Which of the following are not a correct match of cells and their function?
A. sieve elements: transport of sugars
B. vessel elements: transport of water
C. companion cells: protein synthesis and cell
metabolism
D. bundle sheath cells: transport of sugars
E. tracheids: transport of water
D
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ORF refers to
A. the region of a gene that serves as the promoter. B. the location of the start site of transcription. C. the region of a gene that codes for a protein or a functional RNA product. D. the region between the ribosome binding site and translation initiation codon.
________ are nonviral genetic elements that have reverse transcriptase activity.
Fill in the blank(s) with the appropriate word(s).
Which developmental stage occurs first?
a. cleavage b. fetus c. gastrula d. zygote e. blastula
Redi concluded from his experiment that
A. maggots arise from decaying meat. B. air is a "vital element" necessary for spontaneous generation. C. living things arise from other living things. D. microorganisms are present in the air.