Active transport ________.

utilizes energy
cannot transport molecules against a concentration gradient
cannot be saturated
requires cofactors


utilizes energy

Biology & Microbiology

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The lumen of a transverse tubule is occupied by

A. extracellular fluid. B. cytoplasm. C. actin. D. myosin. E. sarcomeres.

Biology & Microbiology

The modern evolutionary synthesis of the 1930s and 1940s melded together Darwin's findings with ________.

A. chemistry B. psychology C. genetics D. sociology

Biology & Microbiology

A population grows exponentially when

A) the death rate equals the birth rate and immigration is equal to emigration. B) the carrying capacity is exceeded. C) emigration exceeds immigration and the birth rate equals the death rate. D) the birth rate and the death rate are equal. E) the birth rate exceeds the death rate and immigration exceeds emigration.

Biology & Microbiology

How many tissue layers are in the embryos of sponges?

A) None B) One C) Two D) Three E) Four

Biology & Microbiology