Answer: The amoeba uses pseudopods, which it creates by deforming its body and streaming its cytoplasm. The euglena whips a flagellum to move. The only similarity between the amoeba and euglena in that the euglena can deform its body in an almost earthworm-type motion. This is something like the amoeba's motion and is used to supplement the euglena's flagellum when it wants to move quickly.
Answer:
Some insects with Bt resistance genes are able to survive in the presence of Bt toxin. Natural selection favors these insects and increases their proportion in future generations.
Explanation:
Some of the insects in the insect population have one or more genes that impart Bt resistance to them. These insects are able to survive in the presence of Bt toxin while the ones that lack these genes simply die by Bt toxin. Natural selection allows these insects to leave more progeny in the future generation which in turn results in increased frequency of the Bt resistance gene in the future populations. This results in the spread of Bt resistance among insect populations.
The correct answer is option (C) transposons or jumping genes.
Barbara McClintock was an american cytogeneticist. In 1940s, she discovered the phenomenon of transposition brought about by the mobile genetic elements or jumping genes or the transposable elements. These jumping genes refers to a sequence of DNA which can change its position in the genome or the genetic constitution of an organism. She discovered these jumping genes in the Maize for the first time and received the nobel prize in 1983.
Jumping genes form a major portion of the eukaryotic genome. They are often responsible for mutations and associated with the duplication of the genetic material. They also cause the structural changes in the chromosomes like inversion, deletion and translocation which are called the chromosomal aberrations.
The question does not has options.
Meiosis is a type of cell division that takes place in gonads where the chromosome numbers are reduced to half. The sequence of events taking place in meiosis are as follows:
1. Meiosis I-It includes
Prophase I
Metaphase I
Anaphase I
Telophase I
Cytokinesis
2. Meiosis II- It includes
Prophase II
Metaphase II
Anaphase II
Telophase II
Cytokinesis
Lipolysis increases when the following hormone is released (1) cortisol.
Lipolysis is the process of breakdown of lipids triglycerides. In this process, the triacylglycerols breakdown by the phenomenon of hydrolysis into their monomeric units glycerol and free fatty acids. The process can happen in all cell types, but the white and brown adipose tissues are more prominent for lipolysis.
Cortisol is a hormone also known as the stress hormone. It is steroidal in nature. The adrenal glands are responsible for the secretion of these hormones. It elevates the blood pressure of the body and also enhances the energy levels.
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