If an experimenter interferes with the mesoderm in an embryo, which of the following systems would
NOT be affected by the experimenter?
a. circulatory system
b. muscular system
c. reproductive system
d. integumentary system
e. excretory system
D
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Interneurons are found in the
a. dorsal root. b. spinal cord. c. sensory neurons. d. motor neurons. e. autonomic nervous system.
The process by which a sperm and an egg are united is called _____________
Fill in the blank(s) with the appropriate word(s)
Roots, used for anchoring the plant in soil and enhancing absorption of soil water and nutrients, evolved in the seedless vascular plant phylum ________.
A. Hepatophyta B. Monilophyta C. Bryophyta D. Lucophyta E. Anthocerophyta
Plasma membranes are selectively permeable. This means that
A) anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy. B) the plasma membrane allows some substances to enter or leave a cell more easily than others. C) glucose cannot enter the cell. D) plasma membranes must be very thick.