The correct answers are: The lipid bilayer and proteins exist side by side without covalent bonds between them and Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane
According to fluid mosaic model, there is a lipid bilayer that gives fluidity and in which the protein molecules are embedded.
The membrane is mosaic because there is a pattern of different types of molecules that are put together. Molecules are constantly moving in two dimensions.
Components of the cell membrane include:
• Phospholipids – Form a bilayer
• Cholesterol –improves stability and reduce fluidity
• Proteins –integral (transmembrane) or peripheral
• Sugars-usually attached to proteins.
Answer:
Explanation:
As water temperature increases, the amount of O2 dissolved in water decreases.
The graph looks something like this (though not exactly. It just has the same sort of shape.)
Answer:
Destroyed environments can recover through ecological succession.
Explanation:
Ecological succession describes a progressive change in the species in an ecological community over time.
This can happen after some disturbance such as a fire, earthquake, or volcanic eruption. It can mean that a e can return to the state it was before the event.
This condensation reaction is similar to that in which a peptide bond is formed between two amino acids (Chapter 3). Thus a single nucleic acid strand is a phosphate-pentose polymer (a polyester) with purine and pyrimidine bases as side groups. The links between the nucleotides are called phosphodiester bonds
Answer:
Alleles are recombined when gametes from different parents join together.
Explanation:
Genetic variation is increased by sexual reproduction in 3 main ways
1. Random mating - individual organisms reproduce with each other at random, meaning new combinations of DNA come together when fertilization occurs
2. Crossing over - during meiosis, when homologous chromosomes align, they can exchange genetic material by a process called crossing over, or homologous recombination. This means the alleles on each homologous chromosome are reshuffled, creating new combinations.
3. Independent assortment - When gametes are formed, a diploid cell duplicates its DNA and forms 4 haploid cells. Each of the homologous pair of chromosomes in the diploid align in the centre of the cell to be split into the gametes at each division. The orientation at which they line up is random, so every gamete gets a different selection of chromosomes (which themselves have been shuffled bt crossing over).
Only the 1st option (Alleles are recombined when gametes from different parents join together.) is correct. This represents the process of random mating, where new combinations of alleles are formed during fertilization between two individuals.
