Answer:
Due to less steps and requires less energy.
Explanation:
The bacterial cell is able to use glucose first as an energy source then switch to lactose because glucose requires less steps and less amount of energy for the break down as compared to lactose. If lactose is the only sugar available to the bacterial cells, then bacterial cells will use it as energy source for the production of energy. In order to use lactose, the bacteria must express the lac operon genes, which encode the main enzymes for lactose uptake and metabolism.
In humans, identical twins are possible because C. early blastomeres can form a complete embryo if isolated.
Identical twins are formed when an egg after fertilization by a sperm gets divided into two.
The early blastomeres are totipotent cells which means that they have the capability to form all the cells of the body further. Hence, if an egg after fertilization splits into two, it has the potential to form a complete embryo which forms an individual.
However, as the splitting process has occurred after fertilization, hence the two individuals formed will be identical twins. The genome for the identical embryos will be identical.
Identical twins are also referred to as monozygotic twins as they arise from a single egg or zygote.
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Option A. Increases and decreases of the heart rate result from changes in the activity of the <u>medulla oblongata</u>
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What is medulla oblongata ?
- Medulla oblongata, also called medulla, the lowest part of the brain and the lowest portion of the brainstem.
- The medulla oblongata is connected by the pons to the midbrain and is continuous posteriorly with the spinal cord, with which it merges at the opening (foramen magnum) at the base of the skull.
- The medulla oblongata plays a critical role in transmitting signals between the spinal cord and the higher parts of the brain and in controlling autonomic activities, such as heartbeat and respiration
- The medulla is divided into two main parts: the ventral medulla (the frontal portion) and the dorsal medulla (the rear portion; also known as the tegmentum).
- The ventral medulla contains a pair of triangular structures called pyramids, within which lie the pyramidal tracts.
- The pyramidal tracts are made up of the corticospinal tract (running from the cerebral cortex to the spinal cord) and the corticobulbar tract (running from the motor cortex of the frontal lobe to the cranial nerves in the brainstem)
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Answer:
1) Gene expression can be modified by Interactions with the environment
Explanation:
Environment factors such as temperature change for instance affects the expression of the genes for a particular trait and these genes can be modified too.
Answer:
Explanation:
Only archaebacteria are capable of methanogenesis
Archaebacteria who use other forms of cellular respiration also exist, but methane-producing cells are not found in Bacteria or Eukarya.
Unique cell membrane chemistry. Archaebacteria have cell membranes made of ether-linked phospholipids,
