A group of college students working on a project on bio-gas have found some bacteria in the bio-gas plant. These bacteria can utilize methane as their source of energy and do not need oxygen for their survival. What kind of bacteria could they be?A- Archaebacteria
B- Eubacteria
C- Probacteria

Answers

Answer 1

Answer: The answer is (a.) Archaebacteria

Archaebacteria or Archaea are prokaryotes. They have no cell nucleus. They don't even have membrane-bound organelles in the cells. These bacteria can utilize methane as their source of energy but oxygen is not vital for their survival.

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Biologists once assumed that the phenotype of a dominant allele would always be the most common phenotype in a population. Which finding led biologists to a different conclusion?
What are antibiotics and ribosomes?
Which abiotic factor is most likely in a desert?a. a primary consumer b. wind c. a top predator d. a snake
Use the drop-down menus to complete the statements. A vertical column of elements in the periodic table is called a ____ . A horizontal row of elements in the periodic table is called a ____ . Atoms of elements in the same group have the same ____ . As you move from left to right on the periodic table, the atomic number ____ .

Which statement accurately describes how identification of individuals through the use of genetic engineering is possible? A. The DNA in mitochondria is passed from mother to child in the nucleus of a cell.
B. The Y chromosome doesn't experience crossing-over.
C. The mitochondria DNA in a mother and her offspring vary greatly.
D. The X chromosome can only be passed from a father to his son.

Answers

The identification of an individual by the means of genetic engineering is possible because the Y chromosomes in the males does not experience any crossing-over as there is only a single Y chromosome present in a human male.

The mitochondrial DNA is passed from the mother to child in the cytoplasm of the cell, and it is passed on without any changes. The X chromosome is can be passed from a mother to her son as he will receive Y chromosome from his father.

Hence, the correct answer is 'Option B - The Y chromosome does not experience crossing over'.

A. The DNA in mitochondria is passed from mother to child in the nucleus of a cell.

A benefit of genetic engineering is the production of valuable proteins that have helped in managing of illness in human beings. Bacteria were genetically engineered to produce proteins of medical importance. One example of such a protein is human insulin which is given the name humulin and is made using E. coli bacteria.Earlier, insulin from pig cells was used to treat patients with diabetes but many of them could not tolerate it because it has a slightly different arrangement of amino acids from that of humans and so the human body rejects it. Humulin is tolerated by the human body and so many patients are now using it to lead normal lives.

Which class of organisms gather their energy directly from the sun? a. autotrophs b. carnivores c. herbivores d. detritivores

Answers

Answer:

The correct answer would be a. autotrophs.

Autotrophs, also called producers are the organisms which are able to produce complex organic compounds such as fats, proteins and carbohydrates from simpler substances present in the environment.

They are of two types based on their source of energy:

Photoautotrophs: These are the organisms which use sunlight as the source of energy in order to produce organic compounds.

For example, green plants synthesize their own food (glucose) from carbon dioxide with the help of sunlight and chlorophyll. Oxygen is released as the byproduct. The overall process is termed as photosynthesis (photo meaning photon or light energy).

Chemoautotrophs: They get energy from electron donor compounds such as sulfur, hydrogen sulfide et cetera.

The answer A. autotrophs

Over many generations man has chosen certain desirable characteristics in dogs by allowing dogs possessing those characteristics to reproduce. In this way, 150 breeds of dogs, same species, have descended from wolves. This process is referred to asA. convergent evolution
B. artificial selection
C. inheritance of acquired traits
D. natural selection

Answers

Artificial Selection

Explanation:

Artificial selection is also called as Selective breeding where humans identify desirable traits or characteristics in animals and plants, and the action taken to promote those characteristics or traits in future generation.

Example of Selective breeding or Artificial Selection is Dog Breeding.

Artifical selection carried out in Animals and Plants have many side effects such as diseases, health disorders and obesity. It may also cause the reduction in size of the brain.

What happens when there is an error with the cell cycle?

Answers

During the cell cycle there are three check points to make sure there is no errors. But if there is still an error after the cell cycle the cell would grow abnormally and will become cancer.

Why did Gregor Mendel choose to use purebred plants in his experiments?

Answers

Gregor Mendel is a Central European Monk who studied genetics through plants. He is greatly known as the founder of modern science genetics. In his various experiments, Mendel cross-pollinated pea plants because the peas have characteristics that have two forms. This means that pea plants have both male and female reproductive systems. They have the capacity to self-pollinate or cross-pollinate with other plants and as a result, Mendel discovered the nature of genetic inheritance.

At that time, Mendel debunked the famous “blending theory” commonly believed by scientists. This is a theory in biology where scientists believed that through time traits of organisms blend from generation to generation to create new organisms.

A breeder wanted to create a new variety of potatoes that produces more of the vitamins found in the roots of carrots than in typical potatoes. This method of selective breeding would be most likely used by the breeder.a. inbreeding
b. hybridization
c. hand pollination
d. genetic engineering