For sperm to be able to penetrate the zona pellucida of the egg, enzymes are released from the ________
Fill in the blank(s) with correct word
acrosome
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Which of the following is the best evidence that supercoiling is an intrinsic property of double-stranded DNA molecules?
A. Strand separation during transcription and replication introduces supercoiling. B. Purified plasmid DNAs are supercoiled even though all proteins are removed. C. When two strands of an entwined rubber band are pulled apart they will twist into supercoils. D. Linear fragments of double-stranded DNA are not supercoiled. E. None of these choices is correct.
Vaccinations against chicken pox provide individuals with __________ immunity
a. active natural b. active artificial c. passive natural d. passive artificial e. cell-mediated
Which of the following is characteristic of ciliates?
A) They use pseudopods as feeding structures. B) They are often multinucleate. C) They can exchange genetic material with other ciliates by the process of mitosis. D) Most live as solitary autotrophs in fresh water.
What mechanism of reproduction is most common in bacteria?
a. sexual reproduction: binary fission b. asexual reproduction: binary fission c. asexual reproduction: budding d. sexual reproduction: meiosis