Which organelle stores most of the DNA in plant and animal cells?
A) Golgi complex
B) mitochondrion
C) chloroplast
D) nucleus
E) lysosome
Answer: D
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Some patients with defective mitochondria in their muscles are extremely limited in their ability to exercise
Muscle biopsy followed by microscopic examination of the mitochondria, reveal that they are of normal size, but their inner membranes are not as convoluted as normal mitochondria. How can this mitochondrial defect cause the described symptoms in the patients? A. It can't. There must be something wrong with something else in the muscle cells. B. A less convoluted membrane is more permeable, so ATP cannot be synthesized efficiently. C. A less convoluted membrane has less surface area, so there is not as much of the ATP-making machinery. D. The less convoluted inner membrane causes the two membranes of a mitochondrion to adhere together, decreasing the mitochondrial effectiveness. E. There is not enough information to determine the cause.
Contact inhibition is best explained by which of the following statements?
a. Contact between neighboring cells triggers reactions leading to inhibition of mitosis. b. As neighboring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur. c. As cell number increases, the protein kinases they produce compete with neighboring cells, inhibiting mitosis. d. As cell number increases, the level of waste products increase, consequently slowing metabolism leading to mitosis. e. As cell number increases, size restrictions inhibit protein synthesis.
How does skeletal muscle contract?
What will be an ideal response?
Continuous traits are often influenced by multiple simple (Mendelian) genes
Indicate whether the statement is true or false