A vasectomy is a surgical procedure in which the vas deferens are severed, and then sealed with a laser. How would this cause sterility?
A. Sperm cannot be produced by meiosis.
B. Sperm cannot be produced by mitosis.
C. Sperm cannot move to the urethra.
D. A man cannot get an erection.
E. The testes stop producing testosterone.
C. Sperm cannot move to the urethra.
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After transcription and before translation, eukaryotic mRNA is modified by adding
A) tRNAs and amino acids. B) amino acids and a poly-A tail. C) a cap of modified nucleotides and a poly-A tail. D) an AUG at one end and a poly-U tail at the other.
The brain stem consists of the midbrain, the pons and the _________ oblongata.
Fill in the blank(s) with the appropriate word(s)
In a typical adult human about 180 L of fluid leaves the blood as filtrate each day. How much is reabsorbed?
a. about 50% b. about 65% c. about 90% d. more than 99%
Viruses with -ssRNA require the activity of (DNA polymerase/reverse transcriptase/RNA-dependent RNA polymerase) for their replication
What will be an ideal response?