the penile urethra is enclosed by

What will be an ideal response?


the corpus spongiosum

Biology & Microbiology

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The trigger for a fixed action pattern is called the ____

Fill in the blank with the appropriate word.

Biology & Microbiology

________ 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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology