Acquired immune deficiency syndrome (AIDS) is characterized by ____
a. a primary immune deficiency
b. infection with the human immunodeficiency virus (HIV)
c. successful worldwide eradication due to vaccination
d. a high cure rate
e. small, local affected populations
ANSWER: b
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Sugars dissolve well in water because of water's ________.
A. polarity B. cohesiveness C. ionic bonds D. hydrophobic exclusion
The contractile unit of a muscle is the ____.
A. sarcomere B. myosin head C. phosphate group D. myofibril E. actin filaments
You are given a sample of plant tissue and asked to identify the type of tissue and its location in the plant. Using your microscope, you notice two distinct layers of cells. One layer contains cells that are tightly compacted together while the other layer has loosely arranged cells. The cells in both layers contain many chloroplasts. Based on this information, you determine the tissue is
A. vascular tissue from a leaf. B. mesophyll tissue from a stem. C. vascular tissue from a root. D. ground tissue from a stem. E. mesophyll tissue from a leaf.
How is a plant embryo formed?
What will be an ideal response?