The scarcity of which two elements limits plant growth? 

A. oxygen, nitrogen
B. nitrogen, phosphorus
C. oxygen, phosphorus
D. carbon, nitrogen
E. carbon, phosphorus


B. nitrogen, phosphorus

Biology & Microbiology

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Cyanobacteria are prokaryotes that carry out oxygenic photosynthesis like green plants; this means that

A. they produce oxygen as a by-product of photosynthesis. B. they have two distinct photosystems. C. they use water as their electron source. D. All of the choices are correct.

Biology & Microbiology

Which list represents the correct order of structures from outside to inside in the stem of a vascular plant?

a. stele, cortex, epidermis, pith b. epidermis, pith, cortex, stele c. cortex, stele, pith, epidermis d. epidermis, cortex, stele, pith e. stele, epidermis, pith, cortex

Biology & Microbiology

mRNA is made up of introns that have been spliced together

a. True b. False

Biology & Microbiology

Which of the following direct energy transfers is impossible in living systems?

A) light energy to chemical energy B) chemical energy to kinetic energy C) light energy to potential energy D) heat to light energy

Biology & Microbiology