Squids are examples of ____
a. cephalopods
b. pseudopods
c. monopods
d. gastropods
e. polypods
ANSWER: a
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One double-stranded DNA molecule combined with proteins form ____________________, which is visible as clumps or threads in the cell nucleus
Fill in the blank(s) with correct word
Answer the following statements true (T) or false (F)
1. Heterotrophs must acquire carbon from organic molecules produced from other organisms. 2. An organism to which oxygen is toxic is an obligate anaerobe. 3. Because Archaea were first found in environments that lacked oxygen or were very hot, acidic, or salty, they were nicknamed "extremophiles." 4. The main difference between gram-positive bacteria and gram-negative bacteria is in the structure of their cell membranes. 5. Many prokaryotes play vital roles in global nutrient cycles.
The arrows in the above figure point to
a. stomata. b. companion cells. c. guard cells. d. perforated end plates of sieve tubes. e. none of these.
Water flows over gills in the opposite direction of blood flow in a process known as
A) inhalation. B) respiration. C) diffusion. D) countercurrent exchange.