Which of the following is most limiting for plant growth, especially in relation to the plant's carbon uptake?
A. phosphorous
B. potassium
C. nitrogen
D. calcium
E. magnesium
C. nitrogen
Nitrogen availability limits plant growth. Nitrogen is a necessary component of proteins (including enzymes) , DNA and other molecules. As carbon dioxide levels rise, plant growth will still be limited by a lack of nitrogen in the soil since photosynthesis does not provide nitrogen to the plant.
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Sieve plates:
A. are modified cell walls that connect sieve elements. B. do not contain plasmodesmata. C. dissolve at sieve tube maturity. D. have solid, impermeable surfaces. E. contain mitochondria and chloroplasts.
The primary factors driving the dynamics of population abundance are the demographic processes of ________ and ________
Fill in the blank(s) with correct word
Rho Family GTPases (Rho, Rac, Cdc42) stimulate cytoskeletal microfilament assembly for all of the following except
A) stress fiber formation. B) lamellipodia formation. C) nuclear envelope breakdown for mitosis. D) cytokinetic furrow formation. E) filopodia formation.
Why can't amphibians be entirely terrestrial?
A) Their limbs are not adapted to support their bodies on land. B) They have a three-chambered heart that is not efficient enough for terrestrial life. C) Their digestion is adapted for consuming aquatic prey. D) Their reproduction requires water to allow fertilization and keep eggs moist. E) They do not have lungs but instead have gills that require water for gas exchange.