A. An origin of replication and a selectable marker
B. A single restriction site only
C. A large size to hold more DNA
D. No antibiotic resistance genes
Answer: Option A
Solution (By JKSSB Mock Tests)
A plasmid used as a cloning vector in genetic engineering must have certain essential features: an Origin of Replication (ori) to ensure its replication within the host cell, a Selectable Marker (like an antibiotic resistance gene) to identify and eliminate non-transformants, and at least one unique Restriction Site (cloning site) for the insertion of the foreign DNA.
Explanation:
Heredity (inheritance) is the transmission of genetic information and traits from parents to offspring through genes. Variation refers to differences among individuals, evolution is the change in heritable traits over generations, and mutation is a change in DNA sequence. Mendel's laws describe the patterns of heredity. Genes are the units of heredity.
Explanation:
Guttation is the exudation of water droplets containing dissolved minerals from hydathodes at leaf margins, driven by root pressure when transpiration is low. Transpiration is vapor loss, bleeding is sap from cut tissue.
Explanation:
The appendix is considered vestigial (reduced and non-essential), but recent studies suggest it may have a minor immune function or serve as a reservoir for gut bacteria. So R is not entirely true (it may have a function). Thus, A is true but R is false (no function is an oversimplification).
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