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

Biology & Microbiology

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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

Biology & Microbiology

Which subunit of RNA polymerase binds the consensus sequences in prokaryotic transcription?

a. ? b. ? c. ? d. ?’

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology