the penile urethra is enclosed by
What will be an ideal response?
the corpus spongiosum
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The trigger for a fixed action pattern is called the ____
Fill in the blank with the appropriate word.
________ consist of proteins and RNAs that associate, providing both a physical support and enzyme activity for protein synthesis.
A) Nucleosomes B) Ribosomes C) Nuclei D) Histones
Four of the five features listed below are found in
sponges. Select the exception. a. mesoglea b. spicule c. gemmule d. flagellated collar cells e. amoeboid cells
The vertebrate kidney helps to keep the acidity of body fluids constant by varying the amount of hydrogen ions (H+) it secretes into the urine. You can confidently predict that this aspect of kidney function will be controlled by
A) a positive feedback mechanism. B) a negative feedback mechanism. C) nerve impulses from the brain. D) a hormone produced in the kidney itself.