The mammalian zona pellucida is structurally and functionally most similar to which one of the following structures in a sea urchin egg?
A) the cortical granules
B) the jelly layer (coat)
C) the vitelline envelope
D) the plasma membrane
Answer: C
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Based on his monohybrid crosses, Mendel's proposed which of the following? Check all that apply.
_____ Alternative forms of a trait are encoded by alternative alleles. _____ The 2 alleles for a given trait separate when gametes form. _____ Each allele has an equal probability of being passed on to the gametes. _____ Allele pairs segregate independently of each other. _____ Diploid individuals have 2 alleles for each trait.
You are taking a lab practical exam. One station has a microscope slide of a cross section through an artery and vein. Which vessel is the artery?
A. the vessel with more muscle tissue and elastic fibers in its wall B. the vessel with valves to prevent backflow C. the vessel lined only with endothelium D. the vessel with a greater overall diameter E. the vessel with the wider lumen (e.g., interior space that contains the blood)
What is a bulb?
a. a short section of underground stem encased by overlapping layers of scales b. a short, thickened underground stem that contains nodes c. a flattened, photosynthetic stem specialized to store water d. a fleshy stem that typically grows under the soil and parallel to its surface e. a stems that branches from a plant’s main stem and grows horizontally on the ground
Pcr
1.is a way of replicating DNA without using a cell. 2.uses two primers. 3.can produce large amounts of DNA very quickly. 4.avoids the use of vectors. 5.All of the options are correct.