B) the enzyme lysozyme present in your tears degrades bacteria
C) white blood cells rush to the site of a wound to engulf bacteria
D) exposure to antigens lead to the production of antibodies that mark cells for destruction
Answer: The correct answer is B) the enzyme lysozyme present in your tears degrades bacteria.
Tears are the part of innate immunity, which is one of the two types of immune system ( innate and adaptive).
Innate immunity ( also called first line of defense) can be described as the generalized defense strategy of individual ( that is present from birth).
It includes certain physical and chemical barriers that are always ready to fight and clear pathogen.
For example- Lysozyme ( found in tears, saliva, mucus, and breast milk) degrade bacteria by breaking their cell wall and thus prevent infection.
Thus, option B) is the right answer.
Answer:
The polar nature of water make water universal solvent.
Explanation:
The polar nature of water is responsible for the versatility as a solvent because due to this polar nature of water maximum number of solutes or chemicals dissolved in it and it is also called universal solvent. Polar nature means making positive and negative polar which attracts the opposite charge atoms and making covalent bond with them. The hydrogen has partial positive charge so it attracts negative charge atom while oxygen has partial negative charge so it attracts positive charge atom.
Water's versatility as a solvent can be attributed to its polarity, hydrogen bonding, and high dielectric constant.
Water's versatility as a solvent can be attributed to several factors:
Polarity:
Water is a polar molecule, meaning it has a slightly positive end and a slightly negative end. This allows water to dissolve many different substances that have charged or polar molecules, like salts and sugars.
Hydrogen Bonding:
Water can form hydrogen bonds with other molecules. This allows it to dissolve substances that can form hydrogen bonds with water, such as alcohols and organic acids.
High Dielectric Constant:
The dielectric constant of water is relatively high, which means it can weaken intermolecular forces between solute particles and allow them to dissolve more easily.
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b. myofilament
c. sarcolemma
d. endomysium
Answer:
Sarcomere
Explanation:
Myofibril is the unit of the muscle cell. The myofibril is rod like in structure and developed by the process of myogenesis in embryo.
Sarcomere is the basic structural unit of the skeletal muscles and shows striations under the microscope. Sarcomere consists of thick and thin filaments of actin and myosin. Different bands like A- band , H-Band, I-Band and Z- line is visible in the sarcomere.
Thus, the correct answer is option (A).
Answer:
The population of each bacteria in 1, 2, 3 are 12, 8, and 7 respectively.
Explanation:
From the given information:
For food source A; we have:
3P₁ + P₂ + 2P₃ = 58 units of food A ---- (1)
For food source B; we have:
2P₁ + 4P₂ + 2P₃ = 70 units of food B ---- (2)
For food source C; we have:
P₁ + P₂ = 20 units of food C ----- (3)
From equation (1) and (2); we have:
3P₁ + P₂ + 2P₃ = 58
2P₁ + 4P₂ + 2P₃ = 70
By elimination method
3P₁ + P₂ + 2P₃ = 58
-
2P₁ + 4P₂ + 2P₃ = 70
P₁ - 3P₂ + 0 = - 12
P₁ = -12 + 3P₂ ---- (4)
Replace, the value of P₁ in (4) into equation (3)
P₁ + P₂ = 20
-12 + 3P₂ + P₂ = 20
4P₂ = 20 + 12
4P₂ = 32
P₂ = 32/4
P₂ = 8
From equation (3) again;
P₁ + P₂ = 20
P₁ + 8 = 20
P₁ = 20 - 8
P₁ = 12
To find P₃; replace the value of P₁ and P₂ into (1)
3P₁ + P₂ + 2P₃ = 58
3(12) + 8 + 2P₃ = 58
36 + 8 + 2P₃ = 58
2P₃ = 58 - 36 -8
2P₃ = 14
P₃ = 14/2
P₃ = 7
Thus, the population of each bacteria in 1, 2, 3 are 12, 8, and 7 respectively.
radioactive isotopes
special stains
high temperatures
Answer:
When viewing a specimen through a light microscope, scientists use special stains to distinguish the individual components of cells.
Explanation:
Microscope cell staining -
Microscope cell staining is a method that is used to for the better visualization of the cells and the parts of the cell , when are studied under microscope .
Stains are basically a type of biological tissues .
By the use of different type of stains , a nucleus of the cell or the cell wall of the cell are viewed easily , cells are sometimes stained in order to highlight metabolic process and can be used to find the difference between a dead or a live cell .
Some type of stains are specific for living cells , but some stains can work both for living as well as the non living cells .
Answer:
messenger RNA
Explanation:
Answer:
messenger RNA (mRNA)
Explanation:
mRNA is responsible for transcribing the bases of DNA into a blueprint for making proteins