When is energy needed to move substances across the cell membrane

Which body System communicates with all body systems and reacts to the environment?

How many alleles does a baby guinea pig inherit from the mother?

A few characteristics of a type of reproduction are shown below: 1. Involves two organisms 2. Gametes are not produced 3. Cell divides only by mitosis 4. Offspring show genetic variation 5.

Suppose a fungus destroys the central xylem and phloem tissues in the roots of a tree. What function of the root system will be lost because of this damage

Which type of current occurs when the oceans surface water becomes denser than the water below it and sinks

Which of these is NOT a way that large molecules, like glucose, can enter a cell? A) diffusion through the cell membrane. B) facilitated diffusion through protein channels in the cell membrane.

The specialized functions of different membranes are largely determined by the blank they contain. Membrane lipids are blank molecules, composed of a hydrophilic portion and a hydrophobic portion.

Which of the following aren't eukaryotes? plants bacteria animals fungi

In pea plants, smooth pea shape is dominant to wrinkled pea shape. If a pea plant that is true-breeding for smooth pea shape is crossed with a pea plant that is true-breeding for wrinkled pea shape, what will be true of the offspring?

Are atoms completely lost or gain in a chemical re