As sperm are transported through the ducts system, what secretions are added from which three sets of glands to make
up semen? What will be an ideal response?
ANSWER: The seminal vesicles secrete fructose, a sugar that serves as an energy source for the sperm,
and prostaglandins, locally acting chemical messengers that stimulate contraction of the
female reproductive system to assist in sperm movement. The prostate gland secretes a
milky, alkaline fluid that neutralizes acidic vaginal secretions and enhances sperm viability.
The bulbourethral glands secrete a mucuslike substance that provides lubrication for
intercourse. Together, the sperm and these various glandular secretions make up semen, a
mixture that is about 95% secretions and about 5% spermatozoa.
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An individual that is a genetic mosaic would be the result of a germ cell mutation
Indicate whether the statement is true or false
From the outside of a tree to its center, which of the following is the correct order of appearance?
1. periderm 2. vascular cambium 3. sapwood 4. secondary phloem 5. cork cambium 6. heartwood
a. 1-2-4-5-6-3 b. 1-5-4-2-3-6 c. 1-4-5-2-6-3 d. 1-3-2-5-4-6 e. 1-2-4-5-3-6
A dendrite of a sensory neuron is classified as a(n) ____
a. free nerve ending b. encapsulated receptor c. sensory receptor d. sensory stimulus e. tertiary sensory neuron
What is the MOST likely mode of inheritance in the pedigree in the attachment?
A. autosomal dominant B. X-linked recessive C. autosomal recessive D. X-linked dominant E. Y-linked