Integrins are unusual in that they:a
are steroids.
b. are specific transmembrane proteins.
c. respond to information received from inside and outside the cell.
d. stimulate both the Ras pathway as well as the IP3 pathway.
e. are found only in Arabidopsis thaliana.
C
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The seeds of many plant species are dispersed by a harmless temporary attachment to an animal's fur or feathers. This form of dispersal is known as
A. ectoparasitism. B. amensalism. C. mutualism. D. phoresy. E. trophic mutualism.
In general, litter with a C/N ratio greater than 30 leads to immobilization, litter with a C/N ratio less than 20 leads to mineralization, and litter with a C/N ratio of 20-30 leads to a balance of immobilization and mineralization resulting in no
net N production. If garlic mustard leaf litter collected on the forest floor had 43.2 percent C and 1.16 percent N, this tissue would lead to A) immobilization. B) mineralization. C) a balance of immobilization and mineralization. D) preferential consumption.
Although the most frequent forms of Down syndrome are caused by a random error, nondisjunction of chromosome 21, Down syndrome occasionally runs in families. The cause of this form of familial Down syndrome is ________
A) an inversion involving chromosome 21 B) too many X chromosomes C) a chromosomal aberration involving chromosome 1 D) a translocation between chromosome 21 and a member of the D chromosome group E) a maternal age effect
Which of the following regulates genes by binding directly to transcription factor proteins?
a. Growth hormone b. Insulin c. Steroid hormones d. Epinephrine