Which of the following organs of the endocrine system secretes melatonin?
a. pituitary gland
b. pancreas
c. pineal gland
d. adrenal glands
e. thyroid gland
C
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A fever augments the host's defenses by
A. enhancing microbiostasis. B. enhancing the activity of the immune system. C. stimulating leukocytes into action. D. All of the choices are correct.
The openings in leaves that function to exchange gases are called ____
a. cuticles b. stomata
c. guard cells d. pits e. pores
If a cell begins to divide in an uncontrolled way, it ____
a. will always form a cancerous tumor b. may form a benign tumor c. is a sign of metastasis d. is considered a malignant tumor e. signals uncontrolled cell division in other parts of the body
You are asked to determine if a tissue sample taken from a plant stem comes from a monocot or eudicot. How will you accomplish this?
A. Examine the epidermis and determine the depth of the cuticle layer. B. Locate the vascular bundles and analyze their pattern. C. Determine if the xylem and phloem are located in separate vascular bundles or are bundled together. D. Look at the ground tissue to see if it is arranged in concentric rings or in parallel bundles. E. Examine the vascular cambium and determine if it is divided into segments or is continuous throughout the stem.