Sperm-producing cells are referred to as
a. spermatocytes.
b. Sertoli cells.
c. interstitial cells.
d. seminiferous cells.
e. spermatogenic cells.
E
You might also like to view...
Which of the following is a unique, derived trait that is present in all birds?
a. ability to fly b. four-chambered heart c. feathers d. lack of a urinary bladder e. migration
The gametophyte generation of ferns is called the:a
prothallus. b. protonema. c. gemma. d. thallus. e. fiddlehead.
Fungi usually obtain food by
A) producing antibiotics that internally destroy bacteria. B) absorbing it and then digesting it within fungal cells. C) chemosynthesis. D) digesting it externally and then absorbing it. E) photosynthesis.
Why don't the grafted hybrids produce apples with a blend of traits from the scion and the rootstock?
A) The rootstock suppresses activation of the scion genes, which alters fruit production. B) The rootstock is unable to perform photosynthesis and so can't produce fruit. C) Transplanted nuclei from scion cells regulate gene expression in the rootstock. D) The rootstock regulates gene expression in the scion but contributes no genetic information for fruit production.