Which of the following is characteristic of cardiac muscle but not smooth muscle?
A. Ability of the cells to contract in a coordinated fashion
B. Presence of gap junction cells
C. Involuntary contraction
D. Capability of responding to nervous stimulation
E. Presence of intercalated disks
Answer: E. Presence of intercalated disks
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Which of the following is NOT TRUE regarding the evolutionary trends from ape-like ancestors to modern humans?
A. The evolution of larger brain size facilitated the evolution of bipedal posture. B. The evolution of bi-pedal posture would have facilitated long-distance travel since walking on two legs is more energetically efficient than four legs. C. The evolution of bi-pedal posture would facilitate tool use by freeing up the hands. D. Many primates are partially bi-pedal as indicated by knuckle-walking.
Respond to statements 82–85 with reference to the five plant
macronutrients listed below. a. nitrogen b. potassium c. magnesium d. phosphorus M 82. This nutrient helps to maintain turgor pressure. M 83. This nutrient is an extremely important part of ATP. M 84. This nutrient is an important part of the backbone structure of DNA. M 85. This nutrient is essential to formation of chlorophyll and acts as a cofactor for many enzymes.
The hormones oxytocin and ADH are synthesized in the ____
a. hypothalamus b. posterior pituitary c. anterior pituitary d. adrenal gland e. ovaries
A gene pool is
A. all the genes in a population. B. the genes that are unique to a species. C. a group of species that look alike but are not located in the same area at the same time. D. all the similar genes in a gene family. E. a swimming hole for geneticists.