Which chordate has a four-chambered heart, no bladder, no teeth, and lack of a penis in the males?
a. a bird
b. a crocodile
c. a bat
d. a frog
e. a shark
ANSWER: a
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Which structure or compartment is part of the symplast?
A) the interior of a vessel element B) the interior of a sieve tube C) the cell wall of a mesophyll cell D) an extracellular air space E) the cell wall of a root hair
Riftia tube worms make a unique kind of hemoglobin to
A. to assist in the transport of carbon dioxide. B. transport oxygen. C. transport hydrogen sulfide. D. All of the choices are correct.
Which of these statements is true?
a. Environment can readily alter some genotypes. b. Genotype is manifested in phenotype. c. Genetic variation is easier seen than phenotypic variation. d. Variation dies with individuals. e. Phenotype is seen physically in the genotype.
Which statement regarding steroid hormones is false?
A) They regulate sexual development. B) They influence mood. C) They are important components of animal cell membranes. D) They stimulate egg production in females. E) They are modified cholesterol molecules.