RNA processing that leads to mRNAs in which exon sequences are derived from different primary transcripts is called:
A. alternative splicing.
B. poly(A) site choice.
C. trans-splicing.
D. group I self-splicing.
C
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B and T cells become activated and divide to produce identical cells when _____
a. activated by an antigen b. major histocompatibility genes are expressed c. activated by the presence of cancerous cells d. plasma cells begin to produce and secrete antibodies e. killer T cells bind to any pathogen
Fungi are essential in industrial production of food and spirits.
Answer the following statement true (T) or false (F)
Four of the five answers below are correct statements about exoskeletons. Select the exception
a. an exoskeleton consists of noncellular secreted material. b. repeatedly producing new exoskeleton uses resources that the animal could put towards growth and reproduction. c. the exoskeleton is made of bone and cartilage. d. the exoskeleton protects the soft body tissues inside it. e. exoskeletons exist in some invertebrates.
Which of these cell types can be described as muscle cells that contract rapidly, are rich in glycogen deposits, and depend on anaerobic respiration to produce ATP?
A) slow-twitch cells B) myoglobin C) fast-twitch cells D) hemoglobin