In corn, three dominant alleles, called A, C, and R, must be present to produce colored seeds. Genotype A/–; C/– ; R/– is colored; all others are colorless. A colored plant AaCCRr is crossed with colorless plant aaCcRr. What proportional of offspring plant with colorless seed?

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#Question id: 17081

#SCPH01 Biochemistry

What type of drug is Aminopterin and what it is used for

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#Question id: 1704

#SCPH05 I Biotechnology

The single best unique description of the interaction of the αβ T-cell receptor with peptide-MHC is that it:

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#Question id: 37

#I Life Science/ Life Sciences Group – I-V

Which one of the following has the cellular components arranged in order of their increasing size?

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#Question id: 15617

#SCPH06 I Botany

Wild type E. coli metabolizes the sugar lactose by expressing the enzyme ß-galactosidase. You have isolated a mutant that you call lac1–, which cannot synthesize ß-galactosidase and cannot grow on lactose (Lac–). During an condition you have a wild type (Lac+) strain carrying a Tn5 insertion known to be near several Lac genes on the E. coli chromosome. You grow P1 phage on this strain and use the resulting phage lysate to infect the lac1– strain, selecting for kanamycin resistance (Kanr). Among 100 Kanr transductants, you find that 82 are Lac– and 18 are Lac+. Express the distance between Tn5 and the lac1– mutation as a cotransduction frequency;

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#Question id: 15138

#SCPH01 Biochemistry

Match the items in group 1 with an appropriate description in group 2.

Group 1                                                                Group 2

(P) SWISS PROT                                 (1) derived protein structure database 

(Q) Local alignment                          (2) protein sequence database

(R) CATH                                             (3) GAP

(S) Global alignment                        (4) Smith–Waterman algorithm