A surgical puncture to obtain a specimen of amniotic fluid is known as

Which of these contraceptive methods on its own is least likely to prevent pregnancy ? a. spermicides b. condoms c. surgical sterilization d. oral contraceptives

Which of the following statements concerning cancer and mutations is correct? a: cancer can only occur with a mutation in a somatic cell. b: usually, multiple mutations are required in different genes to cause cancer. c: none of the other answer options is correct. d: cancer can only occur with a mutation in a germ cell. e: usually, a single mutation is all that is required to cause cancer.

Disinfection of countertops, metal, and hard plastics is not best accomplished by the use of because it's very corrosive to hard surfaces. a. alcohol b. a glutaraldehyde solution c. an ultrasonic cleaner d. a phenol compound