In most green plants, chloroplasts are
A) concentrated in a zone of leaf tissue called the mesophyll.
B) concentrated in a portion of the leaf called the stroma.
C) evenly distributed throughout the leaf tissue.
D) evenly distributed throughout the entire plant.
Answer: A
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Skin is sometimes referred to as the largest organ of the body. Why is skin considered to be an organ and not a tissue or some other structure?
A. Skin consists of multiple cell types functioning as a single integrated unit. B. Skin consists of a single cell type. C. Skin is a vital component of multiple organ systems. D. Skin consists of multiple tissue types that cooperate to perform a specific task.
Most drug-resistant bacteria isolated from patients contain a(n)
A) R plasmid. B) T1 phage. C) reverse transcriptase. D) ?-lactam.
Which of the following is NOT part of the bark
of a tree?
a. secondary phloem b. secondary xylem c. cork cambium d. periderm e. more than one of these is NOT part of the bark of a tree
Refer to Figure 40-1. Which labeled portions of the skin would be affected by UV light?
a. 1 and 5
b. 1 and 15
c. 5 and 15
d. 5 and 14
e. 1, 14, 15