Which description fits deuterostomes?
a. They undergo determinate cleavage, form a coelom by schizocoely, and develop a mouth near the blastopore.
b. They undergo indeterminate cleavage, form a coelom by schizocoely, and develop an anus near the blastopore.
c. They undergo indeterminate cleavage, form a coelom by enterocoely, and develop an anus near the blastopore.
d. They undergo determinate cleavage, form a coelom by enterocoely, and develop a mouth near the blastopore.
c. They undergo indeterminate cleavage, form a coelom by enterocoely, and develop an anus near the blastopore.
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Transcriptional control-proteins increase the rate of transcription by binding to
A. mRNA sequences within the DNA. B. tRNA sequences within the DNA. C. operator sequences within the DNA. D. promoter sequences within the DNA. E. enhancer sequences within the DNA.
Which of the following is not a reason that mycorrhizae are particularly useful for enhancing the phosphorus uptake of plants?
A. They can neutralize phosphoric acid. B. Their thin cells can access regions of soil that plants cannot. C. Movement of phosphorus through fungal cytoplasm is faster than its diffusion through soil water. D. They can release phosphorus that is bound to soils.
The nonselective movement of water and a number of solutes into excretory system tubules is called --____
a. reabsorption b. excretion c. filtration d. secretion e. diffusion
A vaccine protects by stimulating a person to produce a(n) ________ response when a pathogen is encountered.
A) primary immune B) secondary immune C) tertiary immune D) anaphylactic