The vertebrate fish group that most likely gave rise to the tetrapods are the:

a. ray-finned fishes
b. cartilaginous fishes
c. hagfishes
d. lampreys
e. lobe-finned fishes


e

Biology & Microbiology

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Which of the following cell structures are present in sieve elements, but not in mature vessel elements? Choose all that apply

A. nucleus B. mitochondria C. cell wall D. cytoplasm E. smooth endoplasmic reticulum

Biology & Microbiology

Answer the following statements true (T) or false (F)

1. Dehydration synthesis reactions always involve the removal of a molecule of water. 2. The biosynthesis of polysaccharides, polypeptides, and nucleic acids are examples of catabolic reactions. 3. Oxidation–reduction reactions are paired reactions that involve the transfer of electrons. 4. Breaking a disaccharide down into its two monosaccharide components is an example of a hydrolysis reaction. 5. Anabolic reactions are a cell's major source of energy.

Biology & Microbiology

Dietary treatment of galactosemia ____

a. need not begin until one or two months after birth b. consists of very low protein intake c. can usually be discontinued by the age of twelve d. completely eliminates symptoms of the disease e. should be started within a few days after birth

Biology & Microbiology

Physiological saline is 0.9 percent NaCl; red blood cells placed in such a solution will not gain or lose

water; therefore, one could state that the fluid in red blood cells is hypertonic.

Indicate whether the statement is true or false.

Biology & Microbiology