Since quantitative traits can be described by a plot of the frequency vs value of the trait since
A. the trait can have a range of values
B. the traits are discrete.
C. the traits are discontinuous
D. the traits are frequently the result of a single gene with more than two alleles.
A
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How do primary producers provide energy for the food chain?
A. They break down organic molecules into inorganic elements. B. They make their own organic molecules via photo- or chemosynthesis. C. They receive energy from secondary consumers. D. They pass on organic substances from primary consumers.
The odontophore of molluscs is part of the:
a. digestive system. b. nervous system. c. excretory system. d. defense system. e. reproductive system.
Some plant secondary metabolites are used as______________
a. fuel c. textiles b. medicines d. flooring
Electron microscopes use electrons rather than light to view a specimen. Some of these microscopes pass a stream of electrons through a specimen. Both the stream of electrons and the specimen must be in a vacuum chamber. What is a limitation of using such an electron microscope?
A) Living specimens cannot be observed. B) Prokaryotic cells cannot be examined. C) Images appear very fuzzy because of low resolution. D) The power of magnification decreases.