Of the following types of molecules, which can function as both neurotransmitters and hormones?
A) glucocorticoids
B) second messengers
C) catecholamines
D) adipocytes
C
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Sister chromatids are best described as two DNA molecules that have ______________
A. the same genes in the same order but that have different alleles. B. the same alleles of the same genes in a different order. C. different genes in the same order and possibly have different alleles of some genes. D. different alleles of the same genes arranged in a different order. E. virtually identical sequences of nucleotides.
Under what environmental conditions would it be MOST advantageous for the photoautotrophic dinoflagellate Peridinium limbatum to reproduce asexually?
A. Increasing concentrations of nitrogen and phosphorus caused by fertilizer runoff B. Fluctuating seasonal water temperatures C. Increasing water acidity levels caused by rising concentrations of atmospheric carbon dioxide D. Decreasing light availability caused by an increase in suspended particles
Passage through the cell cycle is controlled by heterodimeric protein kinases.
a. true b. false
The portal vein transports venous blood from the gastrointestinal tract directly to the:
A) liver. B) colon. C) spleen. D) gallbladder.