The material which provides rigidity to cell walls is called

A) phospholipids

B) lipids

C) cellulose

The goat has body cells containing 30 chromosomes. Assume that one germ cell of a male goat undergoes meiosis and produces four sperm cells. Which of the following words does NOT describe each sperm cell? A. haploid B. zygote C. gamete D.

Provide at least two examples of the opposite effects of the sympathetic and parasympathetic divisions of the nervous system.

Overall, membranes seem to have a great deal in common, but on closer inspection it is revealed that membranes of different cells have unique properties. What is the primary component of membranes that gives membranes cell-specific properties?

Many renewable energy sources are intermittent. What does this mean, and why does it pose a challenge to the use of these sources for electrical power generation

The ossicles are the three smallest bones in the human body.

Proteins can perform many different functions in living cells. One major function-acting as a catalyst for chemical reactions-can also be performed by what other kind of organic molecule? A.) cholesterol B.) phospholipids C.) glycogen D.) RNA

Blank interactions occur between individuals of the same species

Explain the main functions of the roots

TRUE or FALSE. | Because Jupiter is more massive than Earth, a ball dropped there would take longer to hit the ground.

Only 10 percent of the energy stored in an organism can be passed on to the next trophic level. Of the remaining energy, some is used for the organism's life process, and the rest is ...