Which of the following is false regarding
morphogens?
a. They are long-range signals in pattern formation.
b. They are encoded by master genes
c. They affect gene expression
d. Their concentration increases with distance from
source.
e. All of these are true.
Answer: c
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When a gamete that is lacking a sex chromosome due to nondisjunction has fused with a gamete carrying an X chromosome, this type of abnormality leads to the _________ .
A. Triple X syndrome B. Down Syndrome C. Edward Syndrome D. the Turner syndrome E. Klinefelter Syndrome
Which hormone is secreted by the adrenal cortex?
a. ADH b. renin c. angiotensin I d. angiotensin II e. aldosterone
Pure cultures cannot be isolated using the ______ method
a. roll tube b. streak plate c. most probable number d. agar dilution
The frustules in diatoms are composed of ________, which make(s) them difficult to degrade
a. chitin b. humics c. silica d. polysaccharides