All of the following statements are true regarding fetal ultrasound, EXCEPT
A. 3D ultrasounds provide a computer-constructed model of the entire fetus.
B. Fetal ultrasounds are contraindicated in male patients due to possible damage to external genitalia.
C. Fetal ultrasounds are helpful in the prenatal diagnosis of birth defects.
D. Intestinal coils within the umbilicus are normal between weeks 10 and 15.
E. Proportionally, the fetus' head:body ratio will be more adult-like the later the ultrasound is done.
Answer: D. Intestinal coils within the umbilicus are normal between weeks 10 and 15.
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Living organisms increase in complexity as they grow, resulting in a decrease in the entropy of an organism. How does this relate to the second law of thermodynamics?
A) Living organisms do not obey the second law of thermodynamics, which states that entropy must increase with time. B) Life obeys the second law of thermodynamics because the decrease in entropy as the organism grows is exactly balanced by an increase in the entropy of the universe. C) Living organisms do not follow the laws of thermodynamics. D) As a consequence of growing, organisms cause a greater increase in entropy in their environment than the decrease in entropy associated with their growth. E) Living organisms are able to transform energy into entropy.
Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for 1 generation. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy band. B. one light band. C. one half-heavy (intermediate to heavy and light) band. D. one heavy and one half-heavy band. E. one heavy and one light band.
The charge of a water molecule is considered:
a. polar. b. positive. c. negative. d. neutral. e. nonpolar.
In general, which statement is true of multimeric antibodies?
a. They have high cross reactivity. b. They have higher affinity but low avidity. c. They have lower affinity but high avidity. d. They have low cross reactivity.