Which of the following membrane-enclosed organelles is the site of synthesis of membrane proteins and secretory proteins?
a) rough endoplasmic reticulum
b) smooth endoplasmic reticulum
c) nucleus
d) centrosome
e) golgi complex

What do science, technology, and disease have to do with each other?

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen