When the optic vesicle contacts overlying ectoderm, developmental events are induced, leading to ____ in the
developing lens.
a. crystallin and keratin synthesis
b. crystallin synthesis
c. keratin synthesis
d. degradation of crystalline and keratin
e. apoptosis
ANSWER: b
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The leading strand is the daughter strand that has its ____ end pointed toward the replication fork and is therefore synthesized ______
A. 3'; in a series of segments B. 3'; continuously C. 5'; in a series of segments D. 5'; continuously E. None of the answer options are correct.
Plasmids are distinguished from bacterial chromosomes in that
A. plasmids are circular, bacterial chromosomes are linear. B. plasmids occur in the cytoplasm, bacterial chromosomes occur in the nucleus. C. plasmids are composed of RNA, bacterial chromosomes are composed of DNA. D. plasmids have few genes, bacterial chromosomes have many genes. E. plasmids consist of single-stranded nucleic acids, bacterial chromosomes consist of double-stranded nucleic acids.
The reading frame for translation is established by ____
a. removal of the cap from mRNA b. pairing of initiator tRNA with the start codon c. the first base in the mRNA molecule d. the ribosome binding site e. the poly(A) tail
Deep-diving animals accomplish their dives through ____
a. speeding their heart rate b. swimming vigorously c. storing oxygen in muscles and blood d. binding oxygen to hemocyanin e. going into a deep sleep