_52. Why are enzymes essential to organisms?
a. They are catalysts for biochemical reactions in cells
b. They provide short term and long-term energy for the cells
c. They provide instructions for protein synthesis and determine traits
d. They create semipermeable barriers in the cell that separates the inside and outside of the cell.

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.

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

Which of the following would most directly interfere with sperm production? ingestion of a substance that mimicked inhibin interruption of sustentocytes' production of abp low sperm count use of synthetic steroids (testosterone)