#Question id: 4140
#Section 3: Genetics, Cellular and Molecular Biology
Which of the following statements about bacterial mRNA is true?
#Question id: 3525
#Section 3: Genetics, Cellular and Molecular Biology
In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype was crossed with rrtt plant results progeny, are
#Question id: 14202
#Section 5: Bioprocess Engineering and Process Biotechnology
In a fluidized-bed biofilm reactor, cells are attached on
spherical plastic particles to form biofilms of average thickness L = 0.5 mm.
The bed is used to remove carbon compounds from a waste-water stream. The feed
flow rate and concentration of total fermentable carbon compounds in the feed
are F = 2 l/h and S = 2000 mg/l. The diameter of the column is 10 cm. The
kinetic constants of the microbial population are rm = 50 mg S/cm3.
h and KS = 25 mg S/cm3 . The specific surface area of the
biofilm in the reactor is 2.5 cm2 /cm3 . Assuming
first-order reaction kinetics and an average effectiveness factor of n = 0.7
throughout the column, determine the required height of the column for effluent
total carbon concentration of S0i = 100 mg/l.
#Question id: 1986
#Section 2: General Biology
The following events occur when a mammalian immune system first encounters a pathogen. Which shows the correct sequence in which they occur?
I. Pathogen is destroyed.
II. Lymphocytes secrete antibodies.
III. Antigenic determinants from pathogen bind to antigen receptors on lymphocytes.
IV. Lymphocytes specific to antigenic determinants from pathogen become numerous.
V. Only memory cells remain.
#Question id: 1973
#Section 2: General Biology
Clonal selection is an explanation for how