TLS Online TPP Program

#Question id: 9596


The reaction centre chlorophyll is transiently in an oxidized state after losing an electron and before being re-reduced by its electron donor, what characteristics has been shown by chlorophylls in an oxidized state?

#Unit 6. System Physiology – Plant
  1. chlorophylls lose their characteristic low light absorbance in the red region of the spectrum; they become bleached
  2. chlorophylls lose their characteristic strong light absorbance in the red region of the spectrum; they become bleached
  3. chlorophylls lose their characteristic strong light absorbance in the far-red region of the spectrum; they become bleached
  4. chlorophylls lose their characteristic strong light absorbance in the far-red region of the spectrum; they become bleached
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TLS Online TPP Program

#Question id: 2807

#Unit 2. Cellular Organization

Huntington’s disease is an example of

a. an autosomal recessive disorder.    b. an autosomal dominant disorder.

c. a sex linked recessive disorder.      d. a sex linked dominant disorder.

TLS Online TPP Program

#Question id: 2808

#Unit 2. Cellular Organization

A microsatellite is a type of polymorphism that

a. results from the change of a single nucleotide.

b. changes the recognition sequence for a restriction enzyme.

c. results from a variable number of repetitive sequences.

d. results from a chromosomal inversion.

TLS Online TPP Program

#Question id: 2809

#Unit 2. Cellular Organization

In the human genome, one centimorgan or a 1 percent recombination frequency represents, on average, a distance of about

TLS Online TPP Program

#Question id: 2810

#Unit 2. Cellular Organization

Which of the following steps is required to generate a knockout mouse?

a. microinjection of DNA into the pronucleus of a fertilized mouse egg

b. introduction of DNA into mouse embryonic stem cells

c. selection for cells containing the gene targeted insertion

d. expression of Cre protein during embryonic development

TLS Online TPP Program

#Question id: 2811

#Unit 2. Cellular Organization

RNA interference is a method for inhibiting the function of specific genes using

a. single-stranded DNA.                     

b. double-stranded DNA.

c. single-stranded RNA.                     

d. double-stranded RNA.

TLS Online TPP Program

#Question id: 2812

#Unit 2. Cellular Organization

Which of the following statements is (are) true of the human genome?

a. 1.5 percent of the genome corresponds to protein coding sequences.

b. The median length of an intron is 10 kb.

c. 10 percent of the genome is transcribed into pre mRNA precursors.

d. Most human exons contain 500–1000 base pairs.