If the sunflowers represent 2400 calories, how many calories would be available at the level
of the possums that eat spiders?
a. 10
b. 2.4
c. 24
d. 1000
B
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Short-day plants are those that flower only when the night period of a plant is
A. longer than a defined period. B. shorter than 12 hours.C. followed by short periods of light interruptions. D. less than that in summer. E. longer than 12 hours.
Which phylum includes members that have, at some point during their development, a hollow dorsal nerve cord?
a. Hemichordata b. Arthropoda c. Cnidaria d. Chordata
Which of the following pathogenic characteristics would best allow Brucella organisms to produce a chronic infection in a host?
a. weakened inflammatory response b. resistance to complement c. resistance to antibiotics d. sequestering of organism within the endoplasmic reticulum
If two genes are homologous, then it can be said that they are
A. derived from different ancestral genes but have a similar function. B. derived from the same ancestral gene. C. found only outside the nucleus in the mitochondrion or chloroplast. D. derived from different ancestral genes and have different functions. E. related through environmental natural selection.