The two cells that result from a single cell need to have the same amount of genetic material as the initial cell, therefore the DNA needs to be duplicated before the cell divides.
The sister chromatids are attached together so that during anaphase the daugther cells will receive the same chromosomes
The water enters the xylem first by osmosis. Water moves from the soil to the root hair cell down a water potential gradient, and to the root cortex cell from a higher water potential to a lower water potential, this process will be repeated until water enters xylem. Because transpiration is occurring in the leaf, water is lost so there is a lower water potential inside the leaf. Osmosis moves water from the xylem to the leaf because the xylem has a higher water potential. Water moves from the xylem to the cells of the leaf. This pulls water up the xylem via cohesion which is the process of water molecules attracting each other and sticking together. Water does not fall down the xylem as here is adhesion which is the process of water molecules sticking to the inside of the xylem.
“Two species of crickets, Gryllus rubens and
Gryllus texensis, have different courtship songs which can be identified only
by the opposite sex of their own species” is an example of behavioral isolation.
Behavioral
isolation is an
important evolutionary mechanism that helps members of the same species
identify each other as proper mates.
The correct answer between all
the choices given is the third choice or letter C. I am hoping that this answer
has satisfied your query and it will be able to help you in your endeavor, and
if you would like, feel free to ask another question.
Answer:
339
Explanation:
the FCI recognizes 339 breeds of dogs which are divided into 10 groups based on the dog’s purpose or function or on its appearance or size. The 10 groups are:
Sheepdogs and Cattle Dogs, other than Swiss Cattle Dogs (this group includes most of the dogs found classified as "herding dogs" by other kennel clubs).
Pinscher and Schnauzer, Molossoid Breeds, Swiss Mountain and Cattle Dogs and Other Breeds (the Molossian breeds include the dogs known as the mastiffs by most other kennel clubs)
Terriers
Dachshunds
Spitz and Primitive Types
Scent hounds and Related Breeds
Pointers and Setters
Retrievers, Flushing Dogs, Water Dogs
Companion and Toy Dogs
Sighthounds
Proteins are made up of amino acids not ribosomes.
