All Free Biology MCQs with Answers

• A. Cytokinin
• B. Make the plants less productive
• C. Develop into mature plants
• D. Mature flower

Explanation: A mature plant develops from each somatic embryo

• A. Quinine
• B. Direct way to produce plants
• C. Produce proembryos
• D. Releasing haploid embryos

Explanation: The haploid tube cells with in the pollen grains divide, producing proembryos consisting of as many as 20 to 40 cells. Finally the pollen grains rupture releasing haploid embryos. The experimenter can now generate a haploid plant, or chemical agent can be added that encourages chromosomal doubling.

• A. Releasing haploid embryos
• B. Produce proembryos
• C. Asprine
• D. Quinine

Explanation: The haploid tube cells with in the pollen grains divide, producing proembryos consisting of as many as 20 to 40 cells. Finally the pollen grains rupture releasing haploid embryos. The experimenter can now generate a haploid plant, or chemical agent can be added that encourages chromosomal doubling.

• A. Direct way to produce plants
• B. Releasing haploid embryos
• C. Produce proembryos
• D. Quinine

Explanation: Tissue culture is the growth of a tissue in an artificial liquid culture medium.

• A. Production of cosmetics
• B. Crossing of different varieties of plants
• C. Corn and wheat protoplasts
• D. Galactosidase

Explanation: Scientists envision that it will be possible to maintain cell suspension cultures in bioreactors for the purpose of producing chemicals used in the production of drugs, cosmetics and agricultural chemicals.

• A. Corn and wheat protoplasts
• B. Galactosidase
• C. Inserted in tobacco protoplast
• D. Crossing of different varieties of plants

Explanation: Traditionally, hybridization, the crossing of different varieties of plants or even species, was used to produce plants with desirable traits.

• A. Inserted in tobacco protoplast
• B. Galactosidase
• C. Crossing of different varieties of plants
• D. Production of cosmetics

Explanation: Firely enzyme luciferase was inserted into tobacco protoplast and the adult plants glowed when sprayed with the substrate luciferin .

• A. Corn and wheat protoplasts
• B. Crossing of different varieties of plants
• C. Galactosidase
• D. Production of cosmetics

Explanation: Corn and wheat protoplasts produce infertile plants.

• A. Bone marrow transplant
• B. Retrovirus
• C. DNA Fingerprinting
• D. Somatic cells

Explanation: DNA Fingerprinting has nothing to do with gene therapy. Bone marrow transplants, retroviruses, and somatic cells are used to treat patients with mutations in genes. Bone marrow transplant replaces the stem cells in the bone marrow. Retroviruses are used to administer a gene into the cell so that it is incorporated into the DNA. Somatic cell gene therapy involves the placement of a human gene into a living person's somatic cells.

• A. DNA cloning
• B. DNA analysis
• C. DNA sequencing
• D. DNA splicing

Explanation: DNA fingerprinting is a laboratory technique used to establish a link between biological evidence and a suspect in a criminal investigation. A DNA sample taken from a crime scene is compared and analyzed with a DNA sample from a suspect. If the two DNA profiles are a match, then the evidence came from that suspect.