#Question id: 5256
#Section 3: Genetics, Cellular and Molecular Biology
If the experimental population of E. coli lacks an F factor or F plasmid, and if bacteriophage are excluded from the bacterial cultures, then which of these is a means by which beneficial mutations might be transmitted horizontally to other E. coli cells?
#Question id: 1629
#Section 2: General Biology
Clonal selection occurs when antigen is encountered by:
#Question id: 15556
#Section 1: Engineering Mathematics
The value of the determinant
#Question id: 10186
#Section 2: General Biology
#Question id: 10522
#Section 6: Plant, Animal and Microbial Biotechnology
Mechanical barriers
provide a first line of defence against insect pests and pathogens, these
mechanical barriers developed by plants;
|
COLUMN A |
COLUMN B |
|
A. Thorns |
i) It can be found on the stem and petioles of
roses and are formed by the epidermis |
|
B. Spines |
ii) Found on a lemon tree (Citrus sp.) are
modified branches, as can be seen by their position in the axil of a leaf |
|
C. Prickles |
iii) Found on shoot and leaves of tomato (Solanum
lycopersicum) are derived from epidermal cells |
|
D. Trichomes |
iv) which are characteristic of cacti (Opuntia
spp.) in the New World, are modified leaves |
Match correctly following combination of barrier developed by plants ;