In the prenatal diagnostic technique amniocentesis,
A) a needle is inserted into the umbilical cord to collect fetal blood for screening.
B) a thin, flexible tube connected to a needle is inserted through the vagina and into the uterus to collect a tissue sample.
C) fetal blood is collected directly from the chorionic villi near the cervix.
D) a needle is inserted through the abdominal wall to collect amniotic fluid containing fetal cells.
E) the procedure cannot be performed after the fifteenth week of gestation.
D
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An organism with a temperature growth optimum near 80°C and a pH growth optimum between two and three is usually referred to as a(n) ________.
A. thermophile B. halophile C. thermoalkalophile D. thermoacidophile
Which of the following antigen types found in gram-negative enterics is mismatched?
A. K antigen - capsule B. O antigen - cell wall C. H antigen - flagellar D. All of the choices are correct matches.
In some bacteria, a capsule surrounds the cell wall. It is made up of
A. pili. B. glycoprotein. C. gelatin. D. peptidoglycan. E. a lipopolysaccharide.
Levels of ecological organization
What will be an ideal response?