What type of plant would be least affected by the loss of the guard cell function that closes stomata?
A. a carnivorous plant
B. a desert plant
C. a rainforest plant
D. a plant from the plains of the American midwest
E. a poisonous plant
Answer: C
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In female humans and other mammals, dosage compensation is achieved by the inactivation of one of the two X chromosomes in each cell. Which one of the following does not occur in the X-inactivation mechanism of female mammals?
A. X-inactivation begins with a small region of the X chromosome that contains a gene for an X-inactivation specific transcript (Xist). B. Xist is expressed in low levels except when an X chromosome is about to be inactivated. C. When an X chromosome is about to be inactivated, Xist RNA transcripts increase markedly and undergo splicing, but do not encode a protein. D. Xist RNA is attracted to and associates with a protein called the X-chromosome inactivation center (XIC), which becomes entirely coated with Xist. E. Xist RNA recruits factors that promote DNA methylation, histone modification, and other changes associated with transcriptional silencing.
Similar body parts are not always homologous
They may have evolved independently in separate lineages as adaptations to the same a. reproductive isolation of these groups. b. environmental pressures. c. reduced genetic variability in these groups. d. identical genes in all three groups. e. factor as all of these.
The ingestion of fecal material for further extraction of nutrients is referred to as
A) nectarivory. B) coprophagy. C) folivory. D) autophagy.
You discover a unicellular organism that moves by what appear to be pseudopodia. You conclude that this organism is ________
A) either a type of amoeba or a type of slime mold B) a type of bacterium C) a type of alga D) either a type of ciliate or a type of apicomplexan