In the frog genus, when certain species attempts to mate with other species, embryo development is halted at various stages including zygotic segmentation, blastula formation, gastrulation, or in the final phases of embryo development
The stage where the developing frog arrests depends on the species involved in the cross. This is an example of
A. hybrid breakdown.
B. hybrid sterility.
C. hybrid inviability
D. sexual isolation.
C
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Which of the following lists cell types in order from those capable of differentiating into the greatest number of different specialized cells to those capable of differentiating into the least number of different specialized cells?
A. multipotent, pluripotent, totipotent B. pluripotent, totipotent, multipotent C. totipotent, multipotent, pluripotent D. totipotent, pluripotent, multipotent E. multipotent, totipotent, pluripotent
Explain the importance of decomposition in an ecosystem. Cite an application of this process for human systems
What will be an ideal response?
The prick of a sharp pin would be the _________ that starts an action potential on a pain neuron
Fill in the blank(s) with the appropriate word(s)
The following events are associated with muscle contraction. Which one of the following best describes the order in which these events occur, following the initiation of a contraction by a nerve impulse?
1. T tubules transmit electrical impulses throughout the muscle cell. 2. Myosin contacts actin and pulls it toward the center of the sarcomere. 3. Acetylcholine binds to receptors on the muscle. 4. Troponin-tropomyosin complex shifts to expose myosin binding sites. 5. Calcium is released from the sarcoplasmic reticulum. A) 3, 1, 5, 4, 2 B) 1, 3, 5, 2, 4 C) 3, 5, 1, 2, 4 D) 4, 2, 1, 3, 5 E) 3, 5, 1, 4, 2