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TLS Online TPP Program

#Question id: 13020

Experts in deer ecology generally agree that population sizes of deer that live in temperate climates are limited by winter snow. The deer congregate in ?yarding? areas under evergreen trees because venturing out to feed in winter is energetically too expensive when snowfall depths accumulate to above 40 cm. Deer often stay yarded until the spring thaw. Snow depth over 40 inches for more than 60 days results in high mortality due to starvation. This observation best illustrates which of the following principles about factors that limit distribution of organisms?

#Unit 10. Ecological Principles

Abiotic factors, such as weather extremes, ultimately limit distribution.
Organisms will face extinction unless they adapt to conditions or evolve new mechanisms for survival.
Environmental factors are limiting not only in amount but also in longevity.
Daily accumulations in snow depth gradually add up to cause increased deer mortality

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TLS Online TPP Program

#Question id: 33898

#Unit 2. Cellular Organization

E. coli cell has 4,639,675 bp have a contour length of about 1.7 mm and E. coli cell is 1µm is length. What can be correctly inferred from this data.

TLS Online TPP Program

#Question id: 33899

#Unit 2. Cellular Organization

A. In E.coli, a natural closed DNA that is negatively supercoiled.

B. The intercalation of ethidium bromide first removes the negative supercoils and then introduces positive supercoils.

TLS Online TPP Program

#Question id: 33900

#Unit 2. Cellular Organization

A. Bacterial genome have many independent chromosomal domains

B. Bacterial genome is circular and have many intertangled domains

C. Each domain consists of 40 kilobases (k2. of DNA

D. The existence of separate domains donot permit different degrees of supercoiling to be maintained in different regions of the genome.

Find true and false

TLS Online TPP Program

#Question id: 33904

#Unit 2. Cellular Organization

A. The bacterial nucleoid is 80% DNA by mass.

B. Bacteria have similar morphological features as of eukaryotic chromosomes,

C. Bacterial genomes are organized into definite substructures within the cell.

D. Bacterial Protein HU is a dimer that condenses DNA, possibly wrapping it into a beadlike structure.

Find true and false

TLS Online TPP Program

#Question id: 33905

#Unit 2. Cellular Organization

E. coli DNA in vivo corresponds to an average density of 1 negative superhelical turn/200 bp it means it has

TLS Online TPP Program

#Question id: 33906

#Unit 2. Cellular Organization

Which is correct combination of statements

A. Bacterial genome has independent sets of domains and each domain consists of a loop of DNA.

B. Presence of domain in genome can be analyzed by EtBR intercalation and DNase treatment

C. Early data suggested that each domain consists of 10kb-40 kb of DNA