Air is continuously forced through tubes that thread through vascularized tissue in a pair of inelastic lungs in _____

a. some fish
b. amphibians
c. birds
d. reptiles
e. some small mammals


ANSWER: c

Biology & Microbiology

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The ancestors of modern ________ performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.

A. Firmicutes B. Proteobacteria C. Cyanobacteria D. Crenarchaeota

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You have recently identified a molecule you believe to be a signal molecule associated with signal

transduction. All you know about this signal molecule is that chemically it is hydrophilic. As a result you expect it to interact with ____.

a. a receptor on the cell surface b. a receptor within the cytoplasm of the cell c. a receptor in the nucleus of the cell d. a receptor on the cytoplasmic surface of the plasma membrane e. a receptor associated with the endoplasmic reticulum

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What term is used to describe the situation when the loss of an allele because of selection against one of its phenotypes is balanced by natural selection in favor of the allele for another phenotype?

A) equilibrium frequency B) heterozygote fitness C) restriction fragment length polymorphism D) single nucleotide polymorphism E) balanced polymorphism

Biology & Microbiology

Exocrine glands:a

have a duct. b. cannot secrete mucus. c. are made of endothelial tissue. d. secrete hormones. e. transport products through interstitial fluid.

Biology & Microbiology