The diagram below shows the F factor and a portion of the E. coli chromosome that has three different insertion sequences (IS) of the same type as is carried on F.

                     

Describe the three different Hfrs (Hfr #1, Hfr #2 and Hfr #3) that can be formed by recombination between the IS on F and each of the IS sequences on the chromosome. Some including the positions of each of the markers (A, B, C, and D) and state which of these markers would be transferred early?

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#Question id: 425

#Unit 1. Molecules and their Interaction Relevant to Biology

Which is usually the slowest way to regulate a reaction in a metabolic pathway?

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#Question id: 12611

#Unit 10. Ecological Principles

Researchers in the Netherlands studied the effects of parental caregiving in European kestrels over 5 years. The researchers transferred chicks among nests to produce reduced broods (three or four chicks), normal broods (five or six),  and  enlarged  broods  (seven  or  eight).  They then measured the percentage of male and female parent birds that survived the following winter. (Both males and females provide care for chicks.) Brood Size Manipulations in the Kestrel: Effects on Offspring and Parent Survival

 

Which of the following is a conclusion that can be drawn from this graph?

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#Question id: 12319

#Unit 10. Ecological Principles

Fred and Joe, two unrelated, mature male gorillas, encounter one another. Fred is courting a female. Fred grunts as Joe comes near. As Joe continues to advance, Fred begins drumming (pounding his chest) and bares his teeth. Joe then rolls on the ground on his back, gets up, and quickly leaves. This behavioural pattern is repeated several times during the mating season. Choose the most specific behavior described by this example

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#Question id: 33515

#Unit 2. Cellular Organization

A. Mitochondrial genomes vary in total size by more than an order of magnitude. 

B. Animal cells have larger mitochondrial genomes. 

C. There are several hundred mitochondria per cell and each mitochondrion has multiple copies of the DNA. 

D. The total amount of mitochondrial DNA relative to nuclear DNA is small; it is estimated to be 10%.

Find correct order of true and false statements

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#Question id: 24287

#Unit 4. Cell Communication and Cell Signaling

What are the key components of desmosomes?

a. Claudin

b. Desmocollin

c. Occludin

d. Desmoglein

Choose the correct combinations.