单选题 Export proteins are proteins destined for export from the cell or for inclusion in cell membranes. The can be identified by ______.

A、 their secondary structure

B、 a sequence of amino acids known as signal peptide

C、 their association with a polysome

D、 all of the above

E、 none of the above

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相关试题

单选题 Smooth endoplasmic reticulum (SER) ______.

A、lacks ribosomes

B、is active in fat and steroid synthesis

C、is involved in the oxidation of toxins

D、all of the above

E、none of the above

单选题 Ribosomes ______.

A、are organelles involved in protein synthesis

B、are the cell's main energy source

C、are storage sites for starch

D、are involved in the breakdown of proteins

E、store genetic information in the form of DNA

单选题 Most of the properties associated with processes of life are properties of ______.

A、the nucleus

B、DNA

C、the cytoplasm

D、endosymbionts

E、none of the above

单选题 Lysosomes contain ______.

A、hydrolytic enzymes

B、genetic material

C、stored fats

D、proteins

E、carbohydrates

单选题 Transformation of energy and storage of energy in the cell are the main function of ______.

A、ribosomes

B、microbodies

C、contractile vacuoles

D、mitochondria

E、smooth endoplasmic reticulum

单选题 Ribosomes are manufactured in ______.

A、cytoplasm

B、nucleoli

C、mitochondria

D、smooth endoplasmic reticulum

E、rough endoplasmic reticulum

单选题 In the mitochondria, enzymes involved in ATP generation are ______.

A、located within the matrix

B、located on the cristae

C、located on ribosomes in the matrix

D、dispersed throughout the cristae and matrix

E、associated with polysomes

单选题 The process of phagocytosis involves ______.

A、vacuolar engulfing of particulate matter

B、exocytosis

C、intake of water by a cell's vacuole

D、expulsion of particulate matter from a cell

E、expulsion of water from a cell