Scientists are now grouping reptiles with birds and mammals because they are all vertebrates that have a(n):
a. divided brain.
b. amniotic egg.
c. mammary gland.
d. jointed appendage.
e. epidermal covering.
b
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A particular flower can be purple, blue, red, or white. A pure-breeding purple plant is crossed with a pure-breeding white plant and the F1 are then crossed to produce an F2 generation. Which phenotypic ratio in the F2 may indicate that flower color in these plants is controlled by two genes that interact additively?
A) 3:1 B) 1:2:1 C) 9:3:3:1 D) 9:3:4 E) 15:1
Given the following components of the cardiac conduction cycle, which one of the following best describes the movement of the stimulus that causes a heart contraction? A. atrioventricular bundle B. sinoatrial node C. atria D
atrioventricular node E. Purkinje fibers F. ventricles A) B, C, D, A, E, F B) B, D, A, C, E, F C) D, A, E, F, B, C D) A, D, E, B, C, F E) B, C, D, F, A, E
The property of a test to detect even small amounts of antibodies or antigens that are test targets is ________.
A. cross-reaction B. precipitation C. specificity D. agglutination E. sensitivity
Answer the following questions true (T) or false (F)
1. Root hairs develop into taproots. 2. Stomata allow carbon dioxide into a leaf and water vapor out. 3. Most stomata are found on the top surface of a leaf.