Which of the following animals displays radial symmetry?
A) an earthworm
B) a sea anemone
C) a fish
D) a lobster
Answer: B
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As scientists were unraveling the mysteries associated with transcription and translation in eukaryotes, they discovered there was not a one-to-one correspondence between the nucleotide sequence of a gene and the base sequence of the mRNA it codes for
They proposed the genes-in-pieces hypothesis. How can the genes-in-pieces hypothesis be explained? A) Introns are noncoding segments of DNA that are present in the initial transcript, but are removed by splicing. B) Introns are noncoding segments of DNA that are not read or transcribed by RNA polymerase II. C) Exons are noncoding segments of DNA that are not read or transcribed by RNA polymerase II. D) Exons are noncoding segments of DNA that are present in the initial transcript, but are removed by splicing.
Complex multicellularity in plants and animals evolved independently. Which of the following features would you expect to be different between plants and animals because of their independent evolution of complex multicellularity?
A. The mechanism by which plants and animals obtain energy would be expected to be different because of the different origin of multicellularity. B. Cell-cell adhesion molecules would be different in animals and plants. C. Plants would have cell walls, but animal cells would not. D. A significant difference in size between the two groups of multicellular organisms would be expected.
The presence of ________ in the microenvironment of cancer cells acts a potent inhibitor of cell proliferation.
A) IL-1 B) TGF-beta C) TNF-alpha D) IL-2 E) INF-gamma
Cellular structures that function in movement and consist of numerous short hairlike extensions from the cell are called ________
Fill in the blank(s) with correct word