What is the major protein in the myofilament that is composed of two intertwined strands?

Thylakoids exist in stacks inside the thylakoid lumen. What is the term for these stacks?

a. chloroplast b. stroma c. granum d. mesophyll

The "geo" in biogeochemical refers to _____ - specifically, to the abiotic reservoirs where a chemical element can be found.

Fill in the blank(s) with the appropriate word(s).

The genetic code was originally deciphered, in part, by experiments in which synthetic polynucleotides with repeating sequences were used as mRNAs to direct protein synthesis in cell-free extracts. Under these conditions, ribosomes could be made to start translation anywhere within the RNA molecules, with no start codon necessary. What peptide would be made by translation from a synthetic mRNA made of the repeating dinucleotide CGCG...?

A. a polymer of alanine: Ala-Ala-Ala... B. a polymer of arginine: Arg-Arg-Arg... C. the peptide Met-Arg-Ala-Arg-Ala... D. a peptide containing alternating arginines and alanines E. a polymer of arginine plus a polymer of alanine

Because of its association with tools, the earliest human was called ________ meaning "handy man."

A. Cro-Magnon B. Homo sapiens C. Homo habilis D. Neanderthal E. Homo erectus