Answer:
They have shown in numerous studies that enzyme output gradually decreases with age and may be reduced by more than 60% by the time we reach age 55. At some point in time, we must supplement our enzyme reserves in order to fight the degenerative conditions associated with aging.
Explanation:
B. Removes waste from the body
C. Attaches to bones helps the body move
D. The nervous system gathers and interprets information and sends messages throughout the body.
Answer:
A
Explanation:
please give brainlest
b. a river contaminated with the Giardia protozoan
c. a doorknob contaminated with the cold virus
d. an asymptomatic person infected with HIV
e. a mosquito infected with the malaria protozoan
Answer:
The correct option is: c. a doorknob contaminated with the cold virus
Explanation:
Fomites are the inanimate objects or substances that can get contaminated with the pathogens and are capable of transferring the pathogens to the new hosts.
Sterilization of the possible fomites should be done in order to prevent cross-infection.
Examples of fomites are hair, towels, clothes, door knobs, cups, switches, handrails, remote controls, pens, syringes, bedding, etc.
B) allowing runoff of irrigation water
C) throwing out old motor oil instead of recycling it
D) painting boats in or over the water instead of in dry docks
Test Tube 6 - Sugar (Sucrose) and Heated Lactase Enzyme: Demetri fills the sixth test tube one-quarter full of sugar. He then adds the heated lactase-and-water solution until the test tube is three-quarters full. He thoroughly mixes the solution and inserts the test strip for 30 seconds. Demetri then records the color of the test strip.
According to the test strips, which of these sugar solutions contained glucose?
None of the sugar solutions contained glucose, and when the glucose strips were put in the sugar, they did not change color.
A test strip is a strip made up of cloth or different types of paper. The strips are used in chemical and biological tests, they turn or change their color, and identify the substance.
Here, the test strip will not show any color, because glucose is not present in any of the solutions as mentioned.
Thus, the glucose strips did not change color when placed in the sugar, and none of the sugar solutions contained glucose.
Learn more about test strip, here:
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Answer:
A heterogeneous mixture of water, carbon dioxide, oxygen, glucose molecules
At a molecular level, looking at a tree involves observing atoms and molecules that combine to form more complex structures such as cells, tissues, and organs. These microscopic structures support the tree's growth, function, and ability to adapt to its environment. Thus, a tree represents various levels of biological organization.
Molecularly speaking, when you look at a tree you're witnessing an array of complex structures that form the basis for life. This includes atoms, the smallest and most fundamental units of matter that form molecules. Many biologically important molecules in the tree are macromolecules, large molecules formed by polymerization where smaller units called monomers combine. These molecules are significant components of the tree's cells which are the fundamental building units of life.
Additionally, what you're also seeing are elements of the tree's structure including tissues and organs that are formed by these cells. For instance, the tree's leaves contain specialized cells like guard cells which help regulate gas exchange. On a larger scale, these molecules and cells also contribute to the overall health, function, and resilience of the tree in its ecosystem.
Therefore, when you look at a tree, you're essentially witnessing numerous levels of biological organization. These range from the level of molecules and cells up through tissues and organs, to the entire tree or organism itself. This allows the tree to grow, function, and adapt to its environment.
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The correct answer is option B, that is, crossing over.
Crossing over or chromosomal crossover refers to the interchange of genetic substance between the two homologous chromosomes non-sister chromatids, which leads to the formation of recombinant chromosomes at the time of sexual reproduction.
It takes place in the pachytene stage of prophase I of meiosis at the time of a procedure known as synapsis.