Answer:
There will be 2 molecules.
Explanation:
Each PCR cycle replicates one DNA molecule. This cycle lasts about 2 minutes where the Denaturation (where the DNA double helix is separated) phases occur, Bonding (where prmiets begin to establish complementary hydrogen bonds to the nitrogenous bases of the two DNA strands) and Synthesis (Where DNA polymerase begins to create new strands of DNA). Prior to the first round of PCR there was a DNA sample. However, after one cycle this sample was replicated, so the PCR reaction will follow with 2 DNA samples.
Answer: Nervous system.
Explanation:
Nervous system is the system found in animals that consist of all nerves and specialized cellscalled neurons and function in receiving and transmitting information to all part of the body.
Nervous system is divided into two:
Peripheral and Central nervous system.
The peripheral system consist mainly of nerves which connect Central nervous system to the other part of the body.
Nerves that transmit signals to the brain are called motor or effetent., While those that transmit signals from the body to the brain are called afferent nerves.
The Central nervous system consist of the brain and spinal cord.
Answer:
D) It held DNA
Explanation:
The nucleus controls and regulates the activities in a cell. It carries the genes or structures that contain the hereditary information. (DNA)
Answer:
Nutrient
Explanation:
Ecology can be defined as the scientific study of the relationship between living organisms such as plants and animals in relation to their physical and biological environment.
Nutrient inputs to the system come from weathering of rocks, from windblown dust, and from precipitation, which can carry material great distances. Various amount of nutrients are transported or transfered from terrestrial ecosystems through erosion and then deposited in aquatic ecosystems such as oceans, seas, and associated lowlands.
Erosion can be defined as a geological process which typically involves the wearing out of earthen (soil) materials and the transportation of these materials by natural forces like water, wind, etc. Soil erosion is greatest when the soil is steep.
Weathering can be defined as the physical and chemical breakdown of rock into smaller pieces called sediment. Weathering can be classified into two categories namely;
I. Physical weathering : it is the process of breaking rocks into pieces without affecting its chemical composition e.g temperature, abrasion and frost action.
II. Chemical weathering : it is the process of breaking rocks into pieces by chemical action which leads to changes in its chemical composition e.g carbonation, hydration, plant acid and oxidation.
