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The mutation rates due to replication error in strains A and B of Escherichia coli are 10-8 and 10-9 per genome per generation respectively. Starting from 10 cells of each […]

You unearth a fossilised skull. Your initial investigation suggests a reptile, likely a dinosaur, that had strong jaw muscles. What feature led to you that conclusion? The presence of a […]

A newly discovered extra-terrestrial organism was found to contain proteins that are made up of 75 different amino acids. Assuming that one codon codes for a unique amino acid, which […]

A trihybrid test cross (order of loci unknown) produced progeny classes as follows: 35 AbC/abc, 37 aBc/abc, 8 ABc/abc, 10 abC/abc, 3 ABC/abc, 5 abc/ abc, 1 Abc/abc, 1 aBC/abc. […]

Which of the following statement is correct, given this phylogeny of four species? A has gone extinct A is more closely related to C than D D evolved from C […]

X-linked recessive disorders are most commonly exhibited by —- because——- females, because they have two X-chromosomes and are therefore more likely to inherit one with a disease males, because they […]

The stages of the cell cycle for a cultured mammalian cell line require the following periods of time: G1 = 8 hr, S = 5 hr, G2 = 1 hr, […]

Which of the following statements explains why net primary productivity is higher near the tropics? More predators in the tropics kill herbivores, increasing plant growth in the tropics Increased species […]

Human DNA contains 18% C on a molar basis. What is the mole percentage of A, G, and T respectively? 32, 18, 32 18, 32, 32 32, 32, 18 Insufficient […]

You synthesise a short peptide [AMxVFxGNxM], where x is any amino acid with a charged side chain. How many possible peptides can be synthesised? 15 243 125 27 How Many […]