Bio 108 Text Assignment #3 Levetin.  Due at the time of Exam 3.  10 points

Name____________________________

Ch. 26  p. 478 Deserts

1. What are biomes?

2.  Which biome develops in an area is largely determined by two factors of climate, __________________  and _______________________.

3.  Desert biomes develop when yearly rain is below _________________inches.

4. Fig. 26.13a shows that the low deserts of the American Southwestare dominated by _____________________  .

5. The Great Basin desert is an example of a _______________desert.  It forms because rain clouds do not cross over the __________________.

6. Desert soils are nutrient poor because without moisture, there is no degradation (break down) of _________________________.

7. Plants that have adapted to the dry desert are called ____________________.

8.  List 3 strategies or adaptations plants use to survive in the desert:

9. Figure 26.11 explains why there is so much of a difference in plant and animal life between Phoenix and Flagstaff.  Explain what this figure is illustrating.

Ch. 2: Cells

1. All plants and animals are built of _________________.

2.  Figure 2.2 shows a microscope built by Robert __________________________ in the 1600's.  He looked at cork and thought the structure looked like the rooms monks slept in called "cells".

3.  The ____________  ________________encloses all parts of the plant cell. 

4. The outermost membrane in a cell is the ______________________ membrane.  This is shown in fig. 2.5 and regulates what moves in and out of the cell.

5.  Fig. 2.2 and 2.3 shows a variety of structures called organelles in the plant cell.  Photosynthesis occurs in the ___________________________.

6. Fig. 2.7 shows the starch grains in potato are in the ___________________________.

7.  Cellular respiration occurs in the  __________________________.  It is the site of energy production in cells.

8.  In many plant cells, 90% of the cell volume is taken up by the central _______________________.  This is a storage area for waste products.

9.  The organelle that controls the cell and contains hereditary information is the ___________________________.

10.  Box 2.1 mentions that the first cells on Earth were _______________________.  Chloroplasts and mitochondria are found in  _________________cells.

11. Give 3 pieces of evidence that suggest chloroplasts and mitochondria are descended from free-living prokaryotic cells. (box 2.1).

    a.

    b.

   c.

Ch. 1: Chemistry  p. 8-18

1. All matter is composed of __________________, 92 which occur naturally.

2.  The six elements that make up 99% of life are shown in fig. 1.5.  List them below.

3.  The smallest part of an element that retains its characteristics is an _____________________________.

4.  Atoms are made of 3 sub-atomic particles called ______________________, _______________________, and ______________________.

5.  Protons carry a _______________________charge.  Electrons carry a ____________________ charge.  Unlike charges ___________________each other.

6.  The atomic number tells you which element you have.  It is the number of ___________________________.

7.  The atomic mass is calculated by adding the number of _____________________ and ____________________.

8.  When atoms combine with like or different atoms, they are called _________________________.

9.  When molecules are made of two or more kinds of atoms, they are called _________________________.

10. Water, fig. 1.8, is a compound of 2 _____________ and 1 ____________________.  Adjacent H₂O molecules are held together by ________________bonds.

Molecules of Life p. 11

11. Carbohydrates are made of these 3 atoms:

12. Polysaccharides are thousands of sugar molecules long.  Examples (fig. 1.9) are ___________________  and ____________________.

13.Proteins are built of     ______________________    acids.

14.  Lipids are ___________________ in water.

15. The hereditary material of life is the nucleic acid,  ____________________.

16.  In Box 1.2 on p. 10, they discuss plants as chemical factories.  List 3 classes of compounds produced by plants and their use by humans.