At what stage does a developing sperm cell begin to grow a tail?
A. Primary spermatocyte
B. Spermatozoon
C. Spermatogonium
D. Spermatid
E. Secondary spermatocyte
Answer: D
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For intramembranous ossification to take place, which of the following is necessary?
A) closing of the epiphyseal plate B) long bones reaching adult length and width C) appositional growth D) concentric growth
The nucleus of every human cell contains how many chromosomes??
A) ?23 B) ?46 C) ?69 D) ?92
Which type of RNA has three nitrogen bases at one end that are known collectively as an anticodon?
a. ribosomal b. messenger c. lysosomal d. transfer
The three types of cones in the retina are differentiated from one another by what feature?
A. Whether they contain cis-retinal or trans-retinal or both B. The absorption peak of their photopsin C. The number of discs in their outer segment D. The width of their outer segment