When observing the skeleton of a snake, you see the remains of hip and hind leg bones associated with four legged animals. These bones are called
A. convergent traits.
B. analogous structures.
C. vestigial structures.
D. homologous structures.
E. both homologous and analogous structures.
C. vestigial structures.
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The method of sequencing genomic fragments cloned straight from the genome is:
A. Cytogenetic mapping B. Shotgun sequencing C. Southern blotting D. Polymerase chain reaction
When a cell secretes a growth factor that binds to receptors on its own membrane preventing it from proliferating, this is an example of ____.
A. direct intercellular signaling B. endocrine signaling C. contact-dependent signaling D. paracrine signaling E. autocrine signaling
Which of the following statements about the immune system is correct?
a. Memory cells are involved in a primary immune response. b. Dendritic cells were first identified in the nervous system. c. Interferons are specific proteins that block cell replication at the level of mitosis. d. Natural killer cells are involved in both specific and nonspecific immune responses. e. Defensins are one type of protective protein synthesized by T helper cells.
This behavioral ecologist pioneered the study of seagull nesting behavior.
A. von Frisch B. Wilson C. Lorenz D. Tinbergen