Which is a form of active transport?

Proteins create openings on another side of the cell membrane.

Proteins open up channels in the cell membrane.

Proteins enter and exit the cell freely.

Proteins push molecules through the cell membrane.

All cells are surrounded by a membrane. which is a characteristic of a cell membrane

Explain the criteria for categorizing phenomena as science (Consistent, Observable, Natural, Predictable, Testable, and Tentative).

When a mouth develops from the first opening in the gastrula, the organism is called a deuterostome T or F

The membrane voltage level at which an action potential is triggered is termed the

Which of the choices below describes the ANS? A) motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands B) motor fibers that conduct nerve impulses from the CNS to skeletal muscles C) sensory neurons that

Which of the following is a biotic factor? a. Parasites b. Sun c. Soil d. Temperature

When nucleotide sequence of the cell's DNA becomes altered it causes what

Factors that can alter the level of expression of a gene include Check All That Apply an increase in l temperature. an increase in salinity. exposure to UV radiation. presence of particular energy substrate.

What did Virchow observe that led him to determine one of the main components of cell theory?

Discuss the social and biological construction of race in the United states.