Glucose and fructose
a. form rings with the same number of carbon
atoms.
b. both have an oxygen atom as part of their ring
structure.
c. are alike in that both have identical functional
groups.
d. contain the same number of hydrogen atoms and
hydroxyl groups.
e. are disaccharides.
Answer: d
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DNA transposable elements (DNA TEs) are:
A. a class of transposable elements that replicate and transpose via DNA replication and repair. B. a class of transposable elements that uses RNA as an intermediate. C. a class of transposable elements that uses DNA as an intermediate. D. a class of transposable elements that uses protein as an intermediate. E. a class of transposable elements that uses ribosomes as an intermediate.
The primary polysaccharides associated with the plant cell wall are the
A) hemicelluloses. B) extensins. C) fibronectins. D) pectins. E) both choices A and D
Which of the following statements about HIV is false?
a. HIV infection results in a dramatic decline in the helper T cell population. b. The first cells targeted by HIV are dendritic cells. c. Cytotoxic T cells are the main cells that attack HIV. d. Dendritic cells transport HIV from the mucosa to the lymph nodes. e. HIV attaches to the CD4 component of TH cells.
Suppose that a group of climate scientists claims that they can predict future impacts of global climate change with 98% accuracy. Why should you be skeptical of this claim?
A) They do not have reliable methods to measure this change. B) Their predictions are based on incomplete information about species diversity and interactions of living organisms with each other and with their environments. C) They should be focusing their predictions based only on climate change in the polar regions where the greatest effects of climate change are experienced. D) They have not accounted for abiotic factors that affect global climate change in their predictions.