The movement of substances across a cell membrane from an area of lower concentration to an area of higher concentration, which requires cellular energy & a carrier protein is called:

Which of the fayum primates may be linked to the platyrrhines as evidenced by the presence of three premolars?

What is the female gamete of a plant

Transcription factors need to have an attraction to DNA in order to stay near or on the DNA the majority of the time. If transcription factors were not attracted to DNA they may float off the DNA and diffuse away.

In general, white dwarfs are ___ and ___ than giant stars. A) hotter; less luminous B) cooler; less luminous C) hotter; more luminous D) cooler; more luminous

Which one of the following is NOT a cause of acid precipitation? a. sulfur dioxide from burning coal b. nitrogen oxides from car exhaust c. destruction of the ozone layer

How many Earth years would you need to live in order to be two on Neptune?

A characteristic of acids is that they react with metals to: form non-metals release water release hydrogen gas produce bases

Which of the following elements has the largest atomic radius? Silicon Aluminum Sulfur Phosphorous

Describe Basket Cells?

Energy flows from the producer level to the