A gene that produces a protein that influences the expression of other genes is specifically called a(n)
a. activator.
b. structural gene.
c. repressor.
d. regulator gene.
e. constitutive gene.
Ans: d
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What is gross primary production?
A. The carbon fixed during photosynthesis. B. All of the carbon fixation after cellular respiration is accounted for. C. Energy released by both primary and secondary consumers. D. Photosynthetic production plus energy recycled through detritivores. E. None of the answers is correct.
The cells that produce hair made of protein contain a lot of ________, while the cells that produce the oils that coat the hair contain a lot of ________
A) smooth endoplasmic reticulum; lysosomes B) rough endoplasmic reticulum; smooth endoplasmic reticulum C) smooth endoplasmic reticulum; rough endoplasmic reticulum D) microbodies; lysosomes
Protozoa can survive changes in pH, nutrient availability or temperature as (conidospores /cysts/trophozoites).
Fill in the blank(s) with the appropriate word(s).
One application of the knowledge of sugar flow in xylem allows for the collecting of sap from maple trees in the
A. summer. B. fall. C. winter. D. early spring. E. None of these is correct.