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64-65: in a plant, axial flower (T) is dominant to terminal flower (t) and red fruit color (Y) is dominant to (y).

These effects are caused by two independently assorting autosomal gene


64. An individual terminal red plant was crossed with an individual axial yellow plant to produce offspring which were ½ axial red, ½ terminal red, the genotype of the crossed terminal red plant was

a)ttyy  b)ttYy c)ttYY d)Ttyy


65. In the cross described in q 64, the genotype of the crossed axial yellow parent was:

a)ttyy b)rrYy c)ttYY d)TTyy e)Ttyy


66-67: The ability of mutants 1,2,3 & 4 to grow on media containing growth supplememts A, B, C and D is summarized in the table below, in order to anserr the multiple choice qs, determine the biosynthethic pathway and which mutants affect which step

                       Growth response w/ supplement

Mutant               A    B    C  D

1                         0     0    +  0

2                         +     +    +  +

3                         +     +    +   0

4                         +    0    +   0


66. The order of the biosyntethic pathway from start to finish is:

a)ABCD b)DBAC c)BDCA d)CBAD


67. Mutant #1 inactivates the enzyme that catalyzes the BLANK enzymatic reaction

a)   First  b)second  c)third  d)fourth


19. Increased frequency of down syndrome is associated with:

a)   Inhereitance of one mutant gene

b)   Older maternal age

c)    Younger paternal age

d)   Increasing paternal age

20. Mass spectroscopy and 2-d gel electrophoresis are used to analyze:

a)proteins b)mRNAs c)DNA


21. Which of the following is true about RNA gene silencing?

a)it may decrease translation

b)it may result in degradation of mRNA

c)a double stranded RNA may form

d)all of the above are true


22. Transcriptosomes, that is all the transcripts in a cell are analyzed using:

a)   Fluorosecnetly labeled nuceleotides

b)   Microarrays

c)    PCR

d)   All of the above


23. Next generation roche 454 sequencing:

a)   Is slower than sanger dideoxy sequencing

b)   Uses biolumnsense to detect addition of a nucleosoide

c)    Uses capillary gel electrophoresis

d)   All of the above are true


24. Which of the following are true?

a)silencers are proteins that bind enhancer DNA sequences

b)enhancers are proteins that bind to activator DNA sequences

c)activators are proteins that bind to enhancer DNA sequences

d) a repressor is a DNA sequence, not a protein 

Top Answer

64.c) ttYY 65.e) Ttyy 66.b) DBAC 67.c)third 19.b) older maternal age 20.a)... View the full answer

biosynthetic pathway.jpg

Enzyme 1
Enzyme 2
Enzyme 3
Normal biosynthetic pathway
D
B
A
C
Mutant 1 has a mutation in a enzyme 3. So, it cannot
Enzyme 1
Enzyme 2
D
B
ErXime 3
convert A to C. Hence, it grows only in the...

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