All of the following are true of mycorrhizae EXCEPT
A) they are fungi that form beneficial relationships with plants.
B) an example is the food delicacy truffles.
C) the vesicular-arbuscular mycorrhizae are a type of ectomycorrhizae.
D) they enable plants to absorb soil nutrients.
E) ectomycorrhizae extend the surface area of roots for nutrient absorption.
C
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Sponges are very interesting animals. Although they do not have true tissues, they have a number of cooperating cell types. How do these different cell types cooperate in obtaining nutrients for the sponge?
What will be an ideal response?
The animal shown in the illustration is a
a. urochordate. b. lancelet. c. sea squirt. d. tunicate. e. protostome.
Which of the following statements best describes RNAi techniques for gene silencing?
A) siRNAs block DNA replication. B) siRNAs inhibit transcription of a gene. C) siRNAs inhibit mRNA splicing. D) siRNAs trigger degradation of mRNAs to prevent their translation. E) siRNAs prevent transport of mRNA from the nucleus to the cytoplasm.
In the figure above, comparing the two competing hypotheses for the evolutionary relationships among mammalian groups:
a. the placentals and marsupials are sister groups under the Theria hypothesis, and the monotremes and marsupials are sister groups under the Marsupionta hypothesis. b. the monotremes and marsupials are sister groups under the Theria hypothesis, and the placentals and marsupials are sister groups under the Marsupionta hypothesis. c. the monotremes and marsupials do not form sister groups under either the Theria hypothesis or the Marsupionta hypothesis. d. the monotremes and marsupials form sister groups under both the Theria hypothesis and the Marsupionta hypothesis.