Which structures return blood to the heart?
A) capillaries
B) veins
C) arteries
D) sinoatrial nodes
B
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Refer to the figure above. The mRNA is smaller than the length of the DNA that codes for it because _____
A) the regulatory regions (exons) of the gene are not transcribed B) post-transcriptional modification removes the introns C) post-transcriptional modification removes the exons D) bases are added to the tail of the primary transcript
The number of linkage groups in an organism with sex chromosomes equals:
A. 1n B. 2n +1 C. 1n + 1 D. 2n + 2
In a hypertonic environment, an animal cell will do which if the following?
a. swell b. stay the same size c. shrink d. cannot be determined
Early microscopes did not allow clear visualization of cells because they were limited by
A) magnification. B) number of kernels. C) resolution. D) refraction. E) both magnification and resolution.