Which statement about carbohydrates is true?
a. Carbohydrates provide structural support to organisms.
b. Carbohydrates are nonpolar and insoluble in water.
c. All carbohydrates are considered micromolecules.
d. All carbohydrates are arranged in a linear sequence.
a. Carbohydrates provide structural support to organisms.
Carbohydrates provide structural support to organisms.
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A skeleton has foramen magnum near the rear of the skull; this indicates the skeletal remains may be those of a
A. human. B. gorilla. C. dog. D. monkey. E. rat.
What molecules are scientists currently trying to use to power nanotechnology devices, such as microscopic robots?
A) DNA B) Enzymes C) Lipids D) Cell membranes
Steroid hormones usually act via receptors that
a. are coupled to G proteins that activate adenylyl cyclase. b. activate tyrosine kinases. c. bind to DNA. d. activate phospholipase C.
All of the following are true of the classical pathway of complement activation except __________.
A) activated C1 activates C2 and C4 B) C3 is the first component to be activated C) C5b joins C6, C7, C8, and C9 to form the membrane attack complex D) C1 is activated by an antigen-antibody complex E) activated C2a and C4b activate C3