A substance is added to a protein sample that does not alter the composition or amino acid sequence of the protein itself, but changes its three-dimensional structure. Which of the following was altered by the substance?
A. Hydrogen bonds
B. Covalent bonds
C. Ionic bonds
D. Oxygen double bonds
Answer: A
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In what developmental stage does the human embryo implant in the wall of the uterus?
A. As a zygote B. During organogenesis C. In the gastrula stage D. In the blastocyst stage E. In the morula stage
Answer the following statements true (T) or false (F)
1. Cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle. 2. Anastomoses among coronary arterial branches provide collateral routes for blood delivery to the heart muscle 3. Congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues 4. Tissues damaged by myocardial infarction are replaced by connective tissue. 5. The left side of the heart pumps the same volume of blood as the right.
Unlike the small intestine, the large intestine has pouches along its length called what?
A. Circular folds B. Haustra C. Cecae D. Omental appendages E. Teniae coli
Which structure surrounds the proximal and distal tubules?
A) Vasa recta B) Nephron loop C) Glomerulus D) Peritubular capillaries