C4 plants have evolved different photosynthetic mechanisms. These plants _____.
a. are adapted to living in cold, wet climates where there is no water shortage
b. conserve water more efficiently by shutting their stomata during the day
c. fix CO2 into a four-carbon compound instead of a three-carbon compound
d. do not fix CO2 through the Calvin cycle
e. fix O2 instead of CO2
Answer: c. fix CO2 into a four-carbon compound instead of a three-carbon compound
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Axillary buds _____
A) are produced by the cork cambium B) have dormant meristematic cells C) are composed of a series of internodes lacking nodes D) give rise to secondary xylem E) do not form a vascular connection with the primary shoot
The primers in PCR are
a. fragments of mRNA. b designed to base pair with mRNA. c. free nucleotides. d. radioactive. e. none of these.
Which phylum is associated with all of these terms: asymmetry, choanocytes, filter feeding, osculum, and spicules?
a. Porifera b. Nematoda c. Ctenophora d. Nemertea
Is determined by the rate at which individuals are added to and subtracted from the population.
Fill in the blank with the corret word(s).