Interleukins and erythropoietin are
a. growth factors.
b. Cdk's.
c. cyclins.
d. antitumor agents.
e. intracellular signaling molecules.
Ans: a. growth factors.
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The exoskeleton of insects is composed mainly of what material?
A. chitin B. calcium carbonate C. hydroxyapatite D. collagen E. waxes
Which of the following is true of phloem?
a. conducts water up the plant b. conducts mineral ions up the plant c. connects with roots d. connects with leaves e. transports plant-manufactured organic products
Which of the following is an incorrect match?
A) Golgi apparatus- protein alteration and packaging B) ribosomes- protein synthesis C) lysosomes- cellular digestion D) mitochondria- production of cellular ATP E) smooth endoplasmic reticulum- storage of water
Which of the following is not a reason we become shorter as we age?
a. As a person ages, the intervertebral discs become thinner and the vertebrae will be stacked closer together, resulting in shorter stature. b. As a person ages, vertebral bodies lose bone mass (osteoporosis) resulting in smaller vertebrae that stack closer together. c. As a person ages, scoliosis may develop resulting in an abnormal spinal curvature and shorter stature. d. As a person ages, the ligaments connecting vertebrae together are weakened, resulting in a more pronounced kyphosis. This posterior curvature of the spine lowers the skull, making you shorter.