Which of the following is least likely to be preserved as a fossil?
A. an organ like an eye or lung
B. a bone or shell
C. an organism that died on land
D. a complete large organism
E. a leaf or stem
A. an organ like an eye or lung
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What cytoskeletal protein is important to the function of the sperm cells illustrated in Figure 11.13?
A. microfilaments B. intermediate filaments C. microtubules D. All of the above are correct.
In which of the following taxa does the mature sporophyte depend completely on the gametophyte for nutrition?
A) fern B) bryophyte C) horsetail (Equisetum) D) A and C E) A, B, and C
Which of the following foods has the lowest water content?
a. Butter b. Whole grain bread c. Tomato d. Sirloin steak
Antibodies are Y-shaped molecules that have two identical binding sites. Suppose that you have obtained an antibody that is specific for the extracellular domain of an RTK. When the antibody binds to the RTK, it brings together two RTK molecules
If cells containing the RTK were exposed to the antibody, would you expect the kinase to be activated, inactivated, or unaffected? Explain your reasoning.