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
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You have been advised to check your pulse during exercise in order to monitor your heart rate. What is happening in your heart as your pulse is produced?
A) ventricular diastole B) atrial diastole C) the aortic valve and pulmonary valves are closing D) ventricular systole E) atrial systole
Double fertilization occurs when
A. the sperm and tube nuclei fertilize the egg. B. one sperm fuses with the egg and the other sperm fuses with both polar nuclei. C. the polar nuclei fuse with the egg after it has fused with the sperm. D. two sperm cells fertilize the two polar nuclei.
The primary structure of a protein is determined by ________
A) the sequence of amino acids B) a series of helical domains C) hydrogen bonds formed between the components of the peptide linkage D) pleated sheets E) covalent bonds formed between fibroin residues
Given the following cladogram and list of characteristics:
MossFernConiferFlowering PlantChlorophyll a & bYesYesYesYesVascular tissueNoYesYesYesSeedsNoNoYesYesFlowersNoNoNoYes Based on what you know about the principle of parsimony, which of the following is most likely a synapomorphy of conifers and flowering plants?
A. Flowers. B. Chlorophylls a and b C. Seeds. D. Both chlorophylls a and b and seeds. E. Vascular tissue.