Which of the following is TRUE of the biological makeup and functioning of the penis in human males?
A. The human penis contains a bone which aids in erection.
B. The foreskin of the human penis is not retractable.
C. The flaccid state of a penis is known as tumescence.
D. The erection of a penis results purely from blood flow
D. The erection of a penis results purely from blood flow
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What cell is haploid?
A. oogonium B. zygote C. spermatogonium D. primary oocyte E. ovum
The two basic classes of cells are:
A) human and bacteria B) bacteria and eukaryotes C) unicellular and multicellular D) prokaryotes and eukaryotes E) plant and animal
Prions are composed of a single protein called (plaque/BSE/PrP).
Fill in the blank(s) with the appropriate word(s).
Gametophytes that are completely enclosed within the walls of a spore are known as
A. endospermic sporophytes. B. micropyles. C. heterosporic lycophytes. D. phragmoplasts. E. endosporic gametophytes.