James is making models of plant and animal cells using objects supplied by his teacher to represent organelles. for one cell, he will place the objects in a shoebox. first he fills a balloon with water and places it in the shoe box. he also drops a handful of marbles into the box. which statement most likely describes the structures he has represented so far? he is making an animal cell. the box is the cell membrane, and the balloon represents the large vacuole. the marbles are the endoplasmic reticulum. he is making a plant cell. the box is the cell wall, and the balloon represents the large vacuole. the marbles are the tiny ribosomes. he is making a plant cell. the box is the cell wall, and the balloon represents the nucleus. the marbles are the centrioles. he could be making either a plant or animal cell. the box is the cell wall, and the balloon represents the large vacuole. the marbles are the centrioles.

James is making models of plant and animal cells using objects supplied by his teacher to represent organelles. For one cell, he will place the objects in a shoebox. First he fills a balloon with water and places it in the shoe box. He also drops a handful of marbles into the box. He is making a plant cell. The items represent the cell wall, vacuole and ribosomes. The box is the cell wall, and the balloon represents the large vacuole. The marbles are the tiny ribosomes.

Answer is, he is making a plant cell.The box is the cell wall, and the balloon represents the large vacuole. The marbles are the tiny ribosomes.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.