Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?
A) PDGF
B) MPF
C) cyclin
D) Cdk
B
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Match the feature of protein synthesis that best matches.
A) neither prokaryotic nor eukaryotic protein synthesis B) prokaryotic protein synthesis C) eukaryotic protein synthesis D) both prokaryotic and eukaryotic protein synthesis 1) AUG is the start codon 2) the initial amino acid is N-formylated 3) requires the presence of eIFs for translational initiation 4) peptide bond formation catalyzed by an RNA molecule 5) presence of Shine–Delgarno sequence 6) mRNA is translated 3' ? 5'
Sclereids are found in
a. root tips. b. seed coats. c. mesophyll cells that produce food. d. cortex cells that store food. e. epidermal cells
Four of the following features are important evolutionary advancements in the evolution of the tree-dwelling primates. Which one is the exception?
A. Grasping hands and feet B. Depth perception C. Well-developed sense of smell D. The ability to see in 3D E. A large brain relative to body size
The monomer subunit of immunoglobulin molecules has all the following, except
A. two identical light polypeptide chains. B. two identical heavy polypeptide chains. C. four antigen binding sites. D. disulfide bonds between polypeptide chains. E. a variable and constant region on each polypeptide chain.