________ is dependent on antibodies being capable of binding more than one antigen.
A) Complement activation
B) Agglutination
C) Neutralization
D) Opsonization
E) Enhanced NK cell activity
Answer: B) Agglutination
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Why do plants use cotransporters instead of ion channels to transfer anions into cells?
A) Cotransporters are able to transfer anions against the membrane potential gradient, but ion channels cannot. B) Cotransporters can transfer ions across cell membranes, but ion channels cannot transport ions across cell membranes. C) Cotransporters are able to transfer anions against the proton gradient, but ion channels cannot. D) Anions are too bulky to be transported by ion channels.
Which of the following is NOT a tracheophyte?
A. a fern B. a liverwort C. a horsetail D. a conifer E. an oak tree
When a person straightens her arm, she is flexing the triceps brachii. During this movement, the triceps are referred to as the
A. tendon. B. antagonist. C. agonist. D. All of these. E. None of these.
Molecular/structural orientations (gradients) in an egg are thought to play a significant role in development. What is the origin of such gradients?
A) During early development, the nucleus is placed into position of the highest concentration. B) The side facing up has the lowest concentration of molecules. C) When an egg is fertilized, the gradient is set up based on the side of the egg on which the most mitochondria reside. D) During formation of the egg, nutritional as well as informational molecules (RNAs) are placed in appropriate positions for the development of the embryo. E) Where the sperm penetrated the egg is the area of highest concentration.