Microtubules have an inner diameter of ________ and an outer diameter of ________.

A) 15 mm; 25 mm
B) 8 nm; 12 nm
C) 25 nm; 30 nm
D) 15 nm; 25 nm
E) 7 mm; 14 mm


D) 15 nm; 25 nm

Biology & Microbiology

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In the cultivation of microaerophilic and anaerobic bacteria,

A. a(n) candle/anaerobe jar is sufficient. B. atmospheric oxygen in a(n) candle/anaerobe jar is converted to water. C. a packet containing chemicals that generate carbon dioxide and hydrogen is used in a(n) candle/anaerobic jar. D. oxidizing agents are incorporated into the media that react with oxygen.

Biology & Microbiology

A plant embryo (young sporophyte) packaged with a food supply in a tough outer coat is a:

a. Gemmae b. Pollen grain c. Seed d. Sperm e. Fruit

Biology & Microbiology

An injection of ACTH would cause an increase in the release of which of the following hormones?

A) antidiuretic hormone B) growth hormone C) thyroxin D) glucocorticoids

Biology & Microbiology

Which of the following is a by-product of the catabolism of proteins?

A. lactic acid B. acetyl-CoA C. proteases D. ammonia E. carbon dioxide

Biology & Microbiology