A population reaches a stable-age distribution when the
A) population stops growing.
B) birthrate is less than the death rate.
C) net reproductive rate (R0 ) is zero.
D) proportion of individuals in each age group remains the same.
D
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If you were male and sent a biological sample to a DTC (direct-to-consumer) genetic testing service, it could tell you:
A. the possible ethnic origin of your Y chromosome. B. the possible ethnic origin of your X chromosome. C. the possible ethnic origin of your female relatives' X chromosomes. D. the possible ethnic origin of your autosomes. E. the possible ethnic origin of your Y chromosome, your X chromosome, and your female relatives' X chromosomes.
A ________ is a short sequence of amino acids that targets a protein for translation across the endoplasmic reticulum.
Fill in the blank(s) with the appropriate word(s).
What is the difference between animals that exhibit redial versus bilateral symmetry?
A. Radial symmetry is characterized by the animal having a coelom, whereas bilateral symmetry has no coelom in the animal body. B. Radial symmetry only occurs in round organisms like the sponges, whereas bilateral symmetry is common to all of the more complex animals. C. Animals with radial symmetry demonstrate cephalization, whereas those with bilateral symmetry do not. D. Mirrored arrangement of body components is common with radial symmetry, but not found at all in bilateral symmetry. E. Body components are arranged around a central axis in radial symmetry, but are arranged with a distinct left and right in bilateral symmetry.
Oxidation and reduction reactions are chemical processes that result in a gain or loss of
A. protons. B. atoms. C. molecules. D. neutrons. E. electrons.