A random change in allele frequencies over time due to chance is termed "________"
a. natural selection
b. a bottleneck
c. genetic drift
d. gene flow
c
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A vertebrate paleontologist is hunting through chalk deposits and finds a set of fused clavicles with some other bone fragments. What has she found?
A. The remains of an amphibian. B. The remains of a lobe-finned fish. C. The remains of a bird. D. The remains of a mammal. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about bird adaptations? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
As the polypeptide is elongating in translation,
what is the ribosome doing?
a. removing incorrectly added amino acids. b. moving along the mRNA transcript bonding amino acids to each other. c. travelling back and forth between the nucleus and the growing polypeptide with information on which amino acids to add. d. removing the non-coding introns. e. doing more than one of these functions
Which of the following does not characterize arthropods?
A. presence of a coelom B. segmentation C. an open circulatory system D. an exoskeleton E. an incomplete digestive tract
Which of the following may result in anemia?
a. a deficiency of iron b. a deficiency of iodine c. a deficiency of chlorine d. a deficiency of calcium