Phloem transport is described as being from source to sink. Which of the following would most accurately complete this statement
about phloem transport as applied to most plants in the late spring? Phloem transports ________ from the ________ source to the ________ sink. A) amino acids; root; mycorrhizae
B) sugars; leaf; apical meristem
C) nucleic acids; flower; root
D) proteins; root; leaf
E) sugars; stem; root
Phloem is one of the vascular tissues and is mainly involved in the transport of sugars. Phloem sap is the aqueous solution that moves through sieve tubes of phloem. Phloem sap mainly consists of sugars but also carries amino acids, hormones, and minerals. Sucrose is the most prevalent sugar.
Phloem sap moves from sites of sugar production (called sugar sources) to sites of sugar use or storage (called sugar sinks). A sugar sink is an organ that either uses the sugars for energy production and other functions or stores it.
In late spring, the fully grown leaves serve as a source of sugars. Apical meristem is responsible for the growth of stem and root length and serves as a sugar source as it obtains sugars from the leaves and uses them during the growth of shoot and roots.
B) sugars; leaf; apical meristem is the correct answer.
Explanation:
Phloem transports sugars from the leaf source to the apical meristem sink.
Phloem is a living system that carries and transports the food prepared in the leaves to all parts of the plant.
Phloem cells are found outside xylem.
Phloem is comprised of
companion cells
sieve cells.
phloem fibers
phloem parenchyma cells
Phloem transfers food everywhere the plant by this way:
It performs this by a series of tubes that join source tissues to the sinks tissues.
The food prepared in the leaves is loaded in the sieve tubes of the phloem and the high pressure produced in the phloem transfer the food to all parts of the plant. Thus mechanism through which sugars are carried is called pressure flow.
The building blocks of proteins are known as amino acids. These acids are not only the building blocks of proteins--they are also important in many other chemical and biological processes.
The answer would be - It untwists the double helix and separates the two DNA strands. A helicase is an enzyme used to separate strands of a DNA double helix by breaking hydrogen bonds between annealed nucleotide bases.
Mitosis is the process when a parent cell is divided, and two daughter cells are found after the process. This question says that when the parent cell is split, two daughter cells are the result. This is mitosis, so the answer is D.
