At least some of the cells of a mammalian heart in the final phase of development would most likely be
A. undergoing apoptosis.
B. dividing rapidly.
C. expressing segmentation genes.
D. expressing cardiac-specific transcription factors.
E. either undergoing apoptosis or expressing cardiac-specific transcription factors.
E. either undergoing apoptosis or expressing cardiac-specific transcription factors.
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Which of the following statements is false?
A. The walls of the right ventricle are thicker than the walls of the left ventricle. B. Blood pressure in the pulmonary circulation is lower than blood pressure in the systemic circulation. C. The left ventricle pumps oxygenated blood, whereas the right ventricle pumps deoxygenated blood. D. The systemic blood pressure of a bird is much higher than that of a fish. E. None of the answer options is false.
In eukaryotic cells, which occurs during
mitosis? a. the duplication of chromatids b. the replication of DNA c. synapsis and crossing over d. fragmentation and disappearance of nuclear envelope e. all of these
Which of the following ECG tracings represents electricity flowing over the ventricles?
a. P wave b. QRS wave c. T wave d. P-Q interval e. S-T interval
Lysogeny is an important phenomenon in bacteria and phages. Briefly describe lysogeny
What will be an ideal response?