Given the following mutants and conditions, predict the expression of the of the lacZ gene (no expression, basal level of expression, or activated level of expression). A mutant of E. coli that has a mutation in the operator of the lac operon that prevents the repressor from binding

Glucose	Lactose	Expression
+	-	1
+	+	2
-	-	3
-	+	4

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#Question id: 1290

#Unit 4. Cell Communication and Cell Signaling

Hydroxyproline is important in the formation of staple collagen polymers within cells. The formation of hydroxyproline requires:

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#Question id: 23564

#Unit 8. Inheritance Biology

Match the following

Column I	Column II
A) G-bands	i) viewing the chromosomes under ultraviolet light results from differences in the relative amounts of cytosine–guanine (C–G) and adenine–thymine base pairs
B) R-bands	ii) which are regions of DNA occupied by centromeric heterochromatin
C) Q-bands	iii) staining the telomere DNA  specifically
D) C-bands	iv) distinguish areas of DNA that are rich in adenine–thymine (A–T) base pairs
E) T-bands	v) reverting the dark bands by using saltingout method

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#Question id: 11551

#Unit 7. System Physiology – Animal

Polypeptides can have which of the following types of effects?

I) autocrine

II) paracrine

III) endocrine

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#Question id: 1392

#Unit 4. Cell Communication and Cell Signaling

In the nematode C. elegans, ced-9 prevents apoptosis in a normal cell in which of the following ways?

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#Question id: 11395

#Unit 9. Diversity of Life Forms

Mitochondria are thought to be the descendants of certain alpha -proteobacteria. They are, however, no longer able to lead independent lives because most

genes originally present on their chromosome have moved to the nuclear genome. Which phenomenon accounts for the movement of these genes?