In examining an unknown animal species during its embryonic development, how can you be sure what you are looking at is a protostome and not a deuterostome?
A) There is evidence of cephalization.
B) You see a well-developed coelom.
C) The animal is triploblastic.
D) The animal is clearly bilaterally symmetrical.
E) You see a mouth, but not an anus.
Answer: E
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Changes in temperature and pH can decrease an enzymes activity by breaking ________.
A. chemical bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds. E. none of the above is correct.
A(n) ________ muscle has one nucleus per individual cell and is blunt ended with gap junctions between adjoining cells
Fill in the blank(s) with correct word
Action potentials in contractile cardiac muscle cells
A. are much faster than action potentials in skeletal muscle. B. have no plateau phase. C. involve voltage-gated calcium ion channels. D. have sodium ion channels that open and cause repolarization. E. have all of these characteristics.
During oogenesis, oogonia differentiate and become diploid primary oocytes, which divide to produce four diploid secondary oocytes
Indicate whether the statement is true or false