Which cell structure is referred to as the gatekeeper because it directs substances to move into and out of the cell? a cell wall b nucleus c vacuole d cell membrane?

PKU and albinism are two autosomal recessive disorders, unlinked in human beings. if couple each of them heterozygous for both traits, produce a child, what is the chance of their having a child with (a) PKU (b) albinism (c) both traits?

Extreme pressure and temperature can change sedimentary rock into

A female primate has a better chance of feeding herself and her young when: a. she can easily find mature trees and grasses. b. all of the above. c. large patches of fruit-bearing trees dot the landscape. d. she lives in a temperate climate.

Cellular Respiration (there is more than one correct answer) a. produces oxygen b. uses carbon dioxide c. uses glucose d. produces carbon dioxide

Which of the following rely directly on the brazil nut as a source of food? a. toads b. mosquitoes c. agouti d. poison frogs

Can energy be transferred from animal to animal

The more stomata the more water loss?

Why does it take a long time to develop a new variety of tomato? A. Changes in traits happen gradually, over many generations. B. Many plants resist change. C. Tomatoes cannot acquire new traits. D. A species cannot change over time.

Select the one true statement. Vacuoles store nutrients, water, and waste in animal cells. Plant cells can have chloroplasts but do not have a cell wall.

Using water more effectively A. Protects the environment B. Causes the loss of natural pollution filters C. Increases with contamination D. All of the above