Which of the following is an organic compound?
A. C6H12O6
B. CO2
C. O2
D. NaCl
E. H2O
Answer: A
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The end of the Permian period was characterized above all by a mass extinction of:
a. shallow-water marine invertebrates b. dinosaurs and other large reptiles c. small mammals d. large mammals
The upper angle between a stem and attached leaf is called a(n)
a. terminal bud. b. internode. c. axil. d. lateral bud. e. node.
The plasma membranes of some plant cells use transport proteins to move protons out of the cell against their concentration gradient (from areas of low proton concentration to areas of high proton concentration). This is an example of:
a) simple diffusion b) active transport. c) endocytosis. d) facilitated diffusion. e) passive transport
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.