Which of the following is(are) considered when selecting a germicidal chemical?
A.
Toxicity
B.
Cost
C.
Compatibility with the material being treated
D.
Environmental impact
E. All of the choices are correct.
E
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You are working in a Drosophila lab, and find a larva with two anterior ends. Both a normal larva and the mutant larva are shown below. What is the most likely explanation for the mutant larva phenotype?
A. There is a mutation in the bicoid gene causing no functional Bicoid protein to be made.
B. The nurse cells that produce the Bicoid protein are defective, so there is no protein at either end of the embryo.
C. There is a mutation in a homeotic gene.
D. There is a high concentration of the Bicoid protein at both ends of the mutant embryo.
E. A protein encoded by a segment polarity gene is not degraded correctly and accumulates in both ends of the embryo.
Which of the following statements concerning van der Waal interactions is FALSE:a
They are attractive forces. b. They are very strong. c. They involve transient regions of positive and negative charges. d. They form between nonpolar molecules. e. They operate over very short distances
Most chemical digestion occurs in the:a
stomach. b. ileum. c. jejunum. d. duodenum. e. colon.
After fertilization, a zygote develops into a fully formed human in about 38 weeks. During which stage of development do cells begin to differentiate and form specialized tissues and organs?
A) first trimester B) second trimester C) third trimester D) at birth