Thin filaments and thick filaments are made of proteins. Of which of the following proteins are thin filaments composed?

a. myosin
b. lectin
c. actin
d. keratin


c. actin

Biology & Microbiology

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In which cells do erasure and re-establishment of imprinting marks typically NOT occur?

A. Nurse cells B. Sperm cells C. Oocytes D. Somatic cells

Biology & Microbiology

A key step in the evolution of vascular plants was the ability to produce __________, a strengthening

polymer in the walls of cells that function in support and conduction. a. lignin b. cellulose c. starch d. fructose e. cutin

Biology & Microbiology

Cells that secrete large amounts of glycoprotein have many Golgi stacks

__________________ Indicate whether the statement is true or false.

Biology & Microbiology

Which of the following molecules could be secreted from a eukaryotic cell?

a. ions b. metals c. water d. carbohydrates

Biology & Microbiology