Answer: Membrane proteins act as receptors to molecules like hormones.
Explanation:
Membrane proteins are proteins that are closely associated with a cell membrane. On the cell membrane, they could act as receptors to molecules like hormones that need to be transported across the hydrophobic lipid bilayer.
A good example of membrane proteins is sodium channel, that acts as receptor to neurotransmitters.
Answer:
b. the rotary flagella to change their rotation to allow the bacterium to change direction randomly
Explanation:
The bacterial flagella are made up of flagellin protein. The bacterial flagella is divided into three parts hook, filaments, and the basal body. Rotor is present in bacterial flagella which extends to the cytoplasm and makes C ring.
C ring contains several switch proteins that change the rotation of the flagella instantly in response to repellent or attractant which allows to change the direction of bacteria randomly. Bacterial Flagella can move clockwise and counterclockwise. Therefore the right answer is B.
Food and Drug Administration (FDA) of United States, has approved Truvada (tenofovir disoproxil fumarate), the first drug which reduce the risk of HIV infection in uninfected individuals who may engage in sexual activity with HIV-infected partners. They are at high risk of HIV infection. Truvada is taken daily as a pre-exposure prophylaxis measure, in combination with safer sex practices to reduce the risk of sexually-acquired HIV infection in adults at high risk.
The phosphate is removed by hydrolysis from ATP molecules. Thus, energy is stored in the chemical bonds of ATP and released during ATP hydrolysis.
Further Explanation:
Adenosine triphosphate (ATP) is the molecular currency used for energy transactions. The ATP energy is stored in the bonds between the terminal phosphate groups. These bonds are hydrolyzed by the enzymes to obtain energy for reactions. ATP is an energy caring molecule present in the living cell. It stores energy in the bonds between the phosphates produced by the breakdown of food molecules. It releases energy required for the chemical reaction, and hence, it is known as an effective energy donor.
ATP is made of three main structures:
The main energy source in ATP is phosphate tail. The energy is stored in the bonds present between the phosphates groups and release when these bonds are broke down. This process is referred to as ATP hydrolysis in this addition of water occurs. When the one phosphate is removed from ATP, then it is converted into ADP.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Membrane Biology
Keywords:
ATP, enzymes, bonds, chemical reaction, energy, phosphate group, ADP, food molecule, breakdown, donor, sugar, ribose.
A genetic factor exhibiting a trait even in the presence of alternative forms is described as a dominant allele. Dominant alleles express over recessive genes, as exhibited in the height trait of pea plants.
A genetic factor for a trait that is always expressed when present is referred to as a dominant allele. In genetic terms, alleles are variations of a gene. In a pair of alleles, one can be dominant and the other recessive. When an individual possesses both the dominant and the recessive allele, the trait associated with the dominant allele gets expressed. For example, for the gene concerning height in pea plants, the allele for tallness is dominant over the allele for shortness. Thus, when a plant inherits the tall and short alleles together, the tall trait is expressed due to the dominance of the tall allele.
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Cell Membrane
Endoplasmic Reticulum
cyptoplasm
ribosomes
Golgi complex
cytoskeleton