The information storage molecules of cells are called
A. phospholipids.
B. nucleic acids.
C. proteins.
D. hormones.
E. enzymes.
Answer: B
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When the direct method of measuring mutation rates is used, estimates are made for a specific ____________________ over a number of ____________________
Fill in the blank(s) with correct word
Which of the following groups of species represents a guild?
A) species of birds that feed on nectar B) species of plants that use the C3 pathway of photosynthesis C) species of plants that tolerate shade D) species of plants or animals that are iteroparous
Which of the following statements about the protonephridia of freshwater flatworms is correct?
A. Fluid from the body enters the protonephridia without first being filtered. B. Protonephridia are surrounded by a capillary network to allow for selective reabsorption and secretion. C. The urine leaving the body of a freshwater flatworm is more concentrated than its body fluids. D. Muscular contractions drive fluid movement through the excretory tubules. E. The fluid passing through the tubules is not modified prior to excretion.
The site of formation of pollen grains is in the
a) receptacle. b) stamen. c) sepal. d) carpel. e) petal.