Cells are _____
A) only found in pairs, because single cells cannot exist independently
B) limited in size to 200 and 500 micrometers in diameter
C) characteristic of eukaryotic but not prokaryotic organisms
D) characteristic of prokaryotic and eukaryotic organisms
D
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What are ecological reservoirs?
A. Nonliving components of ecosystems that require a constant input of chemicals B. Nonliving components of ecosystems where chemicals accumulate C. Living components of ecosystems that accumulate chemicals D. Living components of ecosystems that cycle chemicals
Which of the following is a change to the nucleotides in a segment of DNA that codes for a protein?
a. Proto-oncogenes b. Tumor suppressor genes c. Gene mutations d. Negative regulators
The stomach____
a. is a non-elastic sac b. secretes enzymes that begin to break down fats c. secretes enzymes that begin to break down proteins d. is surrounded by three layers of skeletal muscle
e. secretes enzymes that begin mechanical digestionThe organ responsible for excretion of both
urine and feces indicated by the letter"F" is called the a. mouth. b. crop. c. gizzard. d. secreting portion of stomach. e. cloaca