallest in diameter, 4 = largest)
______ intermediate filaments
______ microtubules
______ actin filament
______ myofibril
Fill in the blank(s) with correct word
__2___ intermediate filaments (10 nm diameter)
__3___ microtubules (25 nm)
__1___ actin filament (5–9 nm)
__4___ myofibril (1–2 ?m)
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In the photosystem I reaction center, light energy captured by pigment molecules is passed to a special reaction center chlorophyll a called
A. P680. B. P700. C. chlorophyll I. D. chlorophyll II. E. retinal.
Which of the following does not require expenditure of energy?
A. accumulation of ions inside a cell B. transport against a concentration gradient C. flow of sucrose and other carbohydrates once inside the sieve tubes D. the loading and unloading of carbohydrates from the sieve tubes E. opening or closing stomata
Conifers are characterized by all of the
following EXCEPT a. thick cuticles. b. intolerance to warm climates. c. needle-shaped leaves. d. recessed stomata. e. adaptations for conserving water
Based on the criterion of segmentation, which
organism most closely resembles the earliest ancestral arthropod? a. dragonfly b. millipede c. tick d. crab e. scorpion