Answer is Communicable disease can be spread by inanimate objects, such as doorknobs.
The causal organisms of some of the communicable diseases are bacteria and viruses. The communicable diseases such as common cough and cold can be transmitted to a healthy person by indirect contact with contaminated substances such as food, air, soil, feces, equipment, objects including doorknobs, remote controller, etc.
Sally inoculated 10 test tubes containing fresh minimal media supplemented with tryptophan with cells from this colony and grew the 10 cultures until the cells were dividing exponentially. She then plated 0.1 mL of each culture onto separate plates containing minimal media.
No colonies grew on 3 of the 10 plates. Colonies grew on the remaining seven plates, with one plate containing about 100 colonies and the other plates each containing between 1 and 15 colonies. What type of mutation allowed colonies to grow on these seven plates?
a) spontaneous forward mutation
b) spontaneous reverse mutation
c) induced forward mutation
d) induced reverse mutation
Answer:
b) spontaneous reverse mutation
Explanation:
Spontaneous mutations are produced by natural biological processes, while induced mutations are produced by mutagenic agents that trigger nucleotide errors in the DNA sequence. In the first phase of the experiment, Sally generated an induced mutation by using 5-bromouracil. The resulting strain required a constant supply of tryptophan to grow.
A reverse mutation restores the wild-type phenotype modified by a forward mutation, thereby reversing the phenotypic alteration to its original state. In a second step of the experiment, the colonies grew without the supply of tryptophan, thereby evidencing that the mutation was reversed in the original colony.
A. The waves spread out, and the frequency of
each line increases.
B. The waves spread out, and the frequency of
each line decreases.
C. The waves compress, and the frequency of
each line increases.
D. The waves compress, and the frequency of
each line decreases.
Answer:
A. The light waves squeeze together increasing wavelength
Explanation:
Answer:
c. Oxidative phosphorylation yields a lot of ATP
Explanation:
Fermentation is an anaerobic process that takes place in the anaerobic bacteria to produce an energy molecule called ATP. The process of fermentation involves the breakdown of the glucose through glycolysis which produces 2 ATP molecules, NADH and Pyruvate molecules.
The process does not undergo further steps like the Citric acid cycle and the oxidative phosphorylation which forms the high number of ATP molecules.Since the organism which performs the fermentation does not undergo oxidative phosphorylation therefore the yield of ATP in the cell is very less.
Thus, Option-C is correct.
or
macronutrients
Answer:
macronutrients
Explanation:
macronutrients are important for growing plants. the main macronutrients are nitrogen, Potassium, and phosphorus.
Answer:
The second answer.
Explanation:
Answer:
c the hatching of eggs by birds
Explanation:
it is using the same way as the heating
Answer:
The major differences between murine and epidemic typhus are their infection mode.
Explanation:
Typhus is a fever disorder that can be endemic or epidemic in nature. Both disorders are pathological and sociologically similar. Endemic typhus is also called as murine typhus.
murine typhus includes several symptoms such as high fever, rashes on the trunk of the body, nausea, diarrhea, and vomiting and infects by the flea feces contact to cut or open wound.
Epidemic typhus is a similar disorder but with more serious symptoms, including hypotension, bleeding into the skin, delirium, and death and spread by infected body lice.
Thus, the major differences between murine and epidemic typhus are their infection mode.