Which of the following cell organelles is/are not surrounded by membranes? 1. Lysosomes; 2. Peroxisomes; 3. Mitochondria; 4. Flagellae; 5. Ribsomes
A. 1 and 2
B. 1 and 3
C. 4 and 5
D. 1 and 5
E. 2 and 3
Answer: C. 4 and 5
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Fill in the blank(s) with the appropriate word(s).
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Indicate whether the statement is true or false
Which of the following ensures that cardiomyocytes do not pull apart during muscular contraction?
A. Gap junctions B. Chordae tendinae C. Papillary muscles D. Trabeculae carneae E. Desmosomes
This figure shows a cross section of a vertebra and the spinal cord. What structure does number 1 indicate?
A. Epidural space B. Subarachnoid space C. Dura mater D. Pia mater E. Central canal