Tightly coiled, rod-like structures of DNA and proteins are called
A. ribosomes.
B. chromosomes.
C. nucleoli.
D. chromatin.
Answer: B
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Ejaculation is a two-part reflex involving (1) contraction of the smooth muscle of the reproductive tract and accessory sex organs (emission), and (2) contraction of the skeletal muscles at the base of the penis (expulsion)
Indicate whether the statement is true or false
The onset of puberty is triggered by an increase in:
A. sensitivity of the gonads to pituitary gonadotropins. B. sensitivity of the pituitary to GnRH. C. GnRH secretion. D. sensitivity of the hypothalamus to negative feedback by sex steroids. E. sensitivity of the pituitary to negative feedback by sex steroids.
Each somite may differentiate into a
a) Sertoli cell b) Dermatome c) Ovary d) Myogenic cells e) Ductus deferens
Integrins
a. create a filamentous meshwork in the inner surface of the membrane b. act as membrane-bounded enzymes c. are used for cell recognition purposes d. span the membrane and link the plasma membrane and the cell's surrounding e. do not exhibit any of the above characteristics