The opening and closing of stomata is regulated by changes in
A. water pressure in guard cells
B. mesophyll cella wall thickness
C. the number of stomata
D. chloroplast function
Ans: A. water pressure in guard cells
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In plants, which of the following are produced by meiosis?
A) haploid sporophytes B) haploid gametes C) diploid gametes D) haploid spores E) diploid spores
Which species of bacteria can produce the highly useful Ti plasmid, used by biologists interested in genetically engineering resistant crops?
A. Phytophthora infestans B. Rhizobium radiobacter C. Striga puccinia D. Magnaporthe grisea E. Xylella fastidiosa
Macrophages are phagocytic cells.
Answer the following statement true (T) or false (F)
The stroma is ________.
a) a collection of pigment and protein molecules that absorbs solar energy b) the central, semi-fluid compartment of the chloroplast c) the innermost portion of the mitochondria d) the portion of the enzyme to which the activator molecule binds