Yeah yeah so :D,
Large polar molecules can only cross the membrane with the help of protein named channel protein and carrier protein.
So, this both proteins act like a gate, the large molecules enter the protein and the protein let the large molecules in to the membrane. (see the picture so that you can understand more, its carrier protein)
the only difference between channel protein and carrier protein is, channel proteins has fixed shape while carrier protein can flip.
Answer:
D/4
Explanation:
Hom-zygous recessive is both genes are recessive/tt
Hom-zygous dominate is both genes are dominate/TT
Heterozygous is 1 gene is dominate the other is recessive/Tt
Tissue engineering (TE) refers to the application of the principles of engineering to cell culture for the construction of functional anatomical units (tissue/organs).
The ultimate purpose of tissue engineering is to supply various body parts for the repair or replacement of damaged tissues or organs.
TE may be regarded as backbone of reconstructive surgery. It is possible to supply almost all surgical implants (skin, blood vessels, ligaments, heart valves, nerves) through the development of tissue engineering.
The correct answers are:
• Human bodies may contain pathogenic bacteria, but these are often kept in check by other (nonpathogenic) species.
• Human bodies contain bacteria that are beneficial to certain processes (for example, digestion).
Non-pathogenic species or normal flora are present in the different parts of human body such as oral mucosa, skin, seminal fluid, uterus, lungs, saliva.. Microbiota of normal flora are usually commensal (co-exist without harming effects on humans) whie some of them even have a mutualistic relationship with their human hosts (benefits for both) such as those hosted in the intestine.
