What is the maximum number of electrons in the second energy shell of an atom?
A. 2
B. 8
C. 32
D. 4
E. 18
Answer: B
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Crossing over normally takes place during which of the following processes?
A) meiosis II B) meiosis I C) mitosis D) mitosis and meiosis II
Which subunit of RNA polymerase binds the consensus sequences in prokaryotic transcription?
a. ? b. ? c. ? d. ?’
Which phenotypes are parental?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) wild-type and orange
B) brown and bright-red
C) wild-type and brown
D) bright-red and orange
E) There is no way to determine this.
What is the pathogenic process underlying Rocky Mountain spotted fever?
A) cellular damage via potent exotoxins B) damage to blood vessels C) stimulation of a strong immune response D) interference with host cell metabolism E) formation of biofilms in host tissues