An age pyramid with a broad base that quickly slopes up to a narrow top would be indicative of ________.
A. an industrialized nation
B. a population with a high average age
C. a population with a high survivorship of older adults
D. a developing nation
Answer: D
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Structures that have no apparent function but had a function in ancestral species are
A. the fossil record. B. the molecular record. C. homology. D. development. E. vestigial structures.
The ________ in sperm whales is thought to play a part in the whale's echolocation system
a. rostrum b. ambergris c. spermaceti d. melon
A researcher has discovered a new ligand that can pass through the cell membrane and bind to a receptor in the nucleus. Which of the following statements is FALSE regarding this ligand?
a) This ligand is likely a steroid. b) This ligand is likely nonpolar. c) This ligand likely plays a role in transcription. d) This ligand likely has a similar structure to cholesterol e) This ligand likely binds to a transmembrane receptor.
The purpose of an incubator is to recreate the proper growth conditions of a bacterial sample in order to promote bacterial growth.
a. true b. false